COMSAE Phase 1 – Form ASA 110i
(Features Embedded Video Media) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed
Rationales
Question 1
A 65-year-old man presents with crushing substernal chest
pain radiating to his left arm. ECG shows ST-segment
elevations in leads II, III, and aVF. Which coronary artery is
most likely occluded?
A. Left anterior descending artery
B. Circumflex artery
C. Right coronary artery
D. Left main coronary artery
E. Posterior descending artery
Rationale: Inferior wall myocardial infarctions typically
produce ST elevations in leads II, III, and aVF. The right
coronary artery supplies the inferior wall in most individuals.
LAD occlusion causes anterior wall infarction, while circumflex
artery occlusion generally affects the lateral wall.
Question 2
,A patient develops severe watery diarrhea after taking broad-
spectrum antibiotics. Which organism is most likely
responsible?
A. Salmonella enterica
B. Campylobacter jejuni
C. Vibrio cholerae
D. Clostridioides difficile
E. Shigella sonnei
Rationale: Antibiotic-associated diarrhea and
pseudomembranous colitis are classically caused by
Clostridioides difficile. Toxins A and B disrupt the colonic
mucosa, leading to inflammation and diarrhea.
Question 3
A newborn exhibits a continuous machinery-like murmur.
Which congenital heart defect is most likely present?
A. Ventricular septal defect
B. Tetralogy of Fallot
C. Atrial septal defect
D. Coarctation of the aorta
E. Patent ductus arteriosus
Rationale: A patent ductus arteriosus causes a characteristic
continuous machinery murmur due to persistent
communication between the pulmonary artery and aorta
after birth.
,Question 4
Which vitamin deficiency is most commonly associated with
megaloblastic anemia and neurologic symptoms?
A. Vitamin B1
B. Vitamin B6
C. Folate
D. Vitamin C
E. Vitamin B12
Rationale: Vitamin B12 deficiency causes megaloblastic
anemia and neurologic manifestations due to impaired myelin
synthesis. Folate deficiency causes megaloblastic anemia
without neurologic symptoms.
Question 5
A patient with hyperthyroidism most likely demonstrates
which physiologic change?
A. Bradycardia
B. Weight gain
C. Decreased basal metabolic rate
D. Increased cardiac output
E. Cold intolerance
Rationale: Excess thyroid hormone increases metabolic
activity, heart rate, contractility, and cardiac output. Patients
typically experience heat intolerance and weight loss.
Question 6
, A woman experiences recurrent episodes of flushing,
diarrhea, and wheezing. Which substance is most likely
elevated?
A. Histamine
B. Dopamine
C. Serotonin
D. Acetylcholine
E. Norepinephrine
Rationale: Carcinoid syndrome results from secretion of
serotonin by neuroendocrine tumors. Elevated serotonin
causes flushing, diarrhea, bronchospasm, and right-sided
valvular disease.
Question 7
Which cranial nerve innervates the lateral rectus muscle?
A. CN III
B. CN IV
C. CN V
D. CN VI
E. CN VII
Rationale: The abducens nerve (CN VI) controls the lateral
rectus muscle, which abducts the eye. Injury causes medial
deviation and diplopia.
Question 8
(Features Embedded Video Media) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed
Rationales
Question 1
A 65-year-old man presents with crushing substernal chest
pain radiating to his left arm. ECG shows ST-segment
elevations in leads II, III, and aVF. Which coronary artery is
most likely occluded?
A. Left anterior descending artery
B. Circumflex artery
C. Right coronary artery
D. Left main coronary artery
E. Posterior descending artery
Rationale: Inferior wall myocardial infarctions typically
produce ST elevations in leads II, III, and aVF. The right
coronary artery supplies the inferior wall in most individuals.
LAD occlusion causes anterior wall infarction, while circumflex
artery occlusion generally affects the lateral wall.
Question 2
,A patient develops severe watery diarrhea after taking broad-
spectrum antibiotics. Which organism is most likely
responsible?
A. Salmonella enterica
B. Campylobacter jejuni
C. Vibrio cholerae
D. Clostridioides difficile
E. Shigella sonnei
Rationale: Antibiotic-associated diarrhea and
pseudomembranous colitis are classically caused by
Clostridioides difficile. Toxins A and B disrupt the colonic
mucosa, leading to inflammation and diarrhea.
Question 3
A newborn exhibits a continuous machinery-like murmur.
Which congenital heart defect is most likely present?
A. Ventricular septal defect
B. Tetralogy of Fallot
C. Atrial septal defect
D. Coarctation of the aorta
E. Patent ductus arteriosus
Rationale: A patent ductus arteriosus causes a characteristic
continuous machinery murmur due to persistent
communication between the pulmonary artery and aorta
after birth.
,Question 4
Which vitamin deficiency is most commonly associated with
megaloblastic anemia and neurologic symptoms?
A. Vitamin B1
B. Vitamin B6
C. Folate
D. Vitamin C
E. Vitamin B12
Rationale: Vitamin B12 deficiency causes megaloblastic
anemia and neurologic manifestations due to impaired myelin
synthesis. Folate deficiency causes megaloblastic anemia
without neurologic symptoms.
Question 5
A patient with hyperthyroidism most likely demonstrates
which physiologic change?
A. Bradycardia
B. Weight gain
C. Decreased basal metabolic rate
D. Increased cardiac output
E. Cold intolerance
Rationale: Excess thyroid hormone increases metabolic
activity, heart rate, contractility, and cardiac output. Patients
typically experience heat intolerance and weight loss.
Question 6
, A woman experiences recurrent episodes of flushing,
diarrhea, and wheezing. Which substance is most likely
elevated?
A. Histamine
B. Dopamine
C. Serotonin
D. Acetylcholine
E. Norepinephrine
Rationale: Carcinoid syndrome results from secretion of
serotonin by neuroendocrine tumors. Elevated serotonin
causes flushing, diarrhea, bronchospasm, and right-sided
valvular disease.
Question 7
Which cranial nerve innervates the lateral rectus muscle?
A. CN III
B. CN IV
C. CN V
D. CN VI
E. CN VII
Rationale: The abducens nerve (CN VI) controls the lateral
rectus muscle, which abducts the eye. Injury causes medial
deviation and diplopia.
Question 8
