What does a widened QRS complex suggest on an ECG?

A widened QRS complex on an ECG indicates a delay in ventricular conduction. The QRS complex represents the electrical activity associated with the depolarization of the ventricles. When this interval is widened, it suggests that there is a disruption or slowing of the conduction pathway through the ventricles. This can occur due to various conditions, such as bundle branch blocks or other forms of intraventricular conduction delays.

In contrast, the other options do not directly relate to a widened QRS complex. Atrial enlargement is typically indicated by alterations in the P wave, while ventricular hypertrophy generally presents with an increase in amplitude of the QRS complex rather than a widening. Myocardial ischemia may affect the ST segment or T wave but does not specifically cause widening of the QRS complex. Thus, the indication of a widened QRS is largely tied to issues with ventricular conduction.