Which of the following is characteristic of an ECG tracing for a second-degree AV block, Mobitz type II?
A)The P waves are all the same.
B)A QRS complex follows each P wave.
C)The pacemaker site is in the AV junction.
D)The ventricular rate is less than 40 bpm.

Question

Quizplus · Accepted Answer

In a second-degree AV block, Mobitz type II, the P waves are consistent in appearance, indicating that the atria are being depolarized normally by the sinus node. This type of block is characterized by a sudden failure of some P waves to conduct to the ventricles without a progressive lengthening of the PR interval, which differentiates it from Mobitz type I (Wenckebach). Choices B, C, and D describe other conditions or types of heart blocks.

Which of the Following Is Characteristic of an ECG Tracing