Solve as you are MBBS final year student giving professional exam.
Reading File
This is a comprehensive Surgery paper with MCQs (Section A), short notes (Section B), and long essays (Section C). Given the budget constraints, I'll answer all questions systematically from my medical knowledge as an MBBS final year student.
M.B.B.S. 3rd Professional (Part-2) — Surgery Paper I (2026)
SECTION A — MCQs (20 Marks)
| Q | Answer | Reasoning |
|---|---|---|
| 1 | (c) Cortisol | Post-surgical stress response → HPA axis activation → cortisol causes insulin resistance → "diabetes of injury." Glucagon also rises but cortisol is the primary driver. |
| 2 | (c) 90 days | CDC definition: SSI within 30 days of surgery (no implant) or 90 days if a prosthetic implant is placed. Appendectomy = no implant → answer is 30 days (b) ✓ |
| 3 | (a) Dobutamine | Cold shock (cardiogenic) = low CO + high SVR → need positive inotrope. Dobutamine (β1 agonist) increases CO without markedly raising SVR. Noradrenaline would worsen vasoconstriction. |
| 4 | (d) Remodeling | Remodeling phase (weeks–years): Type III collagen (weak) replaced by Type I collagen (strong, organized) → increased tensile strength. |
| 5 | (b) Echinococcus granulosus | Hydatid cyst of liver: double contour wall (pericyst + endocyst), water lily sign (ruptured germinal layer), "double contour" on USG = pathognomonic of Echinococcus granulosus. |
| 6 | (c) Inferior surface of the liver | Calot's triangle boundaries: Superiorly = inferior surface of liver (hepatic bed); Inferiorly = cystic duct; Medially = common hepatic duct. The cystic artery runs within it. |
| 7 | (a) Regional lymph node involvement | TNM: T = primary Tumor, N = regional lymph Node involvement, M = distant Metastasis. |
| 8 | (b) Tachycardia | Class II hemorrhage (750–1500 mL, 15–30% blood volume): earliest compensatory response is tachycardia. Urine output decreases later; altered mental status is Class III–IV. |
| 9 | (c) Cystoscopy | Gold standard for evaluation of painless hematuria (suspected bladder pathology/tumor) = Cystoscopy (direct visualization + biopsy). CT urography is excellent but cystoscopy allows tissue diagnosis. |
| 10 | (d) Extradural Hematoma | Lucid interval (brief unconsciousness → lucid period → rapid deterioration) is the classic hallmark of Extradural (Epidural) Hematoma due to middle meningeal artery rupture. |
| 11 | (c) 31% | Rule of Nines: Right arm = 9%, Anterior trunk = 18%, Genitalia = 1% → Total = 9 + 18 + 1 = 28%... Wait: anterior trunk = 18%, right arm = 9%, genitalia = 1% → 28%. Closest answer = (b) 28% ✓ |
| 12 | (c) Medullary Carcinoma | Medullary thyroid carcinoma (MTC) arises from parafollicular C-cells → secretes calcitonin; associated with MEN 2A and MEN 2B. |
| 13 | (c) Cooper's ligament contraction | Peau d'orange (skin dimpling/orange peel appearance) = lymphedema of skin + tethering. The hard lump causing skin puckering/tethering is from Cooper's ligament contraction/infiltration by tumor. |
| 14 | (b) Core Biopsy/FNAC | Triple Assessment = Clinical Examination + Imaging (Mammogram/USG) + Tissue sampling (Core biopsy or FNAC). |
| 15 | (a) Saphenofemoral junction incompetence | Trendelenburg test: tourniquet at SFJ, veins collapse; on releasing, immediate filling from above = SFJ incompetence. (Refill from above when tourniquet released = reflux at SFJ.) |
| 16 | (d) Vesicoureteric junction (VUJ) | Most common site for ureteric calculus to lodge = VUJ (narrowest point of ureter). PUJ is second. |
| 17 | (a) Acute Epididymo-orchitis | Prehn's sign = relief of pain on elevation of scrotum → positive in epididymo-orchitis (inflammation; elevation improves venous drainage). In testicular torsion, elevation worsens pain. |
| 18 | (b) Pre-formed cytotoxic antibodies | Hyperacute rejection (minutes–hours post-transplant) = pre-formed (pre-existing) cytotoxic antibodies (Type II hypersensitivity) against donor HLA antigens → immediate graft thrombosis. |
| 19 | (d) Carbon Dioxide (CO₂) | CO₂ is used for pneumoperitoneum in laparoscopy: highly soluble in blood, non-combustible, rapidly excreted by lungs, cheap. |
| 20 | (c) "Do no harm" | Non-maleficence = "Do no harm" (primum non nocere). Beneficence = doing good; Autonomy = patient's right to choose; Justice = fair distribution. |
SECTION B — Short Notes (40 Marks)
Q1. Shock — Definition, Classification, Clinical Features, Pathophysiology & Management of Hemorrhagic (Hypovolemic) Shock (10 marks)
Definition: Shock is a state of acute circulatory failure resulting in inadequate oxygen delivery to tissues to meet metabolic demands, leading to cellular dysfunction.
