While monitoring a patient's cardiac rhythm, you note that there is no electrical activity after a PQRST complex for a period equal to exactly three of the previous R-R intervals. This is most accurately described as:
A) sinus arrest.
B) sinus pause.
C) sinus arrhythmia.
D) sinus block.

Question

Quizplus · Accepted Answer

This scenario describes a sinus block, which occurs when there is a sudden interruption of electrical activity in the SA node, resulting in a pause in the cardiac cycle. A sinus arrest would involve a longer pause with no PQRST complex, a sinus pause would involve a smaller pause, and sinus arrhythmia would involve irregularity in the timing of the PQRST complexes.

While Monitoring a Patient's Cardiac Rhythm, You Note That There