⚡ Curated by Dr Scalpel • Intensive Practical Exam Study Notes • 4th Year Summer Internship

Surgical Internship Practical Exam Master Guide

Complete syllabus-aligned revision guide for the UCSMT Surgery OSCE Practical Exam. Covers all 5 stations: Dressings & Sutures, Manipulations & Tubes, Imaging & Endoscopic Interpretation, Laboratory & Paraclinical Diagnostics, and Standardized Patient Clinical Examination with step-by-step diagnostic reasoning.

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5 Sections

OSCE Curriculum

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12 Cases

Diagnostic Simulator

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12 Imaging

X-Ray, CT, USG, Endo

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30+ Signs

Surgical Eponyms

Protocol

OSCE Exam Structure & Scoring System

🎯 5 Evaluation Sections

2 Pts / Section

Section 1
Dressings, Splints & Sutures: Bandages (triangular, roller, Hippocrates cap, 8-figure), Kramer wire splints, hemostatic tourniquet, instrument handling, suture techniques (Simple, Blair-Donati, "U"), and suture removal.
Section 2
Manipulations: Hand scrub, gown & glove, field prep, SC/IM/IV injections, ABO/Rh blood typing & Oehlecker test, bladder catheterization, Novocaine blocks (Vishnevskii, Oberst, retromammary), NGT & Sengstaken tube, enemas, drains (Kehr T-tube), and stoma care.
Section 3
Imaging & Endoscopy: Identifying modality and interpreting plain abdominal/chest X-rays (Kloiber cups, pneumoperitoneum sickle), CT (acute pancreatitis, abscess), USG (cholelithiasis, DVT), and endoscopy (peptic ulcer Forrest classification).
Section 4
Laboratory Investigation: Interpreting CBC (leukocytosis, shift-to-left, anemia), biochemistry (bilirubin direct/indirect, electrolytes, Darrow syndrome, amylase, lipase, hypocalcemia), coagulogram, ABG, and peritoneal/pleural fluid analysis.
Section 5
Standardized Patient (Clinical Case): Bedside history, physical signs (Murphy, Rovsing, Blumberg, Patkin triad, etc.), differential diagnosis, and immediate emergency/surgical management.

⚖️ Scoring Rubric & Golden Rules

Max 10 Points

0 Points: Incorrect performing, total omission of critical steps, contamination of sterile field, or failure to diagnose life-threatening condition.

1 Point: Partially correct, incomplete volume, minor procedural hesitation, or partial paraclinical interpretation.

2 Points: Flawless, correct performing in full volume with clear anatomical justification, asepsis respect, and clinical reasoning.

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Golden Exam Rule: Verbalize Every Step!

The examiner cannot read your mind. Always state: (1) Patient consent & hygiene, (2) Anatomical landmarks, (3) Instrument names & proper grip, (4) Potential complications to avoid, and (5) Normal vs abnormal findings!

Section 1

Dressings, Bandages, Splinting & Sutures

Practical Skills (General Part)

🩹 1. Bandages & Dressings Master Guide

Triangular & Roller Bandages

A. Triangular Dressings (Pansamente Triunghiulare / Mitella)

Anatomical Region	Application Technique & Key Maneuver	Fixation / Knot
Head (Capistrum)	Base of triangle placed on occiput, apex hangs over forehead/face; two lateral ends brought forward over apex, crossed on forehead, tied at occiput; apex folded back and pinned.	Reef knot at occiput; secure apex with safety pin.
Shoulder	Two triangular bandages or one folded; base tied around upper arm; apex brought upward over shoulder and tied around neck or secured with second sling.	Cravat knot on lateral arm & around neck.
Chest	Apex placed over affected shoulder; base wrapped horizontally around lower chest; two base ends tied at back, longer end brought up to tie with apex.	Posterior knot below scapula.
Hip Joint	Apex oriented superiorly toward waist; base secured around upper thigh; apex fastened to a cravat band encircling the waist.	Lateral thigh knot + waist anchor cravat.
Foot / Sole (Planta)	Foot placed on open triangle with toes pointing to apex; apex folded over dorsum of foot; base ends crossed over ankle, wrapped around, and tied anteriorly.	Figure-8 wrap around malleoli, tied over anterior ankle.
Hand	Palm placed on cloth, fingers toward apex; apex folded over dorsum of hand/wrist; ends crossed over dorsum, encircled around wrist, and tied.	Wrist knot, immobilizes entire hand and fingers.

B. Roller Bandages (Fași de Tifon - Special Techniques)

Bandage Type	Indications & Anatomical Site	Step-by-Step Execution
Hippocrates Hat (Mitra Hippocratis)	Scalp injuries, cranial surgery, extensive head trauma.	Uses two-headed roller bandage (or 2 bandages). One roll makes continuous horizontal circular turns around forehead/occiput; the second roll makes alternating sagittal recurrent back-and-forth turns from forehead to occiput, each turn held down by the circular band.
Sling Bandage (Praesepium / Praștie)	Nose and chin injuries / dressings.	Bandage strip split at both ends leaving central 10 cm intact. Central pad placed over nose (or chin); upper split ends cross downward under ears to neck; lower split ends cross upward over ears to vertex/occiput.
Figure-of-8 (Tie Bandage)	Elbow, knee, axillary region, radiocarpal, talocrural.	Alternating proximal and distal oblique loops intersecting over the flexion crease of the joint. Preserves dressing stability without constricting circulation.
Glove / Treadmill (Chierotheca)	Single finger (degetar), thumb spica, or all 5 fingers.	Anchor at wrist with 2 circular turns; descend diagonally across dorsum of hand to finger tip; ascending spiral/spiral with reverse folds to base; return across dorsum to wrist. Repeat for each digit.
Leg Bandage with Reverse Folds	Conical limb segment (calf/leg).	Spiral bandaging with thumb thumb-down fold (răsfrângere) on each turn to match increasing leg circumference snugly without gapping.
Turtle Bandage (Testudo)	Flexed elbow or knee joint.	Convergent (Testudo conjuncta): starts at extremities of joint and converges toward the center. Divergent (Testudo reversa): starts with circular turn over patella/olecranon and diverges outward.

🦴 2. Kramer Wire Ladder Splint & Hemostatic Tourniquet

Trauma & Hemostasis

Kramer Wire Splint and Triangular Bandage Demonstration

KRAMER WIRE SPLINT & SLING (OSCE SECTION 1) Clinical Demonstration

Upper extremity immobilization using pre-molded padded Kramer ladder splint secured with roller bandage, supported by triangular bandage sling (mitella).

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3 Golden Rules of Splint Immobilization:

Immobilize at least 2 adjacent joints (the joint above and the joint below the fracture site).
Pre-mold the splint on the healthy limb of the patient or examiner before applying to the injured limb.
Always pad bony prominences (olecranon, malleoli, fibular head) with cotton wool to prevent pressure ulcers, and assess distal pulses & capillary refill before and after application!

Hemostatic Tourniquet (Garou Hemostatic Esmarch) Protocol

Indications: Massive, arterial limb hemorrhage uncontrollable by direct wound compression or pressure dressing.

CRITICAL ANATOMICAL SITES:

Upper Extremity: Upper third of arm (sub-axillary). STRICTLY FORBIDDEN: Middle third of arm due to risk of radial nerve compression in the spiral groove (radial nerve palsy / "wrist drop")!
Lower Extremity: Middle or upper third of thigh.

Rules of Tourniquet Application:

Apply over a layer of cloth/clothing (never directly on bare skin to prevent skin necrosis).
Tighten only until bleeding stops and distal pulse vanishes (avoid over-tightening).
Attach a conspicuous written note: Exact time (hour and minute), date, and name of applicator.
Maximum Duration: Summer: 1.5 – 2.0 hours; Winter: 45 – 60 minutes.
Reperfusion Protocol: Every 30-45 minutes, loosen the tourniquet slowly for 3-5 minutes while holding manual digital pressure on the wound, then reapply slightly proximal.

✂️ 3. Surgical Instruments & Suturing Mastery

Tray Layout & Suture Types

OSCE GENERAL SURGERY INSTRUMENT TRAY Identification Key

Key: (1) Scalpel (No. 10 belly blade), (2) Pean hemostatic clamp (grooved), (3) Kocher hemostatic clamp (toothed 1x2), (4) Mayo dissecting scissors, (5) Anatomical tissue forceps (atraumatic), (6) Surgical tissue forceps (toothed), (7) Hegar needle holder, (8) Suture threads (Vicryl / Polyglactin 910).

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Forceps & Scalpel Handling Rules for Examiners:

Needle Holder (Hegar): Thumb in ring 1, ring finger in ring 2, index finger extended along shank for stabilization. Palmar grip used for heavy suturing.
Tissue Forceps: Held like a pen (between thumb, index, and middle finger). Never hold like a dagger!
Anatomical vs Surgical Forceps: Anatomical (smooth transverse grooves) is strictly used for delicate viscera (bowel, vessels, nerves). Surgical (toothed 1x2) is strictly for skin, fascia, and tough aponeurosis — NEVER on bowel or vessels!

