As a medical professional with expertise in cardiology, I can explain that the portion of the ECG that indicates ventricular repolarization is the T wave. The ECG, or electrocardiogram, is a graphical representation of the electrical activity of the heart, which is essential for diagnosing various heart conditions. Here's a breakdown of the ECG waves and their meanings: 1. P wave: Represents atrial depolarization, which is the spread of electrical impulses through the atria, causing them to contract and push blood into the ventricles. 2. QRS complex: Indicates ventricular depolarization, which is the rapid depolarization of the ventricles, leading to their contraction and the subsequent pumping of blood to the lungs and the rest of the body. 3. T wave: This is the wave that follows the QRS complex and represents the repolarization of the ventricles, which is the return of the ventricles to their resting state after depolarization. It's important to note that the T wave's shape and amplitude can provide valuable information about the heart's condition, and any abnormalities in the T wave can be indicative of certain cardiac issues. read more >>

Atrial and ventricular depolarization and repolarization are represented on the ECG as a series of waves: the P wave followed by the QRS complex and the T wave. The first deflection is the P wave associated with right and left atrial depolarization.read more >>