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 and decelerate during the respiratory cycle. What is the diagnosis?
This is sinus arrhythmia. Wenckebach & third-degree AVB would have a nonconducted 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.