QRS complex shows ventricular depolarization. abnormalities of QRS are related to amplitude, width and specific morphology.
PR interval is between the start of the P wave and the start of QRS. It comprises electrical conduction from the SA node to the His bundle. It lasts 120-200 ms. According to the duration of this interval and the association of P and QRS, we will have three types of atrioventricular blocks. first degree, […]