Reentry (Echo) Beats of Ventricular Origin
Report:
Sinus rhythm
VEBs
Bigeminal
Couplets & triplets
Retrograde VA conduction
First degree VA block
Wenckebach conduction
Reentry
Post-ectopic sino-atrial depression
Junctional escape beats
Comment:
There are two reentry beats: third last in the top strip and fourth in the bottom strip. Both are preceded by an inverted P wave with RP interval much longer than the previous RP interval. This is the usual setting for reentry to occur. The antegrade conduction time is much shorter here, at 0.14”; it may indicate separate antegrade and retrograde pathways.
The sino-atrial depression sets in with the occurrence of retrograde conduction toward the end of the top strip. Before that, the sinus P waves prevent retrograde conduction by falling on the ST segment of the VEBs.
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