A) time delay in AV-node
B) SA-nodal conduction time
C) increased ventricular contraction
D) time interval between onset of ventricular contraction
Correct Answer: A
Solution :
The P-R interval is the time in seconds (usually 0.12 to 0.20 seconds) from the beginning of the P-wave to the beginning of QRS-complex. It corresponds to the time lag from the onset of atrial depolarisation to the onset of ventricular depolarisation. Prolonged P-R indicate first degree heart block.
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