ECG Components

1-P waveFirst upward deflection

Atrial depolarization

2-PR intervalBeginning foP wave to the beginning of QRS complex

Time impulse takes to travel through the atria and VA node

3- QRS complex Contains 3 waves:

The Q wave, R wave, and S wave Depolarization of ventricles

4- Q wave Negative deflection after P wave Depolarization of septum 

5- R wave First positive deflection following

P or Q wave Depolarization of ventricles 

6- S wave Negative deflection following

R wave Depolarization of ventricles

7-T wave First upward deflection after

S wave Repolarization of the ventricles