When the sinus node fails to discharge, the absence of a PQRST interval is noted on the rhythm and is called:
A) sinus arrest.
B) sinus bradycardia.
C) sinus rhythm.
D) sinus dysrhythmia.

Question

Quizplus · Accepted Answer

Sinus arrest is the absence of a PQRST interval on the rhythm when the sinus node fails to discharge. Sinus bradycardia is when the heart beats slower than normal due to a slower-than-normal discharge rate from the SA node. Sinus rhythm is the normal rhythm of the heart where the electrical impulses originate in the SA node. Sinus dysrhythmia is a variation in the normal sinus rhythm and can have irregularities in the PQRST interval.

When the Sinus Node Fails to Discharge, the Absence of a PQRST