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Figure 1: Top strip: ventricular bigeminy with prolonged PR interval of the successive sinus beats. Middle strip: progressive prolongation of the PR interval of the successive sinus beats followed by AV block in every third sinus beat. Bottom strip: AV block of alternate sinus beats following the ventricular ectopics

Figure 1: Top strip: ventricular bigeminy with prolonged PR interval of the successive sinus beats. Middle strip: progressive prolongation of the PR interval of the successive sinus beats followed by AV block in every third sinus beat. Bottom strip: AV block of alternate sinus beats following the ventricular ectopics