I now have sufficient information to answer all questions comprehensively. Here are the complete answers:
Complete MCQ Answers with Explanations
Q10. Laparoscopic liver resection - hypotension + drop in EtCO2 + no ventilator circuit break + minimal bleeding + ST changes
Answer: (E) Release (desufflate) pneumoperitoneum
This is venous gas (CO2) embolism - a recognized complication during laparoscopic liver surgery when CO2 enters an open hepatic vein. The classic triad is:
- Sudden hypotension
- Drop in end-tidal CO2 (gas lodges in pulmonary vasculature, reducing perfusion)
- ST changes (right heart strain/ischemia)
The immediate step is releasing the pneumoperitoneum to stop further CO2 entrainment. Other steps include placing the patient in left lateral decubitus Trendelenburg, aspiration via central line, and 100% O2. Note: unlike air embolism, CO2 embolism may transiently increase EtCO2 initially before it drops. (Morgan & Mikhail's Clinical Anesthesiology)
Q11. Malignant hyperthermia - laparoscopic cholecystectomy, hyperthermia + elevated EtCO2, treated with dantrolene
Answer: (D) It may present as late as 24 hours after anesthesia
Key facts about malignant hyperthermia (MH):
- (A) False - MH is autosomal dominant (not recessive), though multifactorial inheritance also occurs (Bradley & Daroff's Neurology)
- (B) False - Diagnosis is clinical; genetic analysis and muscle biopsy (caffeine-halothane contracture test) are confirmatory but not required for diagnosis
- (C) False - MH is more common in younger patients/children, not elderly
- (D) True - Delayed MH can occur up to 24 hours after anesthesia, especially with volatile agents that remain in tissue
- (E) False - With dantrolene treatment, mortality is ~5-10%; without it, historical mortality was up to 80%
Q12. Benzocaine spray - headache, dyspnea, SpO2 85%, SaO2 80%, PaO2 150 mmHg
Answer: (B) Intravenous methylene blue
This is classic methemoglobinemia from benzocaine. The key diagnostic clue is the discordance: high PaO2 (150 mmHg - oxygen is dissolving normally) but low SaO2/SpO2 (methemoglobin cannot carry O2 and absorbs light at a wavelength that falsely reads ~85% on pulse oximetry). Treatment is IV methylene blue 1-2 mg/kg of a 1% solution. (Morgan & Mikhail's Clinical Anesthesiology; Yamada's Textbook of Gastroenterology)
Q13. 19-year-old with painful, swollen, red lateral nail fold - nail biting history, fever 103°F
Answer: (E) Incision at lateral nail fold plus oral antibiotics covering skin flora AND anaerobic bacteria
This is paronychia - infection of the nail fold. Key points:
- Nail biters harbor oral flora including anaerobic bacteria (Bacteroides, Fusobacterium, Eikenella)
- This distinguishes from typical paronychia which only needs skin flora coverage (Staph aureus)
- Because nail biting introduces mouth organisms, anaerobic coverage is required in addition to standard skin flora coverage
- Incision is at the lateral nail fold (not mid-pulp, which would be for felon)
- Fever 103°F indicates a significant infectious process requiring drainage + antibiotics (Miller's Review of Orthopaedics)
Q14. 2 cm lesion upper lip, shiny pearly nodule with rolled borders - most common skin cancer
Answer: (D) Basal cell carcinoma
BCC is the most common skin cancer overall. Classic description: pearly/translucent nodule with rolled (raised) borders, telangiectasia, often with central ulceration ("rodent ulcer"). However, note that BCC is rare on the lips - this is an important distinction. The upper lip is an unusual location; SCC is more common on the lower lip. The question emphasizes "pearly, rolled borders" which classically describes BCC. The location "above the vermillion border" (facial skin, not mucosa) makes BCC plausible.
