Match the letters in the following image of an ECG with the

Match the letters in the following image of an ECG with the appropriate part of the cardiac cycle below. A. Ventricle systole B. ventricular diastole C. Atrial contraction D. SA node fires E. Pause at AV node while filling of ventricles completes

Solution

1) SA node fires and starts atrial contaractions.

2) atrial contaractions continue

3) pause at AV node while filling of ventricles completes.

4) ventricular systole

5) ventricular diastole

ECG is agraphic representation of sequence of myocardial depolarisation and repolarisation. Each normal cardiac cycle represents