UKMLA PLAB AMC USMLE Prometric MCQ

Correct Answer: E

Explanation:
Sinus arrhythmia is a variation in the heart rate that occurs with respiration. The rhythm is irregular in that the heart rate increases with inspiration and decreases with expiration. A normal sinus rhythm would have a rate of 60-100 beats per minute. The rhythm would be regular. With sinus tachycardia , the heart rate would be greater than 100. The rhythm would be regular. With sinus bradycardia the heart rate would be less than 60. The rhythm would be regular. In a junctional rhythm normal P waves would not be present and the heart rate would be 40-60 beats per minute. The rhythm would be regular