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What is the effect of decrease of the AVN conduction on P-R interval of ECG?

AVN conduction ECG interval
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What is the effect of decrease of the AVN conduction on P-R interval of ECG?

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The duration of the P-R is proportional to the delay of conduction in the AVN. Normal PR interval is 0.12-0.20 sec; if it is more than 0.2; this is called first degree heart block.

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