Usually asymptomatic
Those who are symptomatic may present with:
Lightheadedness/dizziness
Presyncope or syncope
Lightheadedness/dizziness
Presyncope or syncope
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