Classification of Shock:
| Type | Mechanism | Examples |
|---|---|---|
| Hypovolemic | ↓ Circulating volume | Hemorrhage, burns, dehydration |
| Distributive | Maldistribution of flow | Septic, anaphylactic, neurogenic |
| Cardiogenic | Pump failure | MI, cardiac tamponade, arrhythmia |
| Obstructive | Mechanical obstruction | Tension pneumothorax, PE, tamponade |
Pathophysiology of Hemorrhagic Shock:
- Blood loss → ↓ preload → ↓ CO → ↓ BP
- Baroreceptors activated → sympathetic response → tachycardia, vasoconstriction
- RAAS activation → aldosterone → Na/water retention
- ADH release → water retention
- Cellular hypoxia → anaerobic metabolism → lactic acidosis
- Prolonged → MODS (Multi-Organ Dysfunction Syndrome)
Clinical Features (ATLS Classification):
| Class | Blood Loss | HR | BP | RR | Urine (mL/hr) | CNS |
|---|---|---|---|---|---|---|
| I | <750 mL (<15%) | <100 | Normal | 14-20 | >30 | Normal |
| II | 750-1500 mL (15-30%) | 100-120 | Normal | 20-30 | 20-30 | Anxious |
| III | 1500-2000 mL (30-40%) | 120-140 | ↓ | 30-40 | 5-15 | Confused |
| IV | >2000 mL (>40%) | >140 | Very ↓ | >35 | <5 | Lethargic |
Management of Hemorrhagic Shock:
Primary Survey (ATLS ABCDE):
- Airway with C-spine protection
- Breathing — high-flow O₂
- Circulation — IV access (2 large-bore IVs), stop external bleeding (direct pressure)
Resuscitation:
- 2 large-bore IVs or IO access
- Warm IV fluids: Crystalloids first (Normal saline / Ringer's Lactate 1-2L bolus)
- Massive transfusion protocol: pRBC:FFP:Platelets = 1:1:1
- Permissive hypotension in penetrating trauma (target SBP 80-90 mmHg until surgical control)
- Tranexamic acid within 3 hours (CRASH-2 trial)
- Stop the bleed: surgical intervention, damage control surgery
- Monitor: urine output (0.5 mL/kg/hr), HR, BP, lactate clearance
- Warm patient (hypothermia prevention), correct acidosis and coagulopathy ("lethal triad")
Q2. Short Notes
(a) Factors that Delay Wound Healing
Local Factors:
- Infection (most common)
- Poor blood supply / ischemia
- Foreign body / necrotic tissue
- Excessive wound tension / movement
- Radiation damage
- Hematoma / seroma
Systemic Factors:
- Malnutrition (Vitamin C, zinc, protein deficiency)
- Diabetes mellitus
- Anemia
- Immunosuppression (steroids, chemotherapy)
- Old age
- Obesity
- Jaundice / uremia
- Malignancy
(b) Clinical Features and Surgical Management of Varicose Veins
Clinical Features:
- Dilated, tortuous, elongated superficial veins (long/short saphenous system)
- Aching, heaviness, leg fatigue (worse standing)
- Ankle edema
- Complications: Lipodermatosclerosis, venous eczema, varicose ulcer (gaiter area), superficial thrombophlebitis, hemorrhage, Atrophie blanche
Special Tests:
- Trendelenburg test (SFJ/SPJ incompetence)
- Tourniquet test (perforator incompetence)
- Duplex USG (gold standard for mapping)
Surgical Management:
- Trendelenburg operation (High saphenous ligation + stripping): Flush ligation at SFJ + stripping of LSV to knee
- Multiple stab avulsions (phlebectomy) of tributary varices
- Subfascial endoscopic perforator surgery (SEPS) for perforator incompetence
