Normal sinus rhythm Second degree type I sinoatrial nodal exit block (SA nodal Wenckebach) This ECG strip shows second degree type I sinoatrial nodal exit block, not to be confused with AV nodal ...

This ECG demonstrates third degree heart block which may be only transient in this setting, although can persist as well.

The human heart beats 80,000-120,000 times a day. Long-term ECGs record every heartbeat, and the recording is then ...