Which interval measures the total time of the ventricular contraction?

The interval that measures the total time of ventricular contraction is the Q to T interval. This interval reflects the duration from the start of ventricular depolarization, represented by the Q wave, to the end of ventricular repolarization, indicated by the T wave. The Q to T interval encompasses the entire process of ventricular contraction (systole), as it includes both the action potential necessary for contraction and the subsequent repolarization process that prepares the ventricles for the next heartbeat. Understanding this interval is crucial for assessing the overall time of ventricular activity and can be important in various clinical contexts, including conditions that affect ventricular function or rhythm.