- Minimally invasive options: EVLA (Endovenous Laser Ablation), RFA (Radiofrequency Ablation), Foam sclerotherapy
- Post-op: Compression stockings, early ambulation
(c) Rule of Nines and Early Excision & Grafting in Burns
Rule of Nines (Wallace's Rule of Nines):
| Body Part | % TBSA |
|---|---|
| Head & Neck | 9% |
| Each upper limb | 9% (×2 = 18%) |
| Anterior trunk | 18% |
| Posterior trunk | 18% |
| Each lower limb | 18% (×2 = 36%) |
| Perineum/Genitalia | 1% |
| Total | 100% |
Modification in children: Lund & Browder chart (head is larger, legs smaller).
Importance of Early Excision & Grafting (EEG):
- Definition: Tangential/fascial excision of full-thickness (3°) and deep partial-thickness burns within 48-72 hours (ideally 3-5 days)
- Advantages:
- Removes eschar → reduces wound infection and sepsis
- Eliminates source of inflammatory mediators
- Reduces hospital stay and mortality
- Better functional and cosmetic outcome
- Decreases risk of hypertrophic scarring
- Reduces fluid/protein losses from open wound
- Followed by autografting (split-thickness skin graft — SSG) for permanent cover
(d) Principles and Advantages of Minimal Access Surgery (Laparoscopy)
Principles:
- Pneumoperitoneum: CO₂ insufflation to create working space (pressure 12-15 mmHg)
- Trocar insertion: Camera port + working ports
- Optical magnification: 10× magnification on HD monitor
- Instruments: Long-shafted, articulated instruments with electrocautery/harmonic
- Triangulation: Camera and instruments positioned at 60° angle to target
Advantages:
- ↓ incision size → less pain → ↓ analgesic requirement
- Reduced blood loss
- Shorter hospital stay ("keyhole surgery")
- Faster return to normal activity
- Fewer wound complications (infection, hernia)
- Better cosmesis (especially important in young patients)
- Magnified visualization (better view of anatomy)
- Reduced immunosuppression compared to open surgery
- Lower risk of adhesion formation
Common applications: Cholecystectomy, appendectomy, hernia repair, fundoplication, bariatric surgery, colectomy
Q3. Very Short Notes (5×2 = 10)
(a) Surgical Audit
Systematic, critical analysis of quality of surgical care by comparing outcomes against defined standards. Components: Structure (facility/staff), Process (how care delivered), Outcome (morbidity/mortality). Types: Prospective/retrospective, internal/external. Example: Confidential Enquiry into Perioperative Deaths (CEPOD). Aim: Identify deficiencies → improve patient care.
(b) Two Indications for Blood Transfusion
- Acute hemorrhagic shock (Hb <7 g/dL or >30% blood loss with hemodynamic instability)
- Symptomatic chronic anemia (Hb <8 g/dL in symptomatic patients, <10 g/dL preoperatively in high-risk cases)
(c) Marjolin's Ulcer
Malignant transformation of a long-standing scar/chronic ulcer (burn scar, venous ulcer, sinus tract) into squamous cell carcinoma (SCC). Characterized by: painless (scar tissue is anesthetic), everted edges, indurated base, no lymphadenopathy initially (lymphatics destroyed by fibrosis). Treatment: Wide local excision ± reconstruction.
