Repolarisation of the ventricles is represented by

On an electrocardiogram (ECG), the P wave represents atrial depolarisation, signaling the contraction of the atria. The QRS complex signifies ventricular depolarisation, reflecting the contraction of the ventricles. The R wave is the first positive deflection in the QRS complex. The T wave represents ventricular repolarisation, indicating the recovery of the ventricles' electrical charge after contraction. These waves collectively provide crucial information about the electrical activity of the heart during each cardiac cycle. Analysing their morphology and timing helps diagnose various cardiac conditions, including arrhythmias, ischemia, and myocardial infarction.