{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T23:17:27Z","timestamp":1785539847904,"version":"3.56.0"},"reference-count":22,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2009,2,27]],"date-time":"2009-02-27T00:00:00Z","timestamp":1235692800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2009,7]]},"abstract":"<jats:p> <jats:bold>\n            <jats:italic>Introduction:<\/jats:italic>\n          <\/jats:bold> Defining whether retrograde ventriculoatrial (V\u2010A) conduction is via the AV node (AVN) or an accessory pathway (AP) is important during ablation procedures for supraventricular tachycardia (SVT). With the introduction of ventricular extrastimuli (VEST), retrograde right bundle branch block (RBBB) may occur, prolonging the V\u2010H interval, but only when AV node conduction is present. We hypothesized that when AP conduction was present, the V\u2010A interval would increase less than the V\u2010H interval, whereas with retrograde nodal conduction, the V\u2010A interval would increase at least as much as the V\u2010H interval.<\/jats:p><jats:p> <jats:bold>\n            <jats:italic>Methods and Results:<\/jats:italic>\n          <\/jats:bold> We retrospectively reviewed the electrophysiological studies of patients undergoing ablation for AVN reentrant tachycardia (AVNRT) (55) or AVRT (50), for induction of retrograde RBBB during the introduction of VEST, and the change in the measured V\u2010H and V\u2010A intervals. Results were found to be reproducible between independent observers. Out of 105 patients, 84 had evidence of induced retrograde RBBB. The average V\u2010H interval increase with induction of RBBB was 53.7 ms for patients with AVRT and 54.4 ms for patients with AVNRT (P = NS). The average V\u2010A interval increase with induction of RBBB was 13.6 ms with AVRT and 70.1 ms with AVNRT (P &lt; 0.001). All patients with a greater V\u2010H than V\u2010A interval change had AVRT, and those with a smaller had AVNRT.<\/jats:p><jats:p> <jats:bold>\n            <jats:italic>Conclusions:<\/jats:italic>\n          <\/jats:bold> Induction of retrograde RBBB during VEST is common during an electrophysiological study for SVT. The relative change in the intervals during induction of RBBB accurately differentiates between retrograde AVN and AP conduction.<\/jats:p>","DOI":"10.1111\/j.1540-8167.2009.01447.x","type":"journal-article","created":{"date-parts":[[2009,2,27]],"date-time":"2009-02-27T15:49:22Z","timestamp":1235749762000},"page":"751-758","source":"Crossref","is-referenced-by-count":18,"title":["Utilization of Retrograde Right Bundle Branch Block to Differentiate Atrioventricular Nodal from Accessory Pathway Conduction"],"prefix":"10.1111","volume":"20","author":[{"given":"SURAJ","family":"KAPA","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"BENHUR 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