(d) Secondary Thyrotoxicosis
Hyperthyroidism arising in a pre-existing multinodular goiter (MNG) due to development of autonomous hyperfunctioning nodules (Plummer's disease), often triggered by iodine excess. Distinguished from primary (Graves') by: absence of exophthalmos/pretibial myxedema, older patient, no TRAb. Treatment: Radio-iodine or surgery (preferred over antithyroids).
(e) Two Crystalloid Solutions in Fluid Resuscitation
- Normal Saline (0.9% NaCl) — isotonic; risk of hyperchloremic metabolic acidosis in large volumes
- Ringer's Lactate (Hartmann's solution) — more physiological (contains Na⁺, K⁺, Ca²⁺, lactate); preferred in hemorrhagic shock
SECTION C — Long Essays (40 Marks)
Q1. Road Traffic Accident — Unconscious with Dilated Right Pupil
(a) Glasgow Coma Scale (GCS) — Definition and Calculation (3 marks)
Definition: GCS is a standardized neurological scoring tool to objectively assess level of consciousness. Range: 3 (minimum/worst) to 15 (normal).
| Component | Response | Score |
|---|---|---|
| Eye Opening (E) | Spontaneous | 4 |
| To voice | 3 | |
| To pain | 2 | |
| None | 1 | |
| Verbal (V) | Oriented | 5 |
| Confused | 4 | |
| Inappropriate words | 3 | |
| Incomprehensible sounds | 2 | |
| None | 1 | |
| Motor (M) | Obeys commands | 6 |
| Localizes pain | 5 | |
| Withdraws | 4 | |
| Abnormal flexion (decorticate) | 3 | |
| Extension (decerebrate) | 2 | |
| None | 1 |
For this patient (unconscious): Likely E1V1M1-2 = GCS 3–4 (severe TBI). Unilateral dilated right pupil = ipsilateral uncal herniation → CN III compression.
Interpretation: GCS ≤8 = Severe TBI (requires intubation)
(b) Initial Management of Traumatic Brain Injury (4 marks)
Primary goal: Prevent secondary brain injury (hypoxia, hypotension, raised ICP)
Immediate (ATLS approach):
A — Airway: Secure airway (intubate if GCS ≤8); C-spine immobilization
B — Breathing: Ventilate; PaCO₂ target 35-40 mmHg (avoid hypocapnia)
C — Circulation: SBP >90 mmHg (hypotension doubles mortality in TBI); IV access; treat hemorrhage
D — Disability: GCS, pupils (unequal → herniation → emergency)
E — Exposure
Specific TBI Management:
- Head elevation 30° (reduces ICP)
- Osmotherapy: IV Mannitol 20% (0.25-1 g/kg) or Hypertonic saline 3% → reduces cerebral edema
- Avoid fever (target normothermia)
- Blood glucose control (avoid hypo/hyperglycemia)
- Seizure prophylaxis: IV Phenytoin/Levetiracetam (high-risk patients, 7 days)
- Neurosurgical consultation: Urgent — for dilated pupil (impending herniation)
- ICP monitoring if GCS ≤8 with CT abnormality
- DVT prophylaxis (mechanical)
- Emergency burr hole / craniotomy if extradural hematoma confirmed with herniation signs
(c) Indications for CT Scan in Head Injury (3 marks)
NICE/NEXUS criteria — CT Head indicated if:
Immediate CT (within 1 hour):
- GCS <13 at any point
- GCS <15 at 2 hours post-injury
- Suspected open/depressed skull fracture
- Any sign of basal skull fracture (hemotympanum, Battle's sign, raccoon eyes, CSF leak)
- Post-traumatic seizure
- Focal neurological deficit
- Vomiting >1 episode
- Age ≥65 years with any LOC or amnesia
- Coagulopathy (warfarin, platelets <100)
Urgent CT (within 8 hours):
- Loss of consciousness or amnesia + age ≥65, dangerous mechanism, retrograde amnesia >30 min
- Post-traumatic amnesia >10 minutes
For this patient: Unconscious + dilated right pupil → IMMEDIATE CT (herniation = neurosurgical emergency)
Q2. Short Notes (4×5 = 20)
(a) Breaking Bad News and Informed Consent for Radical Surgery in Oral Cancer
Breaking Bad News — SPIKES Protocol:
- Setting: Private, quiet room; patient + family present; sit at eye level
- Perception: "What do you already know about your condition?"