Surgical Suture Techniques Demonstration

3 MANDATORY OSCE SUTURE TECHNIQUES Skill Demonstration

(1) Simple Interrupted Suture: Standard skin closure. (2) Blair-Donati Vertical Mattress: "Far-Far, Near-Near" eversion of skin edges. (3) Horizontal Mattress ("U" Suture): Hemostatic tension distribution.

Thread Type	Resorbable / Non-resorbable	Absorption Time	Best Surgical Indications
Catgut (Simple / Chromic)	Natural Resorbable (sheep intestine submucosa)	Simple: 7-10d Chromic: 21-28d	Subcutaneous fat, rapid mucosal healing. High tissue reaction; rarely used today.
Vicryl (Polyglactin 910)	Synthetic Braided Resorbable	56 – 70 days (tensile strength 50% at 21d)	Subcutaneous tissue, muscle, gastrointestinal anastomoses, biliary tract, urinary tract.
Monocryl / PDS	Synthetic Monofilament Resorbable	Monocryl: 90-120d PDS: 180-210d	Subcuticular skin closure (Monocryl); slow-healing fascia, abdominal wall closure, pediatric surgery (PDS).
Silk (Mătase)	Natural Non-resorbable (protein braid)	Gradual degradation over 2 years	Vessel ligatures, bowel seromuscular sutures. Excellent handling and knot security.
Prolene (Polypropylene)	Synthetic Monofilament Non-resorbable	Permanent (no degradation)	Vascular anastomoses, hernia mesh fixation, abdominal fascia closure, cuticular skin. Zero tissue friction.
Nylon / Ethilon	Synthetic Monofilament Non-resorbable	Permanent / very slow hydrolysis	Standard skin suturing, tendon repair. High tensile strength, minimal inflammation.

Suture Removal Maneuver (Scoate Firelor): Grasp the knot with anatomical tweezers and lift gently. Slide open scissor blade flush against skin surface beneath the knot, cut the suture directly at the skin entry point, and pull the knot toward the incision. This ensures contaminated external thread is never dragged through the subcutaneous channel! Timetable: Face: 4-5d; Scalp: 7d; Abdomen/Thorax: 10-12d; Back & Joints: 12-14d.

Section 2

Clinical Manipulations, Tubes & Local Blocks

Invasive & Bedside Procedures

🩸 1. Blood Group Determination (ABO & Rh)

OSCE Essential

Blood Grouping Porcelain Plate Agglutination Test

PORCELAIN PLATE AGGLUTINATION (SAMPLE #0412) Result: A Positive

Anti-A: Clumping (+); Anti-B: Smooth suspension (-); Anti-D (Rh): Clumping (+). Definitive determination: Group A (II), Rh-positive.

Blood Group	Anti-A Reagent	Anti-B Reagent	Anti-AB Reagent	RBC Antigens & Serum Antibodies
Group O (I)	❌ No agglutination	❌ No agglutination	❌ No agglutination	No A or B antigens; Anti-A and Anti-B antibodies
Group A (II)	✅ Agglutination	❌ No agglutination	✅ Agglutination	Antigen A; Anti-B antibody
Group B (III)	❌ No agglutination	✅ Agglutination	✅ Agglutination	Antigen B; Anti-A antibody
Group AB (IV)	✅ Agglutination	✅ Agglutination	✅ Agglutination	Antigens A and B; No antibodies

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Biological Test of Oehlecker (Bedside Pre-Transfusion Test):

Infuse 10–15 ml of blood rapidly over 1 minute, then stop infusion and monitor patient closely for 3 minutes (watch for shivering, lumbar/flank pain, dyspnea, tachycardia, hypotension). Repeat this test 3 consecutive times before releasing the full transfusion!

🫁 2. Sengstaken-Blakemore Tube & Kehr T-Tube

Special Surgical Tubes

Sengstaken-Blakemore and Kehr T-Tube Display

SURGICAL EQUIPMENT DISPLAY High-Yield Tools

Left: Sengstaken-Blakemore 3-lumen tube for esophageal variceal tamponade. Right: Kehr T-tube biliary drain with connector.

Sengstaken-Blakemore Protocol (Variceal Bleeding):

Test balloons for leaks underwater; pass lubricated tube via nose into stomach.
Inflate gastric balloon with 200–250 ml air, clamp port, pull snugly against cardia/GE junction, apply 0.5–1.0 kg traction.
If bleeding continues: inflate esophageal balloon to 30–40 mmHg monitored with a manometer.
Safety Rule: Deflate esophageal balloon every 12 hours for 15–30 minutes to prevent pressure necrosis and esophageal rupture! Max duration 24–48 hours.

Kehr T-Tube Drain Care & Removal Criteria:

Placed in common bile duct (CBD) after choledochotomy / stone extraction.
Timing: Kept in place for 12 to 14 days minimum to ensure a mature fibrous tract forms around the tube.
Prerequisite 1: Clamping trial for 24–48 hours with NO abdominal pain, jaundice, fever, or leakage around the tube.
Prerequisite 2: Fistulocholangiography (T-tube cholangiogram) showing free, rapid passage of contrast into the duodenum with normal CBD caliber and complete absence of residual calculi or strictures!

💉 3. Local Anesthetic Blocks, Catheters & Enemas

Manipulations Checklist

Novocaine Local Nerve Blocks

Vishnevskii Block: "Creeping tight infiltration" (infiltrație târâtoare) using large volumes (200-500 ml) of dilute 0.25% procaine into fascial compartments for hydraulic dissection and deep regional block.
Oberst-Lukashevich Block: Digital block for finger panaritium / injuries. Rubber band tourniquet at finger base, 1-2 ml 1% lidocaine on medial & lateral sides of proximal phalanx. CONTRAINDICATION: NEVER use adrenaline (causes digital gangrene!).
Retromammary Block: Infiltrate 100-150 ml 0.25% novocaine behind mammary gland via submammary crease before incision of acute mastitis / abscess.
Intercostal Block: Puncture upper border of rib below to reach lower border of upper rib; aspirate before injecting 3-5 ml 1% lidocaine.

Urinary Catheterization & NGT

Foley Catheter: Instill 10 ml 2% lidocaine gel into male urethra; insert catheter until urine flows, advance extra 2-3 cm; inflate balloon with 5-10 ml sterile distilled water (never saline to avoid crystallization in valve!).
Nasogastric Tube (NGT): Measure length: nose tip → earlobe → xiphoid process (~50-55 cm). Lubricate, advance as patient sips water. Verify position: auscultate epigastric whoosh with 20 ml air, aspirate acidic gastric juice (pH < 5.5).
Post-Op Gastric Lavage: Intermittent infusion and siphoning of 300-500 ml warm saline in pyloric stenosis or gastric resection until returned aspirate is clear.

Enemas & Pulse Oximetry

Cleansing Enema: 1.0–1.5 L warm water (36-37°C), left lateral Sims position, cannula inserted 8-10 cm, reservoir elevated 1 meter.
Hypertonic Enema: 50–100 ml 10% NaCl or MgSO4; osmotic fluid draw stimulates strong peristalsis.
Ognev Enema: 50 ml 10% NaCl + 30 ml 3% H2O2 + 50 ml Glycerin. Vigorous mechanical and osmotic stimulus for refractory paralytic ileus!
Pulse Oximetry (SpO2): 660nm (red) and 940nm (infrared) spectrophotometry. Normal ≥ 95%. Pitfalls: hypoperfusion, nail polish, CO poisoning (falsely high), methemoglobinemia (~85%).

Section 3

Special Surgical Pathology, Semiology & Signs

Bedside Signs & Maneuvers

🩹 1. Acute Appendicitis: Points & Eponymous Signs

High Frequency

Pain Points of Maximum Tenderness:

McBurney's Point: Junction of lateral 1/3 and medial 2/3 of spinoumbilical line (from right ASIS to umbilicus).
Lanz's Point: Junction of right 1/3 and middle 1/3 of the bi-iliac line (between anterior superior iliac spines).
Morris's Point: Medial 1/3 of the spinoumbilical line (closer to umbilicus).
Sonnenburg's Point: Intersection of bi-iliac line with the lateral border of right rectus abdominis muscle.

