<P> First - degree atrioventricular block ( AV block ) , or PR prolongation , is a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds . </P>
<P> First - degree atrioventricular block ( AV block ) , or PR prolongation , is a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds . </P>
what is first degree av block in ecg
what is first degree av block in ecg
a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds
a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds