SMQT EXAM 300 QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES
|COMPREHENSIVE MEDICAL EXAM QUESTIONS
Part 1: Cardiology (Questions 1-50)
1. A 65-year-old male with a history of hypertension and diabetes presents with
crushing substernal chest pain radiating to his left arm. An ECG shows ST-segment
elevation in leads V1-V4. Which coronary artery is most likely occluded?
A. Left circumflex artery
B. Right coronary artery
C. Left anterior descending artery
D. Left main coronary artery
Correct Answer: C
Rationale: ST-segment elevation in precordial leads V1-V4 indicates an anterior
wall myocardial infarction. The anterior wall of the left ventricle is primarily
supplied by the left anterior descending (LAD) artery. Occlusion of the LAD is
commonly referred to as a "widow-maker" lesion.
2. Which of the following physical exam findings is most characteristic of severe
aortic stenosis?
A. A high-pitched, blowing diastolic murmur at the apex
B. A crescendo-decrescendo systolic murmur radiating to the carotids
C. A holosystolic murmur at the apex radiating to the axilla
,D. A mid-diastolic rumble with an opening snap
Correct Answer: B
Rationale: Aortic stenosis produces a crescendo-decrescendo (ejection systolic)
murmur that is best heard at the right upper sternal border and classically
radiates to the carotid arteries. Option A describes aortic regurgitation, C
describes mitral regurgitation, and D describes mitral stenosis.
3. A 28-year-old female presents with palpitations. An ECG reveals a narrow-
complex tachycardia with a heart rate of 180 bpm. The rhythm is regular, and P
waves are not visible. What is the most likely diagnosis?
A. Atrial fibrillation
B. Ventricular tachycardia
C. Paroxysmal supraventricular tachycardia (PSVT)
D. Sinus tachycardia
Correct Answer: C
Rationale: A regular, narrow-complex tachycardia with a rate of 150-250 bpm and
absent P waves is characteristic of Paroxysmal Supraventricular Tachycardia
(PSVT), most commonly due to AV nodal reentrant tachycardia (AVNRT). Atrial
fibrillation is irregularly irregular. Ventricular tachycardia is typically wide-
complex. Sinus tachycardia rarely exceeds 150 bpm at rest and has visible P
waves.
4. A patient with a history of heart failure has an ejection fraction of 30%. Which
of the following medications has been shown to reduce mortality in this
condition?
A. Amlodipine
, B. Diltiazem
C. Metoprolol succinate
D. Verapamil
Correct Answer: C
Rationale: Metoprolol succinate is a beta-blocker with proven mortality benefit in
heart failure with reduced ejection fraction (HFrEF). Amlodipine is a
dihydropyridine calcium channel blocker with neutral effects on mortality.
Diltiazem and verapamil are non-dihydropyridine calcium channel blockers that
are contraindicated in HFrEF as they can worsen systolic function.
5. What is the most common cause of infective endocarditis in patients who inject
drugs?
A. *Staphylococcus aureus*
B. *Streptococcus viridans*
C. *Enterococcus faecalis*
D. *Staphylococcus epidermidis*
Correct Answer: A
Rationale: *Staphylococcus aureus* is the most common cause of infective
endocarditis in people who inject drugs (PWID). It typically affects the right-sided
valves, especially the tricuspid valve. *Streptococcus viridans* is more common in
native valve endocarditis in non-PWID. *Staphylococcus epidermidis* is a
common cause of prosthetic valve endocarditis.
6. A 70-year-old male presents with syncope. He has a history of aortic stenosis.
Which of the following is a classic symptom triad of severe aortic stenosis?
ANSWERS WITH DETAILED RATIONALES
|COMPREHENSIVE MEDICAL EXAM QUESTIONS
Part 1: Cardiology (Questions 1-50)
1. A 65-year-old male with a history of hypertension and diabetes presents with
crushing substernal chest pain radiating to his left arm. An ECG shows ST-segment
elevation in leads V1-V4. Which coronary artery is most likely occluded?
A. Left circumflex artery
B. Right coronary artery
C. Left anterior descending artery
D. Left main coronary artery
Correct Answer: C
Rationale: ST-segment elevation in precordial leads V1-V4 indicates an anterior
wall myocardial infarction. The anterior wall of the left ventricle is primarily
supplied by the left anterior descending (LAD) artery. Occlusion of the LAD is
commonly referred to as a "widow-maker" lesion.
2. Which of the following physical exam findings is most characteristic of severe
aortic stenosis?
A. A high-pitched, blowing diastolic murmur at the apex
B. A crescendo-decrescendo systolic murmur radiating to the carotids
C. A holosystolic murmur at the apex radiating to the axilla
,D. A mid-diastolic rumble with an opening snap
Correct Answer: B
Rationale: Aortic stenosis produces a crescendo-decrescendo (ejection systolic)
murmur that is best heard at the right upper sternal border and classically
radiates to the carotid arteries. Option A describes aortic regurgitation, C
describes mitral regurgitation, and D describes mitral stenosis.
3. A 28-year-old female presents with palpitations. An ECG reveals a narrow-
complex tachycardia with a heart rate of 180 bpm. The rhythm is regular, and P
waves are not visible. What is the most likely diagnosis?
A. Atrial fibrillation
B. Ventricular tachycardia
C. Paroxysmal supraventricular tachycardia (PSVT)
D. Sinus tachycardia
Correct Answer: C
Rationale: A regular, narrow-complex tachycardia with a rate of 150-250 bpm and
absent P waves is characteristic of Paroxysmal Supraventricular Tachycardia
(PSVT), most commonly due to AV nodal reentrant tachycardia (AVNRT). Atrial
fibrillation is irregularly irregular. Ventricular tachycardia is typically wide-
complex. Sinus tachycardia rarely exceeds 150 bpm at rest and has visible P
waves.
4. A patient with a history of heart failure has an ejection fraction of 30%. Which
of the following medications has been shown to reduce mortality in this
condition?
A. Amlodipine
, B. Diltiazem
C. Metoprolol succinate
D. Verapamil
Correct Answer: C
Rationale: Metoprolol succinate is a beta-blocker with proven mortality benefit in
heart failure with reduced ejection fraction (HFrEF). Amlodipine is a
dihydropyridine calcium channel blocker with neutral effects on mortality.
Diltiazem and verapamil are non-dihydropyridine calcium channel blockers that
are contraindicated in HFrEF as they can worsen systolic function.
5. What is the most common cause of infective endocarditis in patients who inject
drugs?
A. *Staphylococcus aureus*
B. *Streptococcus viridans*
C. *Enterococcus faecalis*
D. *Staphylococcus epidermidis*
Correct Answer: A
Rationale: *Staphylococcus aureus* is the most common cause of infective
endocarditis in people who inject drugs (PWID). It typically affects the right-sided
valves, especially the tricuspid valve. *Streptococcus viridans* is more common in
native valve endocarditis in non-PWID. *Staphylococcus epidermidis* is a
common cause of prosthetic valve endocarditis.
6. A 70-year-old male presents with syncope. He has a history of aortic stenosis.
Which of the following is a classic symptom triad of severe aortic stenosis?
