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, Second-degree Mobitz-I, and Mobitz-II and the one is complete heart block.


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