Clinical Sign	Examination Technique	Clinical & Pathological Significance
Dieulafoy Sign	Gentle stroking or pinching of skin over right iliac fossa (Sherren's triangle).	Cutaneous hyperesthesia indicating localized somatic peritoneal irritation.
Rovsing Sign	Pressure or percussion applied deeply in left iliac fossa.	Triggers sharp pain in right iliac fossa due to retrograde displacement of colonic gas distending the inflamed cecum.
Sitkovsky Sign	Patient is asked to roll from supine position onto the left side.	Exacerbation of right iliac fossa pain as the inflamed appendix and cecum drop and stretch inflamed mesentery.
Bartomier-Michelson	Palpation of right iliac fossa while the patient remains in the left lateral decubitus position.	Significantly more painful than supine palpation because abdominal muscles relax and cecum shifts forward.
Cope's Psoas Sign	Patient on left side; examiner passively hyperextends the right hip.	Pain indicates retrocecal appendix irritating the underlying iliopsoas muscle.
Cope's Obturator Sign	Patient supine; examiner flexes right hip and knee to 90° and internally rotates the thigh.	Pain in hypogastrium indicates pelvic appendix irritating internal obturator muscle.
Blumberg Sign	Slow, deep abdominal palpation followed by sudden, abrupt release of hand.	Sharp rebound tenderness — cardinal sign of peritoneal irritation (parietal peritonitis).
Mandel-Razdolsky Sign	Gentle fingertip percussion across abdominal quadrants.	Localized percussion pain over right iliac fossa — sign of localized peritonitis.

🛡️ 2. Abdominal Wall Hernias: Differentiation

Inguinal & Strangulation

Weak Zones of the Abdominal Wall:

Inguinal canal, femoral canal (under inguinal ligament medial to femoral vein), umbilical ring, linea alba (epigastric hernias), linea semilunaris Spigelii, lumbar triangles of Petit (inferior) and Grynfeltt (superior).

Strangulated Hernia (Hernie Ștrangulată) Diagnostic Triad:

Sudden, acute, severe non-radiating pain at the hernia site.
Tense, rock-hard, exquisitely tender, irreducible swelling.
Total absence of expansile cough impulse (+ subsequent signs of mechanical bowel obstruction).

Feature	Indirect (Oblique External) Inguinal Hernia	Direct (Internal) Inguinal Hernia
Anatomical Pathway	Enters deep ring lateral to inferior epigastric vessels; travels along inguinal canal within spermatic cord; exits external ring.	Bulges directly forward through Hesselbach's triangle medial to inferior epigastric vessels.
Deep Ring Occlusion Test	Finger over deep ring (midway between ASIS and pubic tubercle) PREVENTS hernia descent on coughing.	Hernia continues to bulge despite deep ring occlusion.
Scrotal Descent & Strangulation	Frequently descends into scrotum; narrow neck → High risk of strangulation. Common in youth.	Rarely reaches scrotum; wide neck → Low strangulation risk. Common in elderly men.
Post-Op Care	Application of a scrotal suspensory bandage post-herniotomy to eliminate dead space and prevent scrotal hematoma.

🩻 3. Intestinal Occlusion (Bowel Obstruction)

Radiology & Clinical Level

Erect Abdominal X-Ray showing Kloiber Cups and Intestinal Obstruction

ERECT ABDOMINAL RADIOGRAPH: KLOIBER FLUID LEVELS Diagnostic Hallmark

Multiple classic step-ladder air-fluid levels (Kloiber cups) with transverse plicae circulares spanning full bowel width in mechanical small bowel obstruction.

Obstruction Level	Clinical Presentation	Radiological Distinctions (X-Ray)
High Small Bowel (Jejunal)	Early, intractable vomiting; severe dehydration; minimal abdominal meteorism; rapid metabolic alkalosis.	Few central fluid levels; valvulae conniventes (herringbone/feather pattern); no colon gas.
Low Small Bowel (Ileal)	Bilious to fecaloid vomiting; central step-ladder distension; colicky cramping pain; absolute obstipation.	Numerous Kloiber levels in center of abdomen; air-fluid levels are wider than tall.
Large Bowel (Colonic)	Massive peripheral distension along colonic frame; late fecaloid vomiting; obstipation. Closed-loop risk!	Peripheral air-fluid levels that are taller than wide; prominent haustrations (do not cross full lumen).

Special Tests & Pre-op Protocol: (1) Schwartz test: Oral contrast with serial X-rays to assess transit time; (2) Irigoscopy: Contrast enema for colorectal block / "bird's beak" in sigmoid volvulus; (3) Pre-Op Protocol: NGT decompression, aggressive Ringer's lactate/saline hydration, Foley catheter for hourly diuresis (≥0.5 ml/kg/h), broad-spectrum IV antibiotics, antispasmodics.

💥 4. Peptic Ulcer: Perforation, Bleeding & Stenosis

Triad of Ulcer Complications

PA Chest Radiograph Pneumoperitoneum Crescent

ERECT CHEST X-RAY: SUBDIAPHRAGMATIC FREE GAS SICKLE Perforated Ulcer

Crescent-shaped radiolucency beneath right hemidiaphragm (pneumoperitoneum). Correlates with Jobert's sign (disappearance of hepatic dullness).

A. Perforated Peptic Ulcer Semiology:

Sudden catastrophic "dagger-thrust" pain (Dieulafoy); board-like rigidity ("ventre de bois"); Jobert's sign (hepatic dullness replaced by percussion tympany); Spasokukotsky sign (complete peristaltic silence). If X-ray is inconclusive, perform pneumogastrography (inject 200-300 ml air via NGT) and repeat X-ray.

B. Bleeding Peptic Ulcer & Forrest Classification:

Endoscopy Bleeding Peptic Ulcer Forrest IIa

ENDOSCOPY: DUODENAL BULB ULCER (FORREST IIa/Ib)

Pigmented visible vessel protuberance with active oozing. Rebleeding risk 50%.

Forrest Class: Ia (Spurting arterial), Ib (Oozing), IIa (Non-bleeding visible vessel), IIb (Adherent clot), IIc (Black hematin base), III (Clean ulcer base).
Drug Protocol: IV Omeprazole 80 mg bolus → 8 mg/h infusion × 72h + Octreotide 50 mcg bolus → 50 mcg/h.

C. Pyloroduodenal Stenosis & Darrow Syndrome:

Barium Meal Radiograph Pyloric Stenosis Gastromegaly

BARIUM MEAL: GASTROMEGALY & THREE-LAYER SIGN Pyloric Stenosis

Enormous stomach sagging into pelvis, string-like pyloric canal, and characteristic three-layer fluid retention (>80% barium retention at 24 hours).

Patkin Triad: (1) Succussion splash ("clapotage"); (2) Visible peristalsis; (3) Asymmetric left hypochondrium fullness.
Kussmaul Sign: Visible peristaltic waves traveling left to right across epigastrium.
Darrow Syndrome: Severe persistent vomiting of HCl causes hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria, secondary prerenal azotemia, and tetany. Barium meal shows 3 layers and >24h retention.

🟢 5. Gallbladder & Biliary Disease Semiology

Signs & Ultrasonography

Gallbladder Ultrasound Acute Cholecystitis Gallstones

ULTRASOUND: ACUTE CALCULOUS CHOLECYSTITIS Gold Standard Imaging

Thickened gallbladder wall (5.8 mm > 3mm) with double-rim halo sign, multiple calculi (cholelithiasis), and intense posterior acoustic shadowing.

Eponymous Sign	Execution & Findings	Clinical Significance
Murphy's Sign	Deep palpation under right costal margin while patient inhales deeply.	Sudden arrest of inspiration due to sharp acute pain when inflamed gallbladder contacts examiner's fingers.
Ortner's Sign	Gentle percussive tap with ulnar border of hand over right costal arch.	Sharp pain triggered over inflamed liver/gallbladder bed (Ortner's percussion symptom).
Mussie-Gheorghievsky Sign	Pressure applied between sternal and clavicular heads of right sternocleidomastoid muscle.	Exquisite tenderness — phrenic nerve sign due to diaphragmatic peritoneum irritation.
Courvoisier-Terrier Sign	Palpable, distended, non-tender gallbladder in a patient with progressive jaundice.	Suggests malignant periampullary or pancreatic head tumor obstruction (NOT gallstones).

🔥 6. Acute Pancreatitis: Clinical Signs & CT

Severe Abdominal Emergency

Contrast CT Acute Necrotizing Pancreatitis Balthazar E

CONTRAST-ENHANCED AXIAL CT: BALTHAZAR GRADE E Necrotizing Pancreatitis

Diffuse pancreatic swelling, lack of parenchymal enhancement (necrosis), and extensive peripancreatic fluid collections and inflammatory fat stranding.

Cardio-Abdominal & Retroperitoneal Signs:

Körte's Sign: Painful transverse band of muscular resistance 6-7 cm above umbilicus along the anatomical axis of the pancreas.
Mayo-Robson's Sign: Exquisite tenderness on palpation in the left costovertebral angle (phrenico-costal angle).
Voskresensky's Sign: Absence of palpable epigastric abdominal aortic pulsation due to pancreatic retroperitoneal inflammatory phlegmon.
Grey Turner's Sign: Bluish-purple ecchymosis of the flanks (retroperitoneal dissection of hemorrhagic exudate).
Cullen's Sign: Periumbilical ecchymosis (hemoperitoneum tracking along falciform ligament).
Gobiet's Sign: Epigastric meteorism due to isolated transverse colon dilatation (colon cut-off sign).

