In sinus block,
A)The pause is a multiple of the R-R intervals.
B)There are P waves inside the pause.
C)All R-R intervals are constant.
D)The heart rate varies from 100 to 160.

Question

Quizplus · Accepted Answer

In sinus block, there is a pause in the cardiac cycle due to the failure of the sinus node to initiate an impulse. This pause is usually a multiple of the R-R intervals, which means that the duration of the pause is a whole number multiple of the length of each R-R interval. Therefore, choice A is the best option. Choices B, C, and D are not characteristic of sinus block, as there are no P waves during the pause, the R-R intervals may not be constant, and the heart rate may not necessarily vary between 100 to 160 bpm.

In Sinus Block