Certified EKG Technician (CET) Practice Exam 2026 – Comprehensive Test Prep

The normal duration of a QRS complex is between 0.06 to 0.10 seconds, which reflects the time it takes for the ventricles to depolarize. This measurement is crucial in assessing cardiac health, as a QRS duration that falls within this range indicates that the electrical impulses are being conducted effectively through the ventricles.

A duration shorter than 0.06 seconds may indicate a rapid conduction pathway, while a duration longer than 0.10 seconds may suggest a delay in conduction, which can be due to various cardiac conditions like bundle branch block or other intraventricular conduction delays.

Understanding the normal duration of the QRS complex is essential for ECG interpretation, allowing technicians to identify potential abnormalities in cardiac function.