The ventricles are completely depolarized during which isoelectric portion of the electrocardiogram (ECG)?

Question

Quizplus · Accepted Answer

[III A]. The PR segment (part of the PR interval) and the ST segment are the only portions of the electrocardiogram (ECG) that are isoelectric. The PR interval includes the P wave (atrial depolarization) and the PR segment, which represents conduction through the atrioventricular (AV) node; during this phase, the ventricles are not yet depolarized. The ST segment is the only isoelectric period when the entire ventricle is depolarized.

The Ventricles Are Completely Depolarized During Which Isoelectric Portion of the Electrocardiogram