Question

In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of human heart?

• A. T – end of diastole
• B. P – depolarisation of Atria
• C. R – repolarisation of ventricles
• D. S – start of systole

Answer 1

The correct option is B

P – depolarisation of Atria

A typical ECG tracing of the cardiac cycle (heartbeat) consists of a P wave (atrial depolarization), a QRS complex (ventricular depolarization), and a T wave (ventricular repolarization). An additional wave, the U wave, is visible in 50 to $75\%$ of ECGs.