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Laboratory Hallmarks & Severity Marker:

Serum lipase (>3× normal, persists 8-14d), serum amylase, urinary diastase. Hypocalcemia (< 2.0 mmol/L) is a critical indicator of severity due to calcium consumption in retroperitoneal fat saponification.

🫁 7. Thoracic & Abdominal Trauma Emergencies

Life-Threatening Trauma

Tension Pneumothorax Chest Radiograph Mediastinal Shift

CHEST RADIOGRAPH: RIGHT TENSION PNEUMOTHORAX Immediate Needle Decompression

Hyperlucent right hemithorax, total collapse of right lung, flattened diaphragm, and marked tracheal/mediastinal shift to the contralateral left side.

Tension (Suffocating/Valvular) Pneumothorax Protocol:

Severe dyspnea, tracheal deviation, absent breath sounds, hyperresonance, hypotension (obstructive shock). IMMEDIATE ACTION BEFORE X-RAY: Needle thoracocentesis with large-bore cannula (14-16G) in 2nd intercostal space midclavicular line (or 5th ICS AAL). Followed immediately by tube thoracostomy connected to underwater Bülau drain.

Pleural Puncture (Thoracocentesis) Landmarks:

7th or 8th intercostal space on posterior axillary or scapular line. Puncture strictly at the UPPER BORDER OF THE LOWER RIB to avoid the intercostal neurovascular bundle (Vein-Artery-Nerve) located in the subcostal groove of the upper rib!

Emergency Thoracotomy Indications in Hemothorax:

Immediate initial drainage > 1,500 ml of blood upon chest tube insertion.
Persistent bleeding > 200–300 ml/hour for 3–4 consecutive hours.

Blunt Abdominal Trauma (DPL Positive Criteria):

Aspiration of >10 ml gross blood, RBC count >100,000/mm³, WBC count >500/mm³, presence of bile, amylase, bacteria or food debris.

🩸 8. Venous Pathology & Varicose Vein Tests

DVT & Functional Tests

Duplex Doppler Ultrasound of Deep Vein Thrombosis

VASCULAR DUPLEX ULTRASOUND: ACUTE FEMORAL DVT Gold Standard

Common femoral vein (CFV) non-compressibility under probe pressure, hypoechoic intraluminal thrombus, and absent Doppler color flow.

Functional Test	Method & Execution	Pathological Interpretation
Brodie-Trendelenburg-Troyanov	Patient supine, leg elevated to empty veins; apply tourniquet over saphenofemoral junction; patient stands.	Rapid filling from above upon releasing tourniquet = Saphenofemoral junction incompetence. Rapid filling within 30s before release = Incompetent perforator veins.
Perthes Test	Tourniquet placed below knee on standing patient (veins distended); patient walks for 5-10 minutes.	Veins collapse = Deep venous system is patent. Veins remain distended/painful = Deep venous obstruction (Absolute contraindication to stripping!).
Delbet Test	Tourniquet applied around upper thigh; patient walks.	Evaluates functional patency of the muscular calf veno-motor pump.
Pratt I & II Tests	Double elastic bandage applied from toes upwards; unwrap lower bandage on standing patient.	Locates exact anatomical site of incompetent perforator veins where veins bulge between wraps.
Sheinis Test	Three tourniquets applied: upper thigh, above knee, below knee.	Segmentally isolates saphenofemoral, saphenopopliteal, and perforator vein incompetence.
Homans & Moses Signs	Homans: calf pain on forced dorsiflexion of foot. Moses: calf pain on anteroposterior compression against tibia.	Cardinal physical signs of Deep Vein Thrombosis (DVT).

Bleeding Varicose Vein Emergency: Immediate limb elevation + local sterile compression dressing. STRICTLY FORBIDDEN: Never apply a proximal tourniquet (which impedes venous return and accelerates hemorrhaging!).

Section 4

Paraclinical Investigation Master Reference

Normal Ranges & Surgical Significance

📊 Complete Blood Count, Chemistry & Coagulation Master Table

Surgical Interpretation Guide

Investigation	Standard Normal Range	Elevated In Surgical Pathology	Decreased In Surgical Pathology	Surgical Significance & Red Flags
Hemoglobin (Hb)	Male: 130–170 g/L Female: 120–150 g/L	Hemoconcentration (severe pancreatitis, bowel obstruction, burns, dehydration)	Acute gastrointestinal bleeding, ruptured spleen/liver, chronic malnutrition/malignancy	Grade I anemia (90-110), Grade II (70-90), Grade III (<70 g/L). Transfusion threshold usually <70-80 g/L.
Hematocrit (Hct)	Male: 40–52% Female: 36–48%	Severe dehydration, hypovolemia, hemoconcentration (>44% in pancreatitis indicates severe necrosis)	Active hemorrhage (after fluid resuscitation), chronic blood loss	Reliable gauge of intravascular fluid depletion and hemoconcentration.
WBC & Band Forms	WBC: 4.0–9.0 × 10⁹/L Bands: 1–5%	Appendicitis, peritonitis, phlegmon, acute cholecystitis, bowel strangulation	Severe sepsis / septic shock (depleted marrow), viral infections	Left shift (Bands > 6-10%): Hallmarked in gangrenous appendicitis, purulent peritonitis, infected necrosis!
Total & Direct Bilirubin	Total: 8.5–20.5 μmol/L Direct: 0–5.1 μmol/L	Direct (conjugated) >50%: Choledocholithiasis, periampullary cancer, biliary stricture (mechanical jaundice). Indirect >80%: Hemolysis.	N/A	Dark urine and clay-colored pale stools characteristic of mechanical/obstructive jaundice.
ALT, AST & ALP, GGT	ALT: 7–56 U/L ALP: 44–147 U/L GGT: 9–48 U/L	ALP & GGT elevated >3x: Obstructive biliary pathology / choledocholithiasis. AST/ALT high: Hepatocellular necrosis.	N/A	Differential: High ALP/GGT + High Direct Bilirubin = Biliary obstruction!
Serum Amylase & Lipase	Amylase: 28–100 U/L Lipase: 10–140 U/L	Acute pancreatitis (>3x upper limit), perforated duodenal ulcer (moderate rise), bowel infarction	End-stage pancreatic destruction, chronic fibrosis	Lipase is significantly more specific than amylase and remains elevated for 8–14 days.
Serum Calcium (Ca²⁺)	2.15–2.55 mmol/L (Total) 1.15–1.33 mmol/L (Ionized)	Hyperparathyroidism, bone metastasis	Severe acute pancreatitis (<2.0 mmol/L), Darrow syndrome	Hypocalcemia in pancreatitis is due to enzymatic fat necrosis and saponification; cardinal prognostic marker!
Electrolytes (Na⁺, K⁺, Cl⁻)	Na⁺: 135–145 mmol/L K⁺: 3.5–5.0 mmol/L Cl⁻: 96–106 mmol/L	Hyperkalemia in crush syndrome, acute renal failure, massive hemolysis	Darrow Syndrome (Pyloric Stenosis): Hypochloremia (<90), Hypokalemia (<3.5), causing metabolic alkalosis!	Hypokalemia causes cardiac arrhythmias, paralytic ileus, and muscle weakness. Supplement IV with 0.9% saline!
Arterial Blood Gas & Lactate	pH: 7.35–7.45 HCO3⁻: 22–26 mmol/L Lactate: 0.5–2.0 mmol/L	Lactate > 2.0–4.0 mmol/L in bowel ischemia/gangrene, hemorrhagic shock, severe septic peritonitis	Low pH and low HCO3⁻ indicate metabolic acidosis	Serial lactate clearance is the best clinical gauge of shock resuscitation adequacy.
Coagulogram (PT/INR, aPTT, D-Dimer)	INR: 0.8–1.2 aPTT: 25–35s D-Dimer: <500 ng/mL	D-Dimer > 500–5000 in acute DVT and pulmonary embolism; prolonged INR/aPTT in liver failure, DIC, or warfarin	Fibrinogen < 1.5 g/L in consumptive coagulopathy / DIC	Prerequisite before any surgery: INR ≤ 1.5, Platelets ≥ 50–100 × 10⁹/L.

Section 5

Standardized Patient Diagnostic Simulator (12 Clinical Cases)

Paraclinical Interpretation & Diagnosis

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How to Use the Interactive Diagnostic Simulator:

Read the clinical presentation, analyze the paraclinical blood/urine/fluid results and imaging findings, formulate your diagnosis, and then click "Reveal Diagnosis & Paraclinical Analysis" to review the complete diagnostic breakdown, pathophysiology, differentials, and emergency protocol!