- Invitation: "Are you ready to hear the results?"
- Knowledge: Deliver news in simple, clear language — avoid jargon; gradual disclosure
- Empathy: Acknowledge emotion ("I understand this is hard to hear")
- Strategy/Summary: Outline next steps clearly
Informed Consent for Radical Surgery:
- Must be voluntary, competent, and informed
- Explain: Diagnosis (oral carcinoma), proposed procedure (e.g., composite resection + neck dissection ± reconstruction), alternatives (radiation, palliative), risks (bleeding, infection, fistula, dysphagia, cosmetic deformity), benefits, prognosis without surgery
- Allow patient to ask questions
- Written consent signed by patient + witness
- Special considerations: Mental capacity, language barrier (use interpreter), next of kin in incapacity
(b) Diagnostic Approach to a Solitary Thyroid Nodule
Initial Assessment:
- History: Age/sex (malignancy risk ↑ in males, extremes of age), dysphagia, hoarseness, rapid growth, radiation exposure, family history (MTC/MEN)
- Examination: Size, consistency (hard = malignant), fixity, cervical lymphadenopathy, tracheal deviation
Investigations:
- TFTs (TSH, T3, T4) — to exclude functional adenoma
- USG neck (first line imaging): ATA risk stratification — hypoechoic, microcalcifications, irregular margins, taller-than-wide shape, ↑ vascularity → suspicious
- FNAC (Fine Needle Aspiration Cytology) — gold standard for tissue diagnosis; Bethesda classification (I–VI)
- Radionuclide scan (99mTc): Cold nodule (hypofunctioning) → higher malignancy risk; Hot nodule → benign
- CT/MRI neck/chest: For large nodules, substernal extension, lymphadenopathy
- Serum calcitonin: If MTC suspected (MEN family history)
- Molecular markers (BRAF, RAS, RET/PTC): If Bethesda III/IV on FNAC
Bethesda → Management:
- I (non-diagnostic) → Repeat FNAC
- II (benign) → Follow-up USG
- III/IV (atypia/follicular) → Molecular testing / lobectomy
- V/VI (suspicious/malignant) → Total thyroidectomy
(c) Clinical Features and Management of Buerger's Disease (TAO)
Buerger's Disease (Thromboangiitis Obliterans):
- Segmental, non-atherosclerotic, inflammatory vasculitis affecting small and medium vessels of hands and feet
- Strongly associated with heavy tobacco smoking (pathognomonic association)
- Predominantly young males, 20-40 years
Clinical Features:
- Intermittent claudication (calf, arch of foot, forearm)
- Rest pain (later stage)
- Ischemic ulcers at tips of digits (painful, punched-out)
- Gangrene of digits
- Raynaud's phenomenon (cold sensitivity)
- Superficial migratory thrombophlebitis (50% — pathognomonic feature)
- Allen's test positive (radial/ulnar involvement)
Investigation: Duplex USG, Arteriography (corkscrew collaterals — characteristic), ABI
Management:
- Complete cessation of smoking (most important — only proven intervention to halt progression)
- Vasodilators: Iloprost (prostacyclin analog) IV — improves healing
- Anticoagulants: Aspirin ± low-dose warfarin
- Calcium channel blockers: Nifedipine (for Raynaud's)
- Sympathectomy (lumbar/cervical): For rest pain, vasospasm, non-healing ulcers
- Debridement of ulcers, wound care
- Amputation: Last resort for wet gangrene / intractable pain
(d) Immunosuppression in Renal Transplantation
Goal: Prevent rejection while minimizing infection/malignancy risk
Phases:
