COMSAE Phase 2 BSA Form 115i – Comprehensive
Exam with Questions, Answers and Rationales
2026/2027 Update
Question 1: Cardiology / Emergency Medicine
A 68-year-old man presents to the emergency department with acute, crushing substernal chest
pain radiating to his left arm. An electrocardiogram (ECG) demonstrates significant ST-segment
elevations in leads II, III, and aVF.
Which coronary artery is most likely occluded?
A. Left anterior descending artery
B. Left circumflex artery
C. Diagonal branch artery
D. Right coronary artery
Correct Answer: D. Right coronary artery
Rationale:
Inferior wall myocardial infarctions classically present with ST-segment elevations in leads II,
III, and aVF. In the majority of individuals, the right coronary artery (RCA) supplies the inferior
wall of the left ventricle as well as the sinoatrial and atrioventricular nodes. Left anterior
descending (LAD) occlusions present with anterior changes (V1–V4), and left circumflex (LCx)
lesions typically affect the lateral leads (I, aVL, V5–V6).
Question 2: Pulmonology / Critical Care
A 65-year-old man with a long-standing history of chronic obstructive pulmonary disease
(COPD) presents with worsening dyspnea and increased sputum purulence. An arterial blood gas
(ABG) analysis shows pH 7.32, PaCO₂ 60 mmHg, and PaO₂ 55 mmHg on room air.
What is the best immediate next step in management?
A. High-dose IV steroids only
B. Noninvasive positive pressure ventilation (BiPAP)
, C. Immediate endotracheal intubation
D. Intravenous loop diuretics
Correct Answer: B. Noninvasive positive pressure ventilation (BiPAP)
Rationale:
This patient is experiencing acute hypercapnic respiratory failure secondary to a COPD
exacerbation. For patients with acute-on-chronic hypercapnic respiratory failure (pH < 7.35 and
PaCO₂ > 45 mmHg), a trial of noninvasive positive pressure ventilation (BiPAP) is the first-line
intervention. It reduces the work of breathing, improves alveolar ventilation, corrects pH, and
decreases the need for invasive mechanical ventilation unless absolute contraindications or
failure occur.
Question 3: Endocrinology
A 22-year-old woman presents to her primary care physician complaining of progressive heat
intolerance, unintentional weight loss, palpitations, and fine tremors of her hands. Laboratory
evaluation reveals a suppressed thyroid-stimulating hormone (TSH) level and significantly
elevated free thyroxine (T4).
What is the most likely underlying diagnosis?
A. Hashimoto thyroiditis
B. Graves disease
C. Subacute granulomatous thyroiditis
D. Secondary hypothyroidism
Correct Answer: B. Graves disease
Rationale:
The clinical presentation of hyperthyroidism (heat intolerance, weight loss, tremor, palpitations)
combined with low TSH and high free T4 points toward primary hyperthyroidism. In a young
woman, Graves disease is the most frequent cause, driven by thyroid-stimulating
immunoglobulins (TSI) that bind to and activate TSH receptors. Hashimoto thyroiditis typically
results in primary hypothyroidism (high TSH, low T4).
Question 4: Gastroenterology / Pediatrics
,A newborn term infant fails to pass meconium within the first 48 hours of life. Abdominal
radiographs show dilated loops of bowel, and a contrast enema reveals a distinct transition zone
between a narrowed distal rectosigmoid colon and a dilated proximal colon.
Which of the following is the most likely diagnosis?
A. Necrotizing enterocolitis
B. Hirschsprung disease
C. Hypertrophic pyloric stenosis
D. Meconium ileus
Correct Answer: B. Hirschsprung disease
Rationale:
Failure to pass meconium within 48 hours accompanied by a transition zone on contrast enema
strongly indicates Hirschsprung disease (congenital aganglionosis). The absence of ganglion
cells in the Meissner and Auerbach plexuses results in a tonic contraction of the affected bowel
segment, functional obstruction, and proximal dilation.
Question 5: Nephrology / Physiology
A patient with severe acute pancreatitis develops sudden, painful carpopedal spasms and perioral
numbness. Laboratory testing demonstrates a decreased total serum calcium level.
What is the primary pathological mechanism driving hypocalcemia in this setting?
