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PR interval is measured from the onset of P wave to the onset of QRS complex it includes the P wave and the pr segment normal PR interval is from 120 to 200 milliseconds if it is prolonged it is called as first degree atriavender club Block PR interval is the time taken for Activation of the Atria and conduction of the impulses down to the ventricles and initiate activation of the ventricles this includes the physiological delay in conduction at the AV node the delay allows complete emptying of the Atria before the ventricles start Contracting the atrial help to ventricular filling acts like an atrial boost at the end of passive diastolic ventricular feeling isolated first degree we block our prolongation of the PR interval is not docHub if it is only moderate prolongation significance is mainly for any Associated abnormality of the heart which may progress first degree AV block can occur in healthy athletes due to the enhanced activity of the vagus nerve but this does not produce