USMLE step 2 Mcq 333:An 18 year old female premedical student is concerned because she notices that her heart rate is not regular

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Question:
An 18 year old female premedical student is concerned because she notices that her heart rate is not regular. Her blood pressure is 102/65 and her heart rate is 72 beats per minute and is mildly irregular. An ECG is done and shows upright P waves, a PR interval of .12 seconds, a QRS complex of .08 seconds with a normal configuration. Her ECG shows that there is a slight variation in her heart rhythm during respiration. What is the most appropriate description of the ECG findings?

a) normal sinus rhythm
b) sinus tachycardia
c) complete heart block
d) atrial fibrillation
e) sinus arrhythmia


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