Certified Rhythm Analysis Technician (CRAT) Practice Exam 2026 – All-in-One Study Guide for Exam Success!

The T wave in a normal electrocardiogram (ECG) represents the repolarization of the ventricles. This phase follows the depolarization that occurs during the QRS complex, where the ventricles contract. During repolarization, the ventricular muscle cells restore their resting electrical charge after contraction, which is crucial for the heart to prepare for the next heartbeat.

This process is essential for maintaining the proper rhythm and function of the heart. The timing and shape of the T wave can provide important clinical insights, such as identifying potential issues like ischemia or electrolyte imbalances. Other options, such as the depolarization of the atria or ventricles, pertain to different phases of the cardiac cycle, specifically represented by the P wave and the QRS complex, respectively. Thus, understanding that the T wave specifically correlates with the ventricular repolarization is key to accurate ECG interpretation.