Sinus exit block and sinus arrest result in similar ECG tracings. The distinguishing factor is that in sinus exit block, the:
A)QRS is slightly wider than normal.
B)P waves are inverted or entirely absent.
C)pause duration is usually greater than 6 seconds.
D)pause duration is a multiple of the R-R or P-P interval.

Question

Quizplus · Accepted Answer

In sinus exit block, the pause duration is a multiple of the R-R or P-P interval, while in sinus arrest the pause duration is usually greater than 6 seconds. The width of the QRS and the appearance of the P waves are not distinguishing factors in differentiating between the two.

Sinus Exit Block and Sinus Arrest Result in Similar ECG