What does it indicate if the QRS complex duration exceeds 0.10 seconds?

When the QRS complex duration exceeds 0.10 seconds, it typically indicates a possible conduction delay within the ventricles. The QRS complex represents the depolarization of the ventricles, and its duration reflects how efficiently the electrical impulse travels through the ventricular myocardium. A prolonged QRS may suggest issues such as bundle branch blocks or other intraventricular conduction delays, where the electrical signal is hindered as it moves through the ventricles.

In normal physiology, a QRS duration of less than 0.10 seconds is expected, as this indicates quick and efficient conduction. Thus, an extended duration suggests a disruption in this process, which is critical to maintaining proper heart function and rhythm. Therefore, recognizing a prolonged QRS complex as a potential sign of delayed conduction is essential for diagnosing and managing various cardiac conditions.