Question
Draw a standard ECG and explain the different segments in it.
Solution
i. P wave - It represents the electrical excitation of the atria or the depolarisation of the atria. It represents the contraction of both the atria.
ii. QRS complex - It represents the depolarisation of the ventricles which initiates the ventricular contraction. The contractions start shortly after Q and marks the beginning of the systole.
iii. T- Wave - It represents the return of ventricles from excites to normal state (repolarisation). The end of the T- wave marks the end of systole.
