The heart block rhythm that most closely resembles a normal sinus rhythm is a:
A) third-degree block.
B) first-degree block.
C) second-degree block, type I.
D) second-degree block, type II.

Question

Quizplus · Accepted Answer

A first-degree block is a mild form of heart block where there is a delay in the transmission of electrical impulses from the atria to the ventricles. The delay is typically seen in the PR interval, which is longer than 0.20 seconds, but all impulses are eventually conducted to the ventricles. This rhythm still resembles a normal sinus rhythm, but with a longer PR interval, making it the best choice for the given question.

The Heart Block Rhythm That Most Closely Resembles a Normal