Q15. 45-year-old shepherd, bottom lip lesion, red and brown plaque
Answer: (C) Squamous cell carcinoma
The lower lip is the classic site for SCC due to chronic sun exposure (UV radiation), which is highly relevant for an outdoor worker (shepherd). SCC of the lip presents as an indurated red/brown plaque or ulcer. BCC rarely occurs on the lip vermillion. Actinic keratosis would be the precursor lesion but an established plaque in an anxious patient warrants SCC diagnosis.
Q18. 3-cm full-thickness cheek wound from flash burn - best skin graft
Answer: (A) Full thickness from behind the ear (post-auricular)
For facial reconstruction, color and texture match are paramount. Full-thickness skin grafts (FTSGs) are preferred over split-thickness for the face as they:
- Contract less
- Provide better cosmetic outcome
- Better match facial skin texture/color
The post-auricular (behind the ear) skin is the best match for facial skin in terms of color, texture, and thickness - it is the classic donor site for small full-thickness facial grafts.
Q19. Redness, pain, fluctuance in intergluteal cleft 4 cm posterior to anus, with hair
Answer: (B) Incision and drainage lateral to the intergluteal cleft
This is an acute pilonidal abscess. Key management principle:
- Acute phase: incision and drainage
- The I&D should be performed lateral/off-midline to the intergluteal cleft (not in the cleft itself)
- Off-midline drainage heals faster with less recurrence than midline incision
- En bloc excision and flap reconstruction are for chronic/recurrent disease, not acute abscess
(Textbook of Family Medicine; Roberts & Hedges' Clinical Procedures)
Q20. Most common organism causing burn sepsis
Answer: (E) Pseudomonas
While early burn wound infections (first 48-72 hours) are dominated by Gram-positive organisms (Staph aureus, Strep), Pseudomonas aeruginosa is the most common cause of burn sepsis overall, particularly after the first few days. It colonizes burn wounds, is resistant to many antibiotics, and is the leading cause of mortality from burn infection. Some sources cite Staph aureus as early and Pseudomonas as later/overall - but for burn sepsis specifically, Pseudomonas is the classic answer.
Q21. Electrical burn worker - discolored urine in minimal quantity, contact burns hands/feet/perineum, normal EKG
Answer: (B) Rhabdomyolysis
Electrical injuries cause massive rhabdomyolysis - electrical current destroys muscle along its path between entry and exit points. Myoglobin released from destroyed muscle is excreted by kidneys, causing dark/cola-colored urine (myoglobinuria). Oliguria suggests renal impairment from myoglobin precipitation in tubules. Management: aggressive IV fluid resuscitation to maintain urine output >100 mL/hr, +/- urinary alkalinization.
Q22. Respiratory distress - trachea deviated LEFT, absent breath sounds on RIGHT, tachycardia, feeble pulses
Answer: (C) Immediate needle thoracotomy at 2nd intercostal space
This is tension pneumothorax - the classic triad of:
- Tracheal deviation away from affected side (deviated LEFT = tension on RIGHT)
- Absent breath sounds on the affected side (RIGHT)
- Hemodynamic instability (tachycardia, feeble pulses)
Immediate treatment is needle decompression at the 2nd intercostal space, midclavicular line on the affected (right) side - this is life-saving and must not be delayed for X-ray. Followed by definitive chest tube insertion.
Q25. 8 cm from anal verge, pedunculated swelling, suspected carcinoma rectum - best test for early staging
Answer: (A) Endoluminal ultrasound (EUS/TRUS)
For local staging of rectal carcinoma, endoluminal (transrectal/endorectal) ultrasound is the best modality for:
- T-stage (depth of invasion through bowel wall layers)
- N-stage (perirectal lymph nodes)
- It is superior to CT for local T/N staging of early rectal cancer
- CT is better for distant metastasis (M-stage)
- PET-CT is for recurrence/metastasis
- CEA is a tumor marker, not a staging tool
- Colonoscopy is diagnostic, not staging
Q26. 32-year-old with thyroid lymphoma - disease confined to thyroid (no systemic spread)
Answer: (B) Radiotherapy alone
Primary thyroid lymphoma (almost always diffuse large B-cell lymphoma or MALT lymphoma) that is localized to the thyroid (Stage IE) is treated with:
- Localized disease (MALT type): radiotherapy alone is the standard
- More aggressive types (DLBCL): chemoradiotherapy (R-CHOP + RT)
- Surgery plays a limited role (mainly for diagnosis/decompression)
Given the question specifies "no disease elsewhere" and asks for treatment, radiotherapy alone for localized thyroid lymphoma is the standard answer in surgical exams.
