A-V Blocks

Atrioventricular Blocks Classifications Incomplete–1st degree, 2nd degree Complete — 3rd degree First degree Characterized pr interval greater than 0.20 sec.  Junctional tissue delays impulse longer than normal. Second degree Every atrial impulse no conducted through to the ventricles — PR interval may be normal, shortened, or prolonged, but there are more P waves than QRS’s. […]