In an Electrocardiogram, the highest peak is produced during the R phase of the QRS complex, which represents the depolarization of the ventricles, followed by their contraction.
The highest peak in the Electrocardiogram (ECG) is produced during the R phase of the QRS complex. This peak reflects the depolarization of the ventricles, which is a larger electrical event due to the substantial size of the ventricular cardiac muscle. Subsequent to the R wave peak, the ventricles begin to contract, which correlates with the highest arterial blood pressure reading or systolic pressure.
The QRS complex has a distinctive shape and duration because the heart's structure and the pathway of the depolarization wave are complex. The atrial repolarization is masked by the QRS complex and thus is not visible on the ECG. Following ventricular depolarization and the subsequent contraction signalized by the QRS complex, the T wave represents the repolarization of the ventricles, leading to ventricular relaxation.