Which two types of heart block have a constant PR interval?
A)First-degree and second-degree type Mobitz I
B)First degree and second degree Mobitz type II
C)Second-degree Mobitz type I and third degree
D)Second-degree Mobitz type II and third degree

Question

Quizplus · Accepted Answer

First-degree heart block and second-degree Mobitz type II heart block both have a constant PR interval. In first-degree heart block, every impulse is conducted to the ventricles but with a prolonged PR interval. In second-degree Mobitz type II heart block, some impulses are not conducted, but the PR interval of the conducted beats remains constant.

Which Two Types of Heart Block Have a Constant PR