An EKG demonstrates a PR interval of 0.16 seconds, a P to QRS relationship of 1:1, a variable heart rate and an R to R interval that is noted to accelerate ad decelerate during the respiratory cycle. What is the diagnosis?
A Wenckebach
B third degree heart block
C atrial fibrillation
D sinus arrhythmia
E atrial flutter
Answer: D
This is sinus arrhythmia. Wenckebach & third degree AVB would have a non-conducted P wave. A fib would have no P waves and an irregularly irregular rhythm. A flutter would have "flutter waves" or a regular rhythm of 150.
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