Q27. 12-year-old with road rash - skin rubbed off on road
Answer: (C) Gently brush the wound and irrigate with normal saline
This is a traumatic abrasion/degloving from a road accident. The immediate management is:
- Thorough mechanical cleansing to remove embedded road debris (gravel, dirt, asphalt)
- Gentle brushing and irrigation with normal saline
- If debris is not removed, it becomes tattooed into healing skin permanently
- The wound itself does not require grafting acutely - clean abrasions generally heal by secondary intention
- Grafting decisions are made after wound assessment
Q28. 55-year-old farmer - longstanding mole changing in size, shape, color; crusting and bleeding; no lymphadenopathy
Answer: (C) Melanoma
Classic presentation using the ABCDE rule of melanoma:
- Asymmetry, Border irregularity, Color change, Diameter increase, Evolution (change over time)
- Crusting and bleeding are signs of malignant transformation
- Longstanding mole (pre-existing nevus) transforming
- Farmer = chronic UV exposure (risk factor)
- No palpable lymph nodes does not exclude melanoma at this stage
- KA (keratoacanthoma) grows rapidly de novo; BCC is pearly; SCC doesn't typically arise from a mole
Q32. Stress response - which statement is FALSE?
Answer: (D) The changes cannot be modified
Stress response facts:
- (A) True - it IS graded (proportional to severity of injury)
- (B) True - metabolism and nitrogen excretion correlate with degree of stress
- (C) True - physiological, metabolic, and immunological changes all occur
- (D) FALSE - The changes CAN be modified (by analgesia, anesthesia, nutritional support, beta-blockers, etc.)
- (E) True - the pituitary (via ACTH, ADH, GH) initiates the integrated neuroendocrine response
Q33. Preventable factors of mortality in high-risk patients
Answers: (B) Insufficient patient monitoring, (C) Lack of early intervention as complications develop, (E) Inadequate critical care facilities
- (A) Pain and (D) Advanced age are NOT preventable factors - pain can be managed but is not a direct cause of mortality; age cannot be changed
- The preventable factors are system/process failures: inadequate monitoring, delayed intervention, inadequate critical care resources
Q34. Water homeostasis - TRUE statements
Answers: (B) Two-thirds of TBW is intracellular, (C) An average adult has approx. 3 L of plasma, (E) Water moves freely across cell membrane
- (A) False - TBW in adult male is 60% of body weight (not 70%)
- (B) True - ICF = 2/3 of TBW; ECF = 1/3 of TBW
- (C) True - Plasma volume ~3L (part of the ~15L ECF)
- (D) False - TBW is LOWEST in elderly and obese individuals (more fat, less water); highest in lean young males
- (E) True - water moves freely via osmosis through aquaporins
Q35. Markers of malnutrition for TPN consideration
Answers: (A) Albumin, (C) Transthyretin (prealbumin), (D) Skin fold thickness, (E) Weight loss
- Albumin (half-life ~21 days) - marker of chronic malnutrition
- Transthyretin/prealbumin (half-life ~2 days) - more sensitive marker of acute malnutrition
- Skin fold thickness - anthropometric measure of fat stores
- Weight loss >10% of body weight is significant
- (B) Urea - reflects protein catabolism/renal function, not a direct marker of malnutrition status
Q36. True statements about 0.9% normal saline
Answers: (B) It contains equal molar amounts of sodium and chloride, (D) It contains no dextrose
- (A) False - Normal saline has Na+ 154 mEq/L; plasma Na+ is 135-145 mEq/L. They are NOT identical
- (B) True - 0.9% NaCl has 154 mmol/L Na+ AND 154 mmol/L Cl- (equimolar)
- (C) False - Normal saline contains NO potassium
- (D) True - It contains no dextrose (unlike D5W or D5NS)
- (E) False - Normal saline is NOT the premier fluid for hypovolemia; it causes hyperchloremic metabolic acidosis with large volumes; balanced crystalloids (Lactated Ringer's) are preferred
Q37. FALSE statements about anastomosis
Answers: (A) Large-bowel anastomosis must be done only by one-layer technique, (C) Synthetic polymers are to be used for intestinal anastomosis
- (A) False - Large bowel anastomosis can be performed with either one-layer or two-layer technique; both are acceptable
- (B) True - tension-free anastomosis is mandatory
- (C) False - Both synthetic (polyglycolic acid, PDS) AND natural (catgut) sutures are used; the statement as written implies only synthetic should be used which is misleading
- (D) True - In vascular anastomosis, the needle passes from intima outward (inside-out) to prevent intimal dissection
- (E) True - Non-absorbable monofilament (polypropylene) is used for vascular anastomosis
Q38. Advantages of minimal access surgery (laparoscopy)
Answers: (A) Decrease in wound size, (B) Decreased postoperative pain, (D) Improved vision
- (A) True - smaller incisions
- (B) True - less tissue trauma = less pain
- (C) False - Operating time is often LONGER with laparoscopy (more complex setup, longer learning curve)
- (D) True - magnified, high-definition camera provides better visualization than open surgery in some cases
- (E) False - Operating theatre costs are actually HIGHER for laparoscopy (expensive equipment, disposables)
Q39. Gases used to provide pneumoperitoneum
Answers: (B) Carbon dioxide, (C) Helium
- CO2 is the standard gas - highly soluble, non-combustible, rapidly absorbed
- Helium has been used as an alternative (less physiologic effects on acid-base, useful in patients with pulmonary disease)
- (A) Methane - not used (flammable, dangerous)
- (D) Nitrous oxide - historically used but abandoned (supports combustion, risk with electrocautery)
- (E) Argon - not used for pneumoperitoneum
Q40. Complications of creating pneumoperitoneum
Answers: (A) Bleeding, (B) Bowel injuries, (C) Gas dissection within the abdominal wall, (D) Puncture of blood vessels, (E) Omental tear
All of the above are recognized complications of Veress needle insertion or trocar placement for pneumoperitoneum creation. Gas dissection (subcutaneous emphysema) is a specific and common complication.
Q41. Life and death decisions - TRUE statements
Answers: (B) Decision to withhold treatment should be taken with another senior clinician and recorded, (C) In palliation for pain in advanced malignancy, a potentially lethal dose of analgesia is appropriate
- (A) False - Surgeons are NOT always obliged to provide life-sustaining treatment; futile treatment, patient advance directives, and DNR orders exist
- (B) True - Withholding treatment requires collegial decision-making and detailed documentation
- (C) True - The doctrine of double effect - adequate pain relief in terminal malignancy is ethically appropriate even if it may hasten death
- (D) False - Confidentiality is NOT absolute; it can be breached to prevent serious harm to others
Q42. FALSE statements in orthopedic imaging
Answers: (A) Synovitis can be detected by plain X-ray, (F) Plain film of a joint is best for suspected acute joint infection
- (A) False - Synovitis is a soft-tissue finding detected by MRI or ultrasound, NOT plain X-ray
- (B) True - MR arthrography IS ideal for articular cartilage damage
- (C) True - MRI IS ideal for staging malignant bone tumors
- (D) True - X-ray is the first investigation for destructive bone lesions
- (E) True - US IS used to examine soft tissue masses
- (F) False - Plain film shows only late changes (joint space narrowing, periosteal reaction); joint aspiration and synovial fluid culture are the gold standard for acute septic arthritis
Q43. Antibiotic prophylaxis NOT considered
Answer: (E) Previous cholecystectomy
Antibiotic prophylaxis (for endocarditis or procedural infection) IS indicated for:
- (A) Prosthetic heart valves - high risk for endocarditis
- (B) Previous endocarditis - highest risk group
- (C) Severe neutropenia - immunocompromised
- (D) Chronic liver disease undergoing variceal sclerotherapy - risk of bacteremia/SBP
(E) Previous cholecystectomy - a prior cholecystectomy confers no ongoing infection risk and does not require prophylaxis.
