37. Choice B is the correct answer. Sinus arrhythmia the pacemaker still originates from the SA node but the pacemaking activity is irregular varying with inspiration and expiration. Sinus block is when an unhealthy SA node quits pacing activity for at least one complete cycle. Premature atrial contraction is when the P wave occurs earlier than expected. First degree AV block is when there is a prolonged PR interval and no dropped QRS complexes.
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