Which of the following heart block dysrhythmias is identified by missing QRS complexes and a consistent PR interval measurement?
A)First-degree heart block
B)Second-degree AV block, Mobitz type I
C)Second-degree AV block, Mobitz type II
D)Third-degree AV block

Question

Quizplus · Accepted Answer

Second-degree AV block, Mobitz type II, is characterized by dropped (missing) QRS complexes with a consistent PR interval for the conducted beats. This distinguishes it from Mobitz type I, where the PR interval progressively lengthens until a beat is dropped, and from first-degree heart block, where there is a prolonged but consistent PR interval without dropped beats. Third-degree AV block involves a complete dissociation between atrial and ventricular activity, not just missing QRS complexes with a consistent PR interval.

Which of the Following Heart Block Dysrhythmias Is Identified by Missing