An ECG tracing from a patient with a pacemaker may have wide or bizarre __________ if the pacemaker captures the chamber it is pacing.
A) P waves
B) T waves
C) QRS complexes
D) R-R intervals

Question

Quizplus · Accepted Answer

Pacemakers primarily affect the QRS complex because they directly stimulate the ventricles, leading to a wider and more bizarre appearance compared to a natural QRS complex. This is due to the artificial and non-physiological pathway of electrical conduction caused by the pacemaker's stimulation.

An ECG Tracing from a Patient with a Pacemaker May