In ECG, P-R interval corresponds to

Options

A. time delay in A-V node
B. S-A nodal conduction time
C. increased ventricular contraction
D. time interval between onset of ventricular contraction

Answer

A

Explanation

In ECG, P-R interval is the time from the beginning of the P wave to the beginning of the ORS complex. It corresponds to the time lag from the onset of atrial depolarisation to the onset of ventricular depolarisation. Most of the delay occurs in the AV node.