If the SA node is not functioning, an ECG will show__________ .
A) no P waves with a HR between 40-60 bpm
B) no QRS waves
C) higher P waves
D) more P waves than QRS waves

Question

Quizplus · Accepted Answer

The SA node (sinoatrial node) is responsible for initiating the heart's electrical impulse, leading to the generation of P waves on an ECG, which represent atrial depolarization. If the SA node is not functioning, the heart's backup pacemaker, the AV node (atrioventricular node), typically takes over at a slower rate, resulting in a heart rate between 40-60 bpm and the absence of P waves, as the impulse does not originate in the SA node.

If the SA Node Is Not Functioning, an ECG Will