Certified Cardiographic Technician (CCT) Practice Exam 2026 - Free CCT Practice Questions and Study Guide

The T wave in an ECG represents ventricular repolarization. During this phase of the cardiac cycle, the ventricles are transitioning from a state of contraction back to resting potential after having expelled blood. This process is crucial for the heart’s rhythm as it prepares the ventricles for the next cycle of depolarization and contraction.

Understanding the significance of the T wave helps in interpreting ECG results and assessing cardiac health. It reflects how well the heart is recovering after each beat and any abnormalities, such as changes in shape or duration of the T wave, can indicate underlying heart conditions.

The other concepts mentioned in the choices relate to different phases of the cardiac cycle. For example, ventricular contraction corresponds to the QRS complex, while atrial repolarization is represented by a wave that is typically not visually distinct or can be obscured by the QRS complex. Ventricular depolarization is also represented by the QRS complex, which illustrates the electrical activity that leads to the contraction of the ventricles. Thus, the T wave's role in representing ventricular repolarization is essential for understanding heart function and the comprehensive analysis of ECG patterns.