Vast majority are asymptomatic and diagnosed by chance
Exercise may reveal decreased tolerance (especially when there is markedly prolonged PR interval and with left ventricular systolic dysfunction)
First degree AV block
Third degree AV block
Second degree AV block type I 
Left bundle branch block
Second degree AV block type II
Wide-complex tachycardia
Narrow-complex tachycardia
AV dissociation without complete heart block