UKMLA PLAB AMC USMLE Prometric MCQ

Correct Answer: C

Explanation:
Sinus bradycardia is a regular rhythm , but the heart rate is less than 60. Athletes can have sinus bradycardia. A normal sinus rhythm would have a rate of 60-100 beats per minute. With sinus tachycardia the heart rate would be greater than 100. Sinus arrhythmia would show an irregular rhythm associated with respiration. In a junctional rhythm normal P waves would not be present and the heart rate would be 40-60 beats per minute.