Tag Archives: ECG PR Interval

Cardiovascular Board Review. Electrophysiology and Pacemaker, Part 5 (ECG)

ECG Education: PR Interval

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, […]