What is the normal QRS duration in seconds?

The normal QRS duration, which reflects the time taken for ventricular depolarization, typically ranges from 0.04 to 0.12 seconds. This duration indicates the efficiency and speed with which electrical impulses travel through the ventricles. A QRS interval within this range suggests that the conduction system is functioning properly without any significant delays, such as those seen in conditions like bundle branch blocks or other intraventricular conduction delays.

A duration shorter than 0.04 seconds is generally considered abnormal, indicating possible conduction abnormalities, while a duration longer than 0.12 seconds can signify a delay in electrical conduction through the ventricles. Thus, recognizing the normal QRS duration is essential for interpreting electrocardiograms and for diagnosing cardiac conditions effectively.