Acute Abdomen: Right Lower Quadrant Pain

24-year-old male • 14h history • Epigastric shift to RIF • Dieulafoy & Rovsing (+)

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Clinical Vignette: Patient presented with initial dull periumbilical/epigastric ache that migrated 6 hours later to the right iliac fossa (Kocher-Volkovich sign). Now accompanied by nausea, anorexia, and low-grade fever (38.1°C). On physical exam: cutaneous hyperesthesia in Sherren's triangle (Dieulafoy +), right iliac fossa rebound tenderness (Blumberg +), pain in RIF on left fossa palpation (Rovsing +), increased pain on left lateral decubitus (Sitkovsky & Bartomier-Michelson +).

📊 Paraclinical Laboratory Profile:

WBC	17.8 × 10⁹/L (Normal: 4.0–9.0)	Leukocytosis with Left Shift
Band Neutrophils	18% (Normal: 1–5%)	Marked inflammatory shift
CRP	88 mg/L (Normal: <5.0)	High acute-phase reactant
Urinalysis	Clear, occasional RBCs (3-4/hpf)	Ureteral proximity irritation

🩻 Ultrasound Findings:

Right Iliac Fossa Ultrasound Acute Appendicitis Target Sign

RLQ ULTRASOUND: TARGET SIGN Outer Ø 9.2 mm

Non-compressible blind-ending tubular structure with classic concentric target sign (bullseye) and hyperechoic periappendiceal fat.

Non-compressible, blind-ending tubular structure in the right iliac fossa measuring 9.2 mm in outer diameter (>6 mm). "Target sign" on cross-section with wall hypervascularity on color Doppler. Local periappendiceal fat stranding and trace free fluid.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute phlegmonous-gangrenous appendicitis with localized peritonitis.

Paraclinical Justification: Marked leukocytosis (17.8 × 10⁹/L) with significant left shift (18% bands) and high CRP (88 mg/L) confirming bacterial transmural inflammation. Ultrasound reveals non-compressible appendix >9 mm with target sign and surrounding free fluid.

Differential Diagnoses: Acute mesenteric lymphadenitis (common in youth, multiple enlarged lymph nodes), Meckel's diverticulitis, acute terminal ileitis (Crohn's), right renal colic (severe radiating loin-to-groin pain, prominent hematuria), gynecological pathology in females (ruptured ovarian cyst, ectopic pregnancy).

Preoperative & Emergency Plan: NPO, IV fluid resuscitation (crystalloids), IV analgesia (avoid masking peritoneal signs until surgeon reviews), prophylactic single-dose broad-spectrum antibiotics (Ceftriaxone 2g IV + Metronidazole 500mg IV), urgent laparoscopic or open appendectomy within 12–24 hours.

Acute Abdomen: Perforated Peptic Ulcer & Peritonitis

48-year-old male • Sudden "dagger-thrust" pain • Board-like rigidity • Jobert (+)

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Clinical Vignette: Patient with a 5-year history of episodic postprandial burning epigastric pain experienced sudden, catastrophic, agonizing epigastric pain 2 hours ago ("like a knife stabbing into the stomach" - Dieulafoy dagger-thrust). On physical exam: patient lies motionless with thighs flexed; abdominal wall is completely immobile during respiration with stone-like muscular rigidity ("ventre de bois"); generalized rebound tenderness (Blumberg +); percussion reveals total disappearance of hepatic dullness in the midclavicular line (Jobert's sign); auscultation reveals complete bowel silence (Spasokukotsky's sign).

📊 Paraclinical Laboratory Profile:

WBC	16.2 × 10⁹/L (Normal: 4.0–9.0)	Severe leukocytosis
Serum Amylase	260 U/L (Normal: 28–100)	Moderate reactive rise
ABG pH	7.31 • Lactate: 3.2 mmol/L	Metabolic lactic acidosis
Hb / Hct	145 g/L / 43%	Baseline normal / hemoconcentration

🩻 Erect Chest Radiograph:

Pneumoperitoneum Subdiaphragmatic Free Gas

ERECT CHEST X-RAY: PNEUMOPERITONEUM

Prominent crescent-shaped free air sickle under the right hemidiaphragm.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Perforated duodenal (or prepyloric) peptic ulcer complicated by acute generalized chemical-purulent peritonitis; pneumoperitoneum.

Paraclinical Justification: Erect chest X-ray demonstrates the pathognomonic subdiaphragmatic gas sickle (free intra-abdominal air confirming hollow visceral perforation). Moderate hyperamylasemia is typical due to peritoneal absorption of gastroduodenal fluid. High lactate (3.2 mmol/L) reflects systemic hypoperfusion and peritoneal inflammation.

Differential Diagnoses: Acute pancreatitis (hyperamylasemia >3x normal, epigastric pain radiating to back, absence of subdiaphragmatic free air on X-ray), acute cholecystitis with perforation, acute myocardial infarction (inferior wall), high small bowel strangulation.

Preoperative & Emergency Management: Immediate NPO; insert wide-bore NGT on continuous active suction to decompress stomach and prevent further peritoneal leakage; vigorous IV crystalloid resuscitation (2–3 L Ringer's lactate); IV high-dose PPI (Omeprazole 80 mg IV bolus); broad-spectrum IV antibiotics covering Gram-negatives and anaerobes (Ceftriaxone + Metronidazole); emergency laparotomy/laparoscopy: Graham patch omentopexy closure of perforation, copious peritoneal lavage, and abdominal cavity drainage.

Acute Abdomen: Severe Acute Pancreatitis (Balthazar E)

52-year-old male • Post-heavy meal/alcohol • Körte & Mayo-Robson (+) • Hypocalcemia

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Clinical Vignette: Patient presented with severe, unremitting belt-like epigastric pain radiating through to the back following heavy food and alcohol consumption. Accompanied by repeated non-bilious vomiting that provides no relief. On physical examination: pale, tachycardic (HR 118 bpm), BP 95/60 mmHg; transverse painful epigastric resistance palpated 6 cm above umbilicus (Körte's sign); exquisite tenderness at left costovertebral angle (Mayo-Robson's sign); absence of epigastric aortic pulsation (Voskresensky's sign); faint bluish discoloration observed around umbilicus (Cullen's sign).

📊 Paraclinical Laboratory Profile:

Serum Lipase	3,450 U/L (Normal: 10–140)	>24x elevation (diagnostic)
Serum Amylase	1,280 U/L (Normal: 28–100)	>12x elevation
Serum Calcium	1.72 mmol/L (Normal: 2.15–2.55)	Critical Hypocalcemia
Hematocrit (Hct)	48.5% (Normal: 40–52%)	Severe hemoconcentration
CRP (48h)	280 mg/L (Normal: <5)	Necrotizing marker (>150)

🩻 Abdominal CT Contrast:

Contrast CT Pancreatitis Balthazar E Necrosis

AXIAL CT: ACUTE NECROTIZING PANCREATITIS

Balthazar grade E with non-enhancing pancreatic parenchyma and fluid collections.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Severe acute necrotizing pancreatitis (Balthazar grade E, CT severity index 8/10), complicated by retroperitoneal inflammatory phlegmon, hypocalcemia, and systemic inflammatory response syndrome (SIRS).

Paraclinical Justification: Serum lipase elevated >24x normal; CT scan demonstrates diffuse pancreatic parenchymal necrosis and extensive peripancreatic collections. Critical hypocalcemia (1.72 mmol/L) is a direct consequence of enzymatic fat necrosis (pancreatic lipases break down retroperitoneal triglycerides into free fatty acids which saponify and bind ionized calcium into insoluble soaps). Elevated Hct (48.5%) reflects massive capillary leak into retroperitoneal third space.

Differential Diagnoses: Perforated peptic ulcer (has free air on X-ray, sudden dagger onset), acute mesenteric ischemia (severe pain out of proportion to exam, high lactate), acute cholecystitis, aortic dissection.

Intensive Management Protocol: Admission to ICU; aggressive targeted fluid resuscitation with Ringer's lactate (250–500 ml/h titrated to urine output ≥0.5–1.0 ml/kg/h and Hct normalization); multi-modal analgesia (epidural analgesia or opioids with spasmolytics); IV Calcium gluconate supplementation; strict NPO in hyperacute phase; early enteral nutrition via nasojejunal tube once hemodynamics stabilize; Somatostatin/Octreotide; prophylactic antibiotics NOT routinely recommended unless infected necrosis is proven by CT-guided FNA.