Q44. NOT risk factors for post-ERCP pancreatitis
Answer: (C) Increased bilirubin
Risk factors for post-ERCP pancreatitis (PEP) include:
- (A) Young age - TRUE risk factor
- (B) Difficult cannulation - TRUE risk factor
- (D) Pancreatic sphincterotomy - TRUE risk factor
- (E) Balloon dilation of biliary sphincter - TRUE risk factor
- (C) Increased bilirubin - Elevated bilirubin is actually associated with lower risk of PEP (dilated CBD from obstruction makes cannulation easier and sphincter is already open)
Q45. TRUE statements about immunohistochemistry (IHC)
Answers: (B) It relies on the use of a specific antibody, (C) It helps to determine cell type and differentiation, (D) It has a role in determining treatment and prognosis
- (A) Partially true but misleading - IHC is more than "just a special staining method"; it specifically uses antigen-antibody reactions (making B the better answer)
- (B) True - IHC uses specific antibodies against cellular antigens (e.g., ER/PR in breast cancer)
- (C) True - Used to classify tumor type (cytokeratin for carcinoma, S-100 for melanoma, CD markers for lymphoma)
- (D) True - e.g., HER2 status guides trastuzumab therapy; ER/PR guides hormonal therapy
Q46. Surgical risks in a diabetic patient
Answers: (A) Infection, (B) Myocardial infarction, (D) Poor wound healing
- (A) True - Hyperglycemia impairs neutrophil function, complement, and opsonization
- (B) True - Diabetics have accelerated atherosclerosis and autonomic neuropathy (silent MI risk is high)
- (C) Pressure sore - while diabetics are at higher risk due to neuropathy, this is not a primary surgical risk per se
- (D) True - Impaired collagen synthesis, microvascular disease, and neuropathy all impair wound healing
- (E) Pain control - diabetics may have altered pain perception (neuropathy) but "pain control" is not a surgical risk in the classic sense
Q47. Roux-en-Y for carcinoma stomach localized to:
Answer: (D) Gastroesophageal junction
Roux-en-Y esophagojejunostomy (reconstruction) is performed after total gastrectomy, which is the operation of choice for GE junction (cardia) and upper gastric cancers after neoadjuvant chemotherapy. For pyloric/distal tumors, Billroth I or II reconstruction is more common. Roux-en-Y is specifically the reconstruction of choice when esophageal anastomosis is required.
Q48. Reducing unpleasant dreams/emergence phenomena from ketamine
Answer: (C) Midazolam
Ketamine causes dissociative anesthesia and is associated with vivid dreams, hallucinations, and emergence delirium. Benzodiazepines (midazolam, diazepam) are the most effective agents to reduce this incidence by providing anxiolysis and amnesia. Droperidol has also been used but midazolam is the primary agent in current practice.
Q49. IV anesthetic associated with highest incidence of nausea and vomiting
Answer: (B) Etomidate
- Etomidate has the highest incidence of PONV among IV induction agents (~30-40%)
- Propofol actually has antiemetic properties and reduces PONV
- Ketamine has moderate emetic potential
- Midazolam has minimal emetic potential and mild antiemetic properties
Q50. Hyperdense on CT scan
Answer: (B) Bones, fresh blood
CT density scale:
- Hyperdense (bright/white): bone, fresh/acute blood (hyperdense due to globin protein), calcifications, contrast, foreign bodies
- Isodense: brain parenchyma, subacute blood
- Hypodense (dark): fat, air, edema, old infarcts, CSF
- Gas/fluid/swelling = hypodense; brain parenchyma = isodense
Q51. Femoral hernia passes:
Answer: (D) Medial to femoral vein
The femoral canal (through which femoral hernias pass) lies:
- Medial to the femoral vein
- Lateral to the lacunar ligament
- Below the inguinal ligament
- Posterior to the inguinal ligament (NOT anterior)
- Posterior to Cooper's ligament (NOT posterior to it)
The boundaries of the femoral canal: medially = lacunar ligament; laterally = femoral vein; anteriorly = inguinal ligament; posteriorly = Cooper's (pectineal) ligament.
Q52. 5x5 cm sacral ulcer with slough, tissue loss through sacral fascia
Answer: (D) Stage 4
Pressure ulcer staging:
- Stage 1: Intact skin, non-blanchable erythema
- Stage 2: Partial thickness, shallow open ulcer/blister
- Stage 3: Full thickness skin loss, subcutaneous fat visible, no fascia exposure
- Stage 4: Full thickness tissue loss with exposed bone, tendon, or fascia
- Unstageable: covered by slough/eschar (cannot determine depth)
Tissue loss through sacral fascia = Stage 4.
Q53. Hemorrhage 2 hours after cholecystectomy
Answer: (C) Reactionary hemorrhage
Types of hemorrhage by timing:
- Primary: occurs at time of operation
- Reactionary: within 24 hours of surgery (usually 4-6 hours) - occurs as blood pressure normalizes, dislodging clots from inadequately ligated vessels
- Secondary: 7-14 days post-op, due to infection/sepsis eroding vessel walls
2 hours post-op = reactionary hemorrhage (classic timing).
Q54. Metabolic disturbance in Infantile Hypertrophic Pyloric Stenosis (IHPS)
Answer: (D) Hypochloremic hypokalemic metabolic alkalosis
In IHPS, repeated non-bilious projectile vomiting causes loss of:
- HCl (hydrochloric acid) from gastric juice → hypochloremia + metabolic alkalosis
- The kidney initially compensates by excreting HCO3- with Na+, but as volume depletion worsens, it prioritizes Na+ retention over acid-base balance
- K+ is lost in urine (aldosterone-driven Na+/K+ exchange) and via vomiting → hypokalemia
- Paradoxical aciduria occurs despite alkalosis (kidney excretes H+ to save Na+ and K+)
The classic description: hypochloremic, hypokalemic metabolic alkalosis with paradoxical aciduria.
Summary Answer Key
| Q | Answer |
|---|
| Q10 | E - Desufflate pneumoperitoneum |
| Q11 | D - May present up to 24 hrs post-anesthesia |
| Q12 | B - IV methylene blue |
| Q13 | E - Incision lateral nail fold + antibiotics for skin flora AND anaerobes |
| Q14 | D - Basal cell carcinoma |
| Q15 | C - Squamous cell carcinoma |
| Q18 | A - Full thickness from behind the ear |
| Q19 | B - I&D lateral to intergluteal cleft |
| Q20 | E - Pseudomonas |
| Q21 | B - Rhabdomyolysis |
| Q22 | C - Immediate needle thoracotomy 2nd ICS |
| Q25 | A - Endoluminal ultrasound |
| Q26 | B - Radiotherapy alone |
| Q27 | C - Brush and irrigate |
| Q28 | C - Melanoma |
| Q32 | D - Changes cannot be modified (FALSE) |
| Q33 | B, C, E |
| Q34 | B, C, E |
| Q35 | A, C, D, E |
| Q36 | B, D |
| Q37 | A, C |
| Q38 | A, B, D |
| Q39 | B, C |
| Q40 | A, B, C, D, E |
| Q41 | B, C |
| Q42 | A, F |
| Q43 | E - Previous cholecystectomy |
| Q44 | C - Increased bilirubin |
| Q45 | B, C, D |
| Q46 | A, B, D |
| Q47 | D - Gastroesophageal junction |
| Q48 | C - Midazolam |
| Q49 | B - Etomidate |
| Q50 | B - Bones, fresh blood |
| Q51 | D - Medial to femoral vein |
| Q52 | D - Stage 4 |
| Q53 | C - Reactionary hemorrhage |
| Q54 | D - Hypochloremic hypokalemic metabolic alkalosis |
