**Question:** Prolongation of QRS complex in ECG represents:

A. QRS duration >120ms (normal 120ms (normal 120ms (normal 120ms, which is a more specific indicator of ventricular hypertrophy and impaired conduction, as opposed to ST segment abnormalities or other ECG findings. Prolonged QRS complex should be considered in the context of a patient's clinical presentation and other ECG findings to accurately diagnose cardiac pathology.