Certified Polysomnographic Technician (CPSGT) Practice Exam 2025 – Comprehensive All-in-One Study Guide for Exam Success!

The T wave in an electrocardiogram (ECG) represents ventricular repolarization, which is a crucial part of the cardiac cycle. After the ventricles contract and depolarize during the QRS complex to pump blood out of the heart, the T wave signals the recovery phase. This is when the ventricular muscle cells restore their resting state, allowing the heart to be ready for the next cycle of contraction.

Understanding the significance of the T wave is essential for interpreting ECGs, as it provides insights into the heart's electrical activity. Abnormalities in the T wave can indicate various cardiac conditions, such as ischemia, electrolyte imbalances, or issues with the heart's rhythm. This critical process ensures that the heart's electrical system functions effectively, maintaining an organized and efficient heartbeat.