Acute Abdomen: Mechanical Small Bowel Obstruction (Ileus)

61-year-old female • Prior hysterectomy • Colicky pain • Vomiting • Kloiber cups (+)

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Clinical Vignette: Patient with a past surgical history of total abdominal hysterectomy 6 years ago presented with crampy, colicky abdominal pain occurring in waves every 5-10 minutes, accompanied by repeated bilious and feculent vomiting. No passage of stool or flatus for 36 hours. Physical examination reveals asymmetric central abdominal distension; visible peristaltic waves (Schlange's sign); early metallic tinkling, high-pitched borborygmi followed by auscultatory silence (Spasokukotsky's water-drop sound); empty rectal ampulla on digital rectal examination.

📊 Paraclinical Laboratory Profile:

Potassium (K⁺)	3.1 mmol/L (Normal: 3.5–5.0)	Hypokalemia (loss in vomitus)
Chloride (Cl⁻)	89 mmol/L (Normal: 96–106)	Hypochloremia
Urea / Creatinine	14.8 mmol/L / 130 μmol/L	Prerenal azotemia (dehydration)
Lactate	1.8 mmol/L (Normal: <2.0)	No strangulation / ischemia yet

🩻 Erect Abdominal X-Ray:

ERECT ABDOMEN: STEP-LADDER KLOIBER CUPS

Centrally located air-fluid levels that are wider than tall with valvulae conniventes.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute mechanical small bowel obstruction (adhesive ileus secondary to pelvic postoperative adhesions); dehydration and secondary prerenal azotemia.

Paraclinical Justification: Plain erect abdominal radiograph shows multiple central step-ladder air-fluid levels (Kloiber cups) with plicae circulares and collapse of the colon, characteristic of mechanical small bowel occlusion. Electrolytes demonstrate hypochloremic hypokalemic dehydration with elevated BUN/creatinine ratio (prerenal azotemia). Normal lactate indicates absence of bowel strangulation/gangrene at present.

Differential Diagnoses: Paralytic (adynamic) ileus (diffuse gas in both small bowel and colon with sluggish/absent bowel sounds), strangulated groin hernia (always examine femoral and inguinal orifices!), large bowel obstruction (colonic dilatation >6cm, haustrations), acute mesenteric ischemia.

Preoperative & Emergency Protocol: Nasogastric decompression with Salem sump tube on continuous suction; vigorous fluid resuscitation with 0.9% NaCl + KCl supplementation (correct hypokalemia to prevent cardiac arrhythmia); catheterize bladder (hourly diuresis monitoring); perform water-soluble contrast follow-through (Gastrografin / Schwartz test) to evaluate transit; if no contrast enters cecum by 24h or if peritoneal signs, fever, leukocytosis or elevated lactate develop → immediate exploratory laparotomy, adhesiolysis, and bowel viability assessment.

Pyloroduodenal Stenosis & Darrow Syndrome

58-year-old male • Copious vomiting of stale food • Patkin Triad (+) • Tetany

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Clinical Vignette: Patient with a 15-year history of recurrent, cicatrizing duodenal ulcer disease presents with severe progressive weight loss (14 kg in 4 months) and daily, voluminous vomiting occurring late in the evening or night, containing foul-smelling food eaten 1-2 days earlier. Vomitus contains no bile. On physical examination: emaciated, dry inelastic skin; prominent fullness in the left hypochondrium; positive succussion splash elicited >6 hours after fasting; visible gastric peristaltic waves traveling across epigastrium (Kussmaul's sign); carpopedal spasms and positive Chvostek and Trousseau signs (muscle tetany).

📊 Paraclinical Laboratory Profile:

Chloride (Cl⁻)	76 mmol/L (Normal: 96–106)	Severe Hypochloremia
Potassium (K⁺)	2.6 mmol/L (Normal: 3.5–5.0)	Severe Hypokalemia
Serum Sodium (Na⁺)	128 mmol/L (Normal: 135–145)	Hyponatremia
Arterial Blood Gas	pH: 7.56 • HCO3⁻: 38 mmol/L	Severe Metabolic Alkalosis
Urine pH	5.2 (Paradoxical Aciduria)	Pathognomonic of Darrow Syn.
Urea / Creatinine	18.5 mmol/L / 180 μmol/L	Prerenal azotemia

🩻 Barium Meal Examination:

UPPER GI BARIUM: PYLORIC STENOSIS Three-Layer Sign

Marked gastromegaly sagging into pelvis, string-sign pyloric narrowing, absent duodenal filling, and >80% barium retention at 24 hours.

Enormous gastromegaly: the greater curvature of the stomach sags deeply into the true pelvic cavity. The pyloric canal is narrowed to a thread-like lumen with complete absence of duodenal bulb filling. Three-layer phenomenon: dense barium residue at bottom, layer of clear fluid in middle, and air/food debris at the top. Retention of >80% of barium in stomach after 24 hours.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Cicatricial pyloroduodenal stenosis in the decompensated stage secondary to chronic peptic ulcer disease, complicated by Darrow syndrome (hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria, hypocalcemic tetany, dehydration, and secondary prerenal azotemia).

Pathophysiological Mechanism of Darrow Syndrome: Massive loss of gastric hydrochloric acid (H⁺ and Cl⁻) leads to primary metabolic alkalosis. In response to hypovolemia, aldosterone acts on the distal renal tubule to reabsorb Na⁺, but because Cl⁻ is depleted, the kidney must excrete K⁺ and H⁺ in exchange for Na⁺, producing paradoxical aciduria in the face of systemic alkalosis! Severe hypokalemia and secondary hypocalcemia (alkalosis increases calcium binding to albumin) trigger muscle tetany and carpopedal spasm.

Differential Diagnoses: Antral gastric adenocarcinoma (older age, anorexia, cachexia, endoscopy shows irregular ulcerated mass), gastroparesis (diabetic, no mechanical obstruction on barium/endoscopy), duodenal compression by superior mesenteric artery (Wilkie's syndrome).

Preoperative & Emergency Management: Daily saline gastric lavage via large-bore Levin tube (clears food debris, reduces mucosal edema and bacterial fermentation); aggressive correction of metabolic alkalosis with IV 0.9% Normal Saline + extensive KCl infusion (30–40 mEq/L at ≤20 mEq/h; never administer glucose solutions without potassium as glucose drives K⁺ into cells and worsens paralysis); IV calcium gluconate for tetany; total parenteral nutrition (TPN); elective definitive surgery once metabolic panel normalizes (Truncal Vagotomy + Gastrojejunostomy, or Antrectomy + Billroth I/II).

Upper Gastrointestinal Bleeding: Peptic Ulcer (Forrest Ib)

45-year-old male • Hematemesis & Melena • Shock Index: 1.25 • Hb: 68 g/L

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Clinical Vignette: Patient with a history of NSAID use for lumbar back pain suffered 2 episodes of massive "coffee-ground" hematemesis followed by the passage of foul-smelling, sticky, tarry-black stools (melena). On arrival in emergency: pale, diaphoretic, cold extremities; heart rate 125 bpm, blood pressure 85/55 mmHg. Algöwer Shock Index: 125 / 85 = 1.47 (severe hemorrhagic shock). Abdomen is soft, mildly tender in epigastrium, without peritoneal defense. Digital rectal exam confirms pitch-black melenic stool on glove.

📊 Paraclinical Laboratory Profile:

Hemoglobin (Hb)	68 g/L (Normal: 130–170)	Severe Acute Anemia (Grade III)
Hematocrit (Hct)	21.5% (Normal: 40–52%)	Critical hemodilution
RBC Count	2.2 × 10¹²/L	Marked normocytic anemia
BUN / Urea	16.4 mmol/L	GI blood protein absorption
Serum Creatinine	92 μmol/L (Normal)	Normal baseline renal status
Coagulogram	INR: 1.1 • aPTT: 28s	No underlying coagulopathy

🩻 Urgent Upper Endoscopy (EGD):

ENDOSCOPY: DUODENAL BULB ULCER (FORREST Ib/IIa)

Large ulcer crater on posterior duodenal wall with visible pigmented vessel and active oozing.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute upper gastrointestinal hemorrhage from a chronic duodenal bulb ulcer (posterior wall); Forrest Class IIa/Ib (visible non-bleeding vessel with active oozing); severe acute post-hemorrhagic anemia (Grade III); Class III hypovolemic-hemorrhagic shock (Algöwer Shock Index 1.47).

Paraclinical Justification: Critical Hb of 68 g/L and Hct 21.5% in the presence of tachycardia and hypotension indicate acute blood loss >30–40% of circulating blood volume (>1,500 ml). Disproportionate elevation of blood urea nitrogen (BUN) with normal creatinine is pathognomonic of upper GI bleeding, resulting from massive breakdown and absorption of digested red blood cell proteins in the small intestine.

Differential Diagnoses: Bleeding esophageal/gastric varices (history of cirrhosis, stigmata of portal hypertension), Mallory-Weiss tear (violent vomiting preceding hematemesis), Dieulafoy lesion, hemorrhagic gastritis, gastric cancer.

