Also known as a Mobitz I or Wenkebach AV block
Disturbance of atrial impulse conducting through the AV node
Considered more benign than Mobitz II as it is not associated with histological changes
Second degree AV block type I
First degree AV block
Third degree AV block
Second degree AV block type I 
Second degree AV block type II
Wide-complex tachycardia
Narrow-complex tachycardia
AV dissociation without complete heart block