Medical MCQs
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Patients who are diagnosed with Wolff-Parkinson-White (WPW) syndrome have an ECG with a short PR interval, delta wave, and a history of which of the following?
- A. Paroxysmal supraventricular tachycardia (PSVT)
- B. Orthodromic circus movement tachycardia (CMT)
- C. Antidromic circus movement tachycardia (CMT)
- D. Any of the above
- Correct Answer: Option D
A supraventricular arrhythmia is any arrhythmia that arises above what level?
- A. Purkinje fibers
- B. Either left or right bundle branch
- C. Atrioventricular bundle (of His)
- D. Atrioventricular (AV) node
- Correct Answer: Option C
Which of the following describes non-sustained tachyarrhythmia?
- A. Arrhythmia with rate >60 for 3 beats or more for less than 1 minute
- B. Arrhythmia with rate >150 for 3 beats or more for less than 30 seconds
- C. Arrhythmia with rate >150 for 6 beats or more for less than 1 minute
- D. Arrhythmia with rate >100 for 3 beats or more for less than 30 seconds
- Correct Answer: Option D
An event monitor would be indicated instead of a Holter monitor for which of the following cases?
- A. Elderly patient with suspected atrial fibrillation found during pulse palpation
- B. To determine ST segment changes after an acute myocardial infarction (MI)
- C. Medical student with intermittent caffeine-induced supraventricular tachycardia
- D. To identify and quantify an asymptomatic bradyarrhythmia or tachyarrhythmia
- Correct Answer: Option C
For patients presenting with palpitations, dizziness, or syncope, what is the recommended diagnostic test after a history and physical exam have been performed?
- A. External or implanted event monitor
- B. Tilt table test
- C. ENT, neurologic, or psychiatric consult
- D. Exercise stress test
- Correct Answer: Option A
Which of the following would NOT be a useful diagnostic tool for a patient presenting with syncope?
- A. Signal averaged ECG (SAECG)
- B. External or implanted event monitor
- C. Electrophysiology study
- D. Cryoablation or laser catheter ablation
- Correct Answer: Option D
Which of the following would NOT be a useful diagnostic tool for a patient presenting with dizziness?
- A. History and physical exam
- B. Implanted event monitor (loop recorder)
- C. ENT or neurologic consult
- D. Tilt table test
- Correct Answer: Option B
Which of the following would NOT be a useful diagnostic tool for a patient presenting with palpitations?
- A. External event monitor (Holter)
- B. Electrophysiology study
- C. Exercise stress test
- D. Tilt table test
- Correct Answer: Option D
A patient with a known unidirectional ventricular accessory pathway is implanted with an implantable cardioverter defibrillator (ICD). During a ventricular tachycardia episode, the device will determine the ventricular rate and then pace several times at a higher rate in order to painlessly terminate the episode. What type of cardiac arrhythmia mechanism is this device treating?
- A. Later after-depolarization
- B. Circus movement re-entry
- C. Reflection re-entry
- D. Phase 2 re-entry
- Correct Answer: Option D
During which phase of the cardiac action potential do late after-depolarizations arise?
- A. Phase 0
- B. Phase 1
- C. Phase 2
- D. Phase 3
- Correct Answer: Option C