Emergency Management Protocol: Two large-bore peripheral IV lines (16G or 14G); immediate crystalloid infusion followed by matched Packed Red Blood Cells (PRBCs) with target Hb 70–90 g/L; IV Omeprazole 80 mg bolus followed by 8 mg/h continuous infusion for 72 hours; Tranexamic acid 1g IV; urgent therapeutic EGD: dual endoscopic hemostasis (epinephrine injection 1:10,000 + bipolar electrocoagulation or hemoclip placement); if endoscopic hemostasis fails → urgent transcatheter arterial embolization (TAE) or emergency laparotomy with duodenotomy and transfixion ligation of the gastroduodenal artery (GDA).

Acute Calculous Cholecystitis & Choledocholithiasis

54-year-old female • RUQ pain • Jaundice & Dark urine • Murphy (+) • USG Gallstones

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Clinical Vignette: Patient presented with severe right upper quadrant colic radiating to the right scapula and shoulder following ingestion of fatty foods 3 days ago. Over the last 24 hours, her sclera and skin turned noticeably yellow (jaundiced), her urine became dark tea-colored, and stools became clay-colored (acholic). Physical examination: fever 38.4°C; sharp arrest of inspiration on palpation of RUQ (Murphy's sign +); distinct percussion tenderness over right costal arch (Ortner's sign +); right phrenic nerve sign positive (Mussie-Gheorghievsky +).

📊 Paraclinical Laboratory Profile:

Total Bilirubin	118 μmol/L (Normal: 8.5–20.5)	Marked hyperbilirubinemia
Direct Bilirubin	94 μmol/L (Normal: 0–5.1)	>80% conjugated (mechanical)
Alkaline Phos. (ALP)	485 U/L (Normal: 44–147)	Cholestasis marker (>3x)
GGT	320 U/L (Normal: 9–48)	Marked biliary obstruction
ALT / AST	85 U/L / 72 U/L	Mild secondary hepatocyte injury
WBC	15.4 × 10⁹/L (Bands 12%)	Bacterial infection

🩻 Abdominal Ultrasonography (USG):

Gallbladder Ultrasound Calculi and Wall Thickening

USG: ACUTE CHOLECYSTITIS & CHOLEDOCHOLITHIASIS

Gallbladder wall 5.8 mm with double-halo, calculi with acoustic shadows, and CBD dilated to 11 mm.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute phlegmonous calculous cholecystitis complicated by choledocholithiasis (secondary gallstone migration into CBD), mechanical (obstructive) jaundice, and acute cholangitis (Charcot's Triad: RUQ pain + Jaundice + Fever).

Paraclinical Justification: Biochemical profile demonstrates prominent cholestasis: conjugated (direct) bilirubin constitutes >80% of total bilirubin, accompanied by a >3x elevation of ALP and GGT, with acholic stools and bilirubinuria. Ultrasound confirms acute cholecystitis criteria (thickened gallbladder wall 5.8 mm, pericholecystic halo, calculi with acoustic shadows) and common bile duct dilation (11 mm > 6-7 mm) with intraductal calculus.

Differential Diagnoses: Periampullary / Pancreatic head adenocarcinoma (Courvoisier-Terrier sign: painless palpable gallbladder + progressive jaundice, whereas in choledocholithiasis pain is prominent and gallbladder is non-distensible due to chronic fibrosis), acute viral hepatitis (AST/ALT >1000 U/L, minimal ALP rise), hemolytic jaundice (indirect bilirubin >80%, dark stools, normal ALP/GGT).

Preoperative & Emergency Management: NPO, IV fluid resuscitation, analgesics (Drotaverine, Papaverine; avoid morphine); broad-spectrum IV antibiotics covering Gram-negatives and anaerobes (Ceftriaxone 2g IV + Metronidazole 500mg IV q8h); urgent ERCP (CPGRE) with endoscopic sphincterotomy and balloon/basket stone extraction to decompress the infected biliary tree; followed by laparoscopic cholecystectomy during the same hospital admission.

Blunt Abdominal Trauma: Splenic Rupture & Hemoperitoneum

29-year-old male • Motor vehicle accident • Kehr (+) • FAST (+) • Shock

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Clinical Vignette: Patient was the restrained driver in a high-speed road traffic accident. Presents 45 minutes later complaining of severe left upper quadrant abdominal pain radiating up to the top of his left shoulder (Kehr's sign). Physical examination: pale, cold clammy extremities, agitated; pulse 128 bpm (weak, thready), BP 88/50 mmHg; left 9th-10th rib tenderness and crepitus; muscular guarding in left hypochondrium; shifting dullness in both flanks with dullness in left flank that remains fixed regardless of position (Ballance's sign).

📊 Paraclinical Laboratory Profile:

Hemoglobin (Hb)	82 g/L (down from baseline)	Acute internal hemorrhage
Hematocrit (Hct)	25% (Normal: 40–52%)	Acute blood loss
Arterial Blood Gas	pH: 7.28 • Lactate: 4.1 mmol/L	Hypoperfusion lactic acidosis
Base Deficit	-7.5 mmol/L	Class III hemorrhagic shock

🩻 Diagnostic Imaging & FAST Exam:

FAST Ultrasound Splenic Rupture Splenorenal Recess Hemoperitoneum

FAST ULTRASOUND: SPLENIC RUPTURE Hemoperitoneum

Prominent anechoic fluid strip (blood) in the splenorenal recess separating spleen and left kidney, with splenic parenchymal fracture.

FAST Ultrasound (Bedside): Positive for free fluid in Morison's pouch (hepatorenal space), splenorenal recess, and retrovesical space (Pouch of Douglas). Disruption of spleen lower pole parenchyma with subcapsular hematoma.
Diagnostic Peritoneal Lavage (Laparocentesis): Aspiration of 15 ml gross, non-clotting dark blood immediately on catheter insertion (strongly positive criteria >10 ml blood).

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Closed blunt abdominal trauma; Grade IV splenic rupture with massive hemoperitoneum; left 9th-10th rib fractures; Class III hemorrhagic-hypovolemic shock.

Paraclinical Justification: Kehr's sign (referred left shoulder pain mediated via the C3-C5 phrenic nerve due to blood and clots irritating the undersurface of the left hemidiaphragm). Bedside FAST ultrasound and DPL confirm massive hemoperitoneum. High lactate (4.1 mmol/L) and base deficit (-7.5 mmol/L) demonstrate acute tissue hypoperfusion.

Differential Diagnoses: Liver laceration (RUQ tenderness, Morison's pouch hematoma), retroperitoneal hematoma secondary to pelvic fracture, mesenteric avulsion, hollow viscous rupture (would show free air on X-ray, peritonitis).

Emergency Surgical Plan: Immediate massive transfusion protocol (1:1:1 ratio of PRBCs, Fresh Frozen Plasma, and Platelets); permissive hypotension (target SBP 80-90 mmHg until surgical hemostasis); immediate transfer to the operating theater for emergency exploratory laparotomy, splenectomy (or splenorrhaphy if viable in minor tear), evacuation of hemoperitoneum, and inspection of all four abdominal quadrants.

Thoracic Trauma: Right Tension (Valvular) Pneumothorax

33-year-old male • Crush injury • Tracheal deviation • Absent breath sounds • Shock

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Clinical Vignette: Construction worker brought to trauma bay after being pinned against a wall by a heavy beam. Patient is in extreme respiratory distress, gasping for air, intensely cyanotic, cold and diaphoretic. Vital signs: SpO2 76% on high-flow oxygen, respiratory rate 38/min, pulse 138 bpm (weak), BP 72/40 mmHg. On physical examination: trachea is visibly and palpably deviated to the left side; right hemithorax is hyper-expanded with no respiratory excursion; distended neck veins (jugular venous distension); percussion of right chest reveals tympanic hyperresonance; auscultation reveals complete absence of breath sounds over the entire right hemithorax.

📊 Paraclinical Profile & ABG:

PaO2	48 mmHg (Normal: 80–100)	Life-threatening hypoxia
PaCO2	54 mmHg (Normal: 35–45)	Acute hypercapnia / hypoventilation
pH	7.22	Mixed respiratory & lactic acidosis
Lactate	4.8 mmol/L	Obstructive shock tissue hypoxia

🩻 Chest Radiograph (Simulated Emergency):

CHEST X-RAY: RIGHT TENSION PNEUMOTHORAX

Complete right lung collapse, mediastinal shift to left, depressed right diaphragm.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Closed thoracic trauma; right-sided tension (suffocating/valvular) pneumothorax; total atelectasis of right lung; acute obstructive cardiogenic shock; acute respiratory failure.

Pathophysiological Mechanism: A one-way flap valve injury to the lung parenchyma or bronchus permits air to enter the pleural space during inspiration but prevents it from escaping during expiration. Intrapleural pressure progressively exceeds atmospheric pressure, completely collapsing the ipsilateral lung, depressing the diaphragm, and shifting the mediastinum, trachea, and heart to the contralateral side. This mechanical compression kinks the inferior and superior vena cava, obliterating venous return to the right heart, culminating in catastrophic obstructive shock and cardiac arrest!

Critical Examiner Rule: Tension pneumothorax is a STRICTLY CLINICAL DIAGNOSIS. NEVER DELAY TREATMENT TO OBTAIN A RADIOGRAPH! If the exam prompt states signs of tension pneumothorax, state immediately: "I will decompress the chest immediately before sending for an X-ray!"

Immediate Step-by-Step Life-Saving Protocol:

Immediate Needle Decompression: Insert a large-bore cannula (14–16G, ≥5 cm length) into the 2nd intercostal space in the midclavicular line on the right side, directly above the 3rd rib. (Alternative per ATLS 10th ed: 4th/5th ICS anterior axillary line). A sudden hiss of escaping air confirms successful decompression and converts tension into simple pneumothorax.
Definitive Tube Thoracostomy (Chest Drain): Insert a 28–32 Fr chest tube in the 5th intercostal space anterior to the mid-axillary line, directed posteriorly and superiorly, connected to an underwater seal drainage system (Bülau drain).

Vascular Pathology: Acute Iliofemoral Deep Vein Thrombosis

63-year-old male • Post-hip surgery • Calf swelling & cyanosis • Homans (+) • D-Dimer 4,800

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Clinical Vignette: Patient on postoperative day 6 following an elective right total hip replacement develops sudden swelling, throbbing pain, and a feeling of heavy tension in his right calf and thigh. Physical examination reveals: right lower extremity circumference is 4.5 cm larger than the left calf (measured 10 cm below tibial tuberosity); skin is tense, cyanotic, and warm; sharp pain in the calf elicited on passive forced dorsiflexion of the foot with knee extended (Homans' sign +); calf pain elicited on anteroposterior manual compression against the tibia, while lateral compression is painless (Moses' sign +); Lowenberg test positive at 70 mmHg.

📊 Paraclinical Laboratory Profile:

D-Dimer	4,850 ng/mL (Normal: <500)	Marked active fibrinolysis
Platelet Count	245 × 10⁹/L	Normal baseline
PT / INR	13.2s / 1.05	Normal coagulation profile
Serum Creatinine	88 μmol/L	Normal renal function for LMWH

🩻 Vascular Duplex Ultrasound:

DUPLEX ULTRASOUND: ACUTE FEMORAL DVT

Complete non-compressibility of CFV lumen with hypoechoic thrombus and absence of Doppler flow.

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute deep vein thrombosis (DVT) of the right iliofemoral venous system; high risk of pulmonary embolism (PE); Caprini thromboembolic score: High Risk (7 points).

Paraclinical Justification: Marked elevation of D-dimer (>4,800 ng/mL) demonstrates extensive ongoing endovascular fibrin clot turnover. Duplex Doppler ultrasound provides definitive confirmation by demonstrating the pathognomonic triad: (1) Incomplete or absent compressibility of the vein under transducer pressure, (2) Direct visualization of intraluminal thrombus, and (3) Absence of spontaneous color Doppler flow and loss of respiratory phasicity.

Differential Diagnoses: Ruptured Baker's cyst (synovial cyst of popliteal fossa, "pseudo-thrombophlebitis"), acute cellulitis/erysipelas (intense erythema with clear raised borders, high fever, normal D-dimer), superficial thrombophlebitis (palpable superficial tender indurated cord along great saphenous vein), gastrocnemius muscle tear/hematoma.

Therapeutic & Prophylactic Management:

Immediate therapeutic anticoagulation: Low Molecular Weight Heparin (LMWH - Enoxaparin 1 mg/kg SC every 12 hours) or Direct Oral Anticoagulant (DOAC: Rivaroxaban 15 mg BID × 3 weeks → 20 mg daily, or Apixaban 10 mg BID × 7d → 5 mg BID).
Limb elevation above heart level to facilitate venous return; bed rest initially until effective anticoagulation, followed by gradual mobilization with graduated class II elastic compression stockings.
If anticoagulation is strictly contraindicated (e.g. active major intracranial/GI bleed) → deploy temporary Inferior Vena Cava (IVC) filter to prevent fatal pulmonary embolism.

Generalized Fecal Peritonitis (Sigmoid Perforation)

68-year-old female • Diverticular disease • Toxic shock • Procalcitonin 24 • Lactic acidosis

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Clinical Vignette: Patient with a chronic history of sigmoid diverticular disease presents 24 hours after sudden onset of lower abdominal pain that rapidly became generalized. Physical exam: toxic Hippocratic facies (sunken eyes, pale sweaty skin, sharp nose), dry cracked "parrot" tongue; temperature 39.1°C, pulse 124 bpm, BP 82/50 mmHg; diffuse abdominal rigidity, positive Blumberg sign in all 4 quadrants, and complete silence on auscultation.

📊 Paraclinical Profile:

Procalcitonin	24.5 ng/mL (Normal: <0.5)	Severe bacterial septic shock
WBC Count	21.5 × 10⁹/L (Bands 24%)	Toxic shift-to-left
Lactate	4.6 mmol/L	Severe tissue hypoperfusion
Peritoneal Fluid	Foul-smelling turbid purulent-fecal	Free bacterial contamination

🩻 Abdominal CT Findings:

Contrast CT Perforated Diverticulitis Fecal Peritonitis

AXIAL CT: PERFORATED DIVERTICULITIS Hinchey IV Peritonitis

Sigmoid colonic perforation, extraluminal air bubbles (pneumoperitoneum), and copious dense purulent-fecal fluid collections in the pelvis.

Thick-walled sigmoid colon with extensive diverticula and focal defect; massive pneumoperitoneum with free air in Morrison's pouch and inter-loop spaces; abundant dense free fluid in the pelvis and paracolic gutters (fecal peritonitis - Hinchey Stage IV).

✅ Complete Diagnostic Formulation:

Primary Diagnosis: Acute perforated sigmoid diverticulitis (Hinchey Stage IV); acute generalized purulent-fecal peritonitis; severe septic shock; toxic paralytic ileus.

Management: Sepsis bundle resuscitation: broad-spectrum antibiotics (Piperacillin-Tazobactam or Meropenem), IV crystalloids + vasopressors (Norepinephrine), emergency laparotomy: Hartmann's Procedure (sigmoid resection, end colostomy, rectal stump closure) with copious peritoneal toilet and multiple quadrant drains.

Soft Tissue Infection: Carbuncle (Anthrax) vs Phlegmon

55-year-old diabetic male • Back of neck • Sieve-like pus • Necrosis • High ESR

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Clinical Vignette: Obese diabetic male presents with an excruciatingly painful, indurated, fiery red inflammatory mass measuring 8 × 7 cm on the back of his neck (nape). Skin is purple-black in the center with multiple necrotic pustular openings discharging thick green pus like a sieve ("honeycomb / sieve sign"). High fever 39.0°C, chills, tachycardia.

📊 Paraclinical Profile:

Blood Glucose	17.2 mmol/L (Normal: 3.9–6.1)	Severe diabetic decompensation
WBC Count	18.9 × 10⁹/L	Marked neutrophilic leukocytosis
ESR	65 mm/h	High systemic inflammation
Urine Ketones	Positive (+)	Ketoacidosis risk

🔬 Clinical Features & Terminology:

Pyloric Stenosis

Patkin's Triad

Click to flip & view maneuver

The 3 Clinical Elements:

Gastric succussion splash ("clapotage") heard >4-6h after fasting.
Visible gastric peristalsis through abdominal wall.
Asymmetric left upper quadrant gastric distension.

Section 1: Dressings, Splints & Sutures

Bandage application, Kramer splint, tourniquet protocol, simple/Blair-Donati sutures.

Section 2: Manipulations & Procedures

Blood group ABO/Rh typing, Foley catheter, local blocks, NGT, Sengstaken & Kehr tube care.

Section 3: Imaging & Endoscopy Interpretation

X-rays (pneumoperitoneum, Kloiber levels), CT (pancreatitis), USG (cholecystitis), Endoscopy (Forrest).

Section 4: Laboratory & Paraclinical Analysis

CBC left-shift, Darrow syndrome, enzymes (lipase, amylase), hypocalcemia, ABG lactate.

Section 5: Standardized Patient Clinical Examination

Physical exam signs (Murphy, Rovsing, Blumberg), complete surgical diagnosis, pre-op plan.

Cumulative Exam Score

10 / 10

Grading scale: 9–10 (Grade 10, Outstanding); 7–8 (Grade 8–9, Distinction); 5–6 (Grade 5–6, Minimum Pass); <5 (Unattested).