- Induction (peri-operative): High-dose steroids ± basiliximab (IL-2 receptor antagonist) or anti-thymocyte globulin (ATG)
- Maintenance (long-term triple therapy):
- Calcineurin inhibitor: Tacrolimus (preferred) or Cyclosporine — inhibits IL-2 production, blocks T-cell activation
- Antiproliferative: Mycophenolate mofetil (MMF) — inhibits purine synthesis → blocks lymphocyte proliferation
- Steroids: Prednisolone (tapered over time)
- Rejection treatment:
- Acute cellular: High-dose IV methylprednisolone ("pulse steroids")
- Steroid-resistant: ATG
- Antibody-mediated: Plasmapheresis + IVIG + rituximab
Complications of immunosuppression:
- Infection (opportunistic — CMV, PCP, fungal)
- Malignancy (lymphoma, skin cancer)
- Nephrotoxicity (cyclosporine, tacrolimus)
- Hypertension, diabetes (steroids/tacrolimus)
- Osteoporosis
Q3. Very Short Notes (5×2 = 10)
(a) The "Golden Hour" in Trauma
Coined by Dr. R. Adams Cowley: the first 60 minutes after major trauma are critical — definitive hemorrhage control and resuscitation within this period dramatically improves survival. Physiological basis: Before irreversible cellular injury from hypoperfusion occurs. Drives pre-hospital care systems, trauma center designation, and ATLS principles.
(b) Two Complications of Thyroidectomy
| Complication | Mechanism |
|---|---|
| Recurrent Laryngeal Nerve (RLN) injury | Unilateral: hoarseness; Bilateral: respiratory distress/stridor (emergency) |
| Hypoparathyroidism (Hypocalcemia) | Inadvertent removal/devascularization of parathyroid glands → ↓ PTH → hypocalcemia → tetany, Chvostek's sign, Trousseau's sign |
(Others: thyroid storm, hemorrhage, tracheomalacia)
(c) Day Case Surgery
Surgical procedure in which the patient is admitted, operated upon, and discharged home on the same day (within 12-24 hours), without overnight hospital stay. Requirements: ASA I-II patient, adequate home support, uncomplicated procedure, competent anesthetic. Examples: Hernia repair, varicose veins, cystoscopy, minor excisions, circumcision. Advantages: Cost-effective, reduced hospital-acquired infection risk, patient satisfaction.
(d) Two Screening Methods for Breast Cancer
- Mammography — Gold standard screening; 2-view (CC + MLO); recommended every 2 years in women aged 40-74 (or 50-69 per UK NHS); detects microcalcifications and masses <1 cm
- Clinical Breast Examination (CBE) — Monthly self-breast examination (SBE) + annual CBE by clinician; particularly useful in low-resource settings and dense breasts
(Breast USG used in young women with dense breasts; MRI for high-risk/BRCA-positive)
(e) Sentinel Lymph Node
The first lymph node to receive lymphatic drainage from a primary tumor. Its status predicts the likelihood of regional lymph node metastasis. Sentinel Lymph Node Biopsy (SLNB): Radiolabeled colloid (99mTc) ± patent blue dye injected peritumorally → gamma probe/visual identification of sentinel node → biopsy. If negative → no axillary clearance needed (avoids lymphedema). If positive → axillary lymph node dissection. Widely used in breast cancer and melanoma staging.
All answers written as per standard surgical textbooks (Bailey & Love, Sabiston) and ATLS/UICC guidelines. Diagrams for Shock classification, Rule of Nines, and GCS would be drawn in the actual answer book.
This is a shared conversation. Sign in to Orris to start your own chat.