ECG
ECG with:
Progressive prolongation of PR interval on consecutive beats
Dropped QRS beat not conducted to ventricle after maximal PR prolongation
After dropped QRS complex, PR interval resets and again begins the cycle of progressive prolongation
Progressive prolongation of PR interval on consecutive beats
Dropped QRS beat not conducted to ventricle after maximal PR prolongation
After dropped QRS complex, PR interval resets and again begins the cycle of progressive prolongation
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