SECOND DEGREE ATRIOVENTRICULAR (AV) BLOCK MOBITZ TYPE 1 (Wenckebach):

 

 

A progressive slowing of the conduction from the atria to the ventricles through the atrioventricular (AV) node with an eventual interruption of atrial impulse conduction.

•AV node fatigues which lengthens the PR interval and then drops a QRS complex.

•P to P interval:

PR interval:

RR interval:

•Dropped QRS complex.