A. Increased renal calcium excretion
B. Suppression of parathyroid hormone synthesis
C. Fat saponification within necrotic peripancreatic tissue
D. Accelerated bone mineralization
Correct Answer: C. Fat saponification within necrotic tissue
Rationale:
Acute pancreatitis leads to the enzymatic leakage and activation of pancreatic lipase, causing fat
necrosis of the peripancreatic and retroperitoneal adipose tissue. Free fatty acids released during
lipolysis bind to calcium ions, forming insoluble calcium soaps (saponification). This process
sequesters systemic calcium, frequently resulting in marked hypocalcemia.
, Question 6: Urology
A 45-year-old man presents with acute-onset high fever, chills, low back pain, dysuria, and
perineal discomfort. Digital rectal examination reveals a markedly tender, warm, and boggy
prostate gland. Urinalysis shows pyuria and bacteriuria.
What is the most likely diagnosis?
A. Benign prostatic hyperplasia (BPH)
B. Acute bacterial prostatitis
C. Acute epididymitis
D. Interstitial cystitis
Correct Answer: B. Acute bacterial prostatitis
Rationale:
The classic triad of systemic infection signs (fever, chills), irritative voiding symptoms (dysuria),
and localized perineal/pelvic pain with a warm, exquisitely tender prostate on physical exam
defines acute bacterial prostatitis. Gram-negative rods (most commonly Escherichia coli) are the
typical causative agents. Massage of an acutely inflamed prostate should be strictly avoided due
to the risk of inducing bacteremia.
Question 7: Rheumatology / Immunology
A 30-year-old woman visits her physician due to generalized fatigue, joint stiffness in her hands,
and a malar rash across her cheeks and bridge of the nose that worsens after sun exposure.
Laboratory investigations reveal a positive antinuclear antibody (ANA) test and positive anti-
double-stranded DNA (anti-dsDNA) antibodies.
What is the most accurate diagnosis?
A. Rheumatoid arthritis
B. Systemic lupus erythematosus (SLE)
C. Systemic sclerosis
D. Dermatomyositis
Correct Answer: B. Systemic lupus erythematosus (SLE)
Rationale:
Exam with Questions, Answers and Rationales
2026/2027 Update
Question 1: Cardiology / Emergency Medicine
A 68-year-old man presents to the emergency department with acute, crushing substernal chest
pain radiating to his left arm. An electrocardiogram (ECG) demonstrates significant ST-segment
elevations in leads II, III, and aVF.
Which coronary artery is most likely occluded?
A. Left anterior descending artery
B. Left circumflex artery
C. Diagonal branch artery
D. Right coronary artery
Correct Answer: D. Right coronary artery
Rationale:
Inferior wall myocardial infarctions classically present with ST-segment elevations in leads II,
III, and aVF. In the majority of individuals, the right coronary artery (RCA) supplies the inferior
wall of the left ventricle as well as the sinoatrial and atrioventricular nodes. Left anterior
descending (LAD) occlusions present with anterior changes (V1–V4), and left circumflex (LCx)
lesions typically affect the lateral leads (I, aVL, V5–V6).
Question 2: Pulmonology / Critical Care
A 65-year-old man with a long-standing history of chronic obstructive pulmonary disease
(COPD) presents with worsening dyspnea and increased sputum purulence. An arterial blood gas
(ABG) analysis shows pH 7.32, PaCO₂ 60 mmHg, and PaO₂ 55 mmHg on room air.
What is the best immediate next step in management?
A. High-dose IV steroids only
B. Noninvasive positive pressure ventilation (BiPAP)
, C. Immediate endotracheal intubation
D. Intravenous loop diuretics
Correct Answer: B. Noninvasive positive pressure ventilation (BiPAP)
Rationale:
This patient is experiencing acute hypercapnic respiratory failure secondary to a COPD
exacerbation. For patients with acute-on-chronic hypercapnic respiratory failure (pH < 7.35 and
PaCO₂ > 45 mmHg), a trial of noninvasive positive pressure ventilation (BiPAP) is the first-line
intervention. It reduces the work of breathing, improves alveolar ventilation, corrects pH, and
decreases the need for invasive mechanical ventilation unless absolute contraindications or
failure occur.
Question 3: Endocrinology
A 22-year-old woman presents to her primary care physician complaining of progressive heat
intolerance, unintentional weight loss, palpitations, and fine tremors of her hands. Laboratory
evaluation reveals a suppressed thyroid-stimulating hormone (TSH) level and significantly
elevated free thyroxine (T4).
What is the most likely underlying diagnosis?
A. Hashimoto thyroiditis
B. Graves disease
C. Subacute granulomatous thyroiditis
D. Secondary hypothyroidism
Correct Answer: B. Graves disease
Rationale:
The clinical presentation of hyperthyroidism (heat intolerance, weight loss, tremor, palpitations)
combined with low TSH and high free T4 points toward primary hyperthyroidism. In a young
woman, Graves disease is the most frequent cause, driven by thyroid-stimulating
immunoglobulins (TSI) that bind to and activate TSH receptors. Hashimoto thyroiditis typically
results in primary hypothyroidism (high TSH, low T4).
Question 4: Gastroenterology / Pediatrics
,A newborn term infant fails to pass meconium within the first 48 hours of life. Abdominal
radiographs show dilated loops of bowel, and a contrast enema reveals a distinct transition zone
between a narrowed distal rectosigmoid colon and a dilated proximal colon.
Which of the following is the most likely diagnosis?
A. Necrotizing enterocolitis
B. Hirschsprung disease
C. Hypertrophic pyloric stenosis
D. Meconium ileus
Correct Answer: B. Hirschsprung disease
Rationale:
Failure to pass meconium within 48 hours accompanied by a transition zone on contrast enema
strongly indicates Hirschsprung disease (congenital aganglionosis). The absence of ganglion
cells in the Meissner and Auerbach plexuses results in a tonic contraction of the affected bowel
segment, functional obstruction, and proximal dilation.
Question 5: Nephrology / Physiology
A patient with severe acute pancreatitis develops sudden, painful carpopedal spasms and perioral
numbness. Laboratory testing demonstrates a decreased total serum calcium level.
What is the primary pathological mechanism driving hypocalcemia in this setting?
A. Increased renal calcium excretion
B. Suppression of parathyroid hormone synthesis
C. Fat saponification within necrotic peripancreatic tissue
D. Accelerated bone mineralization
Correct Answer: C. Fat saponification within necrotic tissue
Rationale:
Acute pancreatitis leads to the enzymatic leakage and activation of pancreatic lipase, causing fat
necrosis of the peripancreatic and retroperitoneal adipose tissue. Free fatty acids released during
lipolysis bind to calcium ions, forming insoluble calcium soaps (saponification). This process
sequesters systemic calcium, frequently resulting in marked hypocalcemia.
, Question 6: Urology
A 45-year-old man presents with acute-onset high fever, chills, low back pain, dysuria, and
perineal discomfort. Digital rectal examination reveals a markedly tender, warm, and boggy
prostate gland. Urinalysis shows pyuria and bacteriuria.
What is the most likely diagnosis?
A. Benign prostatic hyperplasia (BPH)
B. Acute bacterial prostatitis
C. Acute epididymitis
D. Interstitial cystitis
Correct Answer: B. Acute bacterial prostatitis
Rationale:
The classic triad of systemic infection signs (fever, chills), irritative voiding symptoms (dysuria),
and localized perineal/pelvic pain with a warm, exquisitely tender prostate on physical exam
defines acute bacterial prostatitis. Gram-negative rods (most commonly Escherichia coli) are the
typical causative agents. Massage of an acutely inflamed prostate should be strictly avoided due
to the risk of inducing bacteremia.
Question 7: Rheumatology / Immunology
A 30-year-old woman visits her physician due to generalized fatigue, joint stiffness in her hands,
and a malar rash across her cheeks and bridge of the nose that worsens after sun exposure.
Laboratory investigations reveal a positive antinuclear antibody (ANA) test and positive anti-
double-stranded DNA (anti-dsDNA) antibodies.
What is the most accurate diagnosis?
A. Rheumatoid arthritis
B. Systemic lupus erythematosus (SLE)
C. Systemic sclerosis
D. Dermatomyositis
Correct Answer: B. Systemic lupus erythematosus (SLE)
Rationale:
