{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T21:42:22Z","timestamp":1776894142970,"version":"3.51.2"},"reference-count":21,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2004,11,29]],"date-time":"2004-11-29T00:00:00Z","timestamp":1101686400000},"content-version":"vor","delay-in-days":28,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2004,11]]},"abstract":"<jats:p> <jats:italic>Introduction:<\/jats:italic> Previous literature has documented the association between narrow QRS supraventricular tachycardia (SVT) and pronounced ST\u2010T segment change. The aim of this study was to evaluate repolarization changes during SVT initiation and demonstrate the possible mechanism.<\/jats:p><jats:p> <jats:italic>Methods and Results:<\/jats:italic> Fifty\u2010one consecutive patients (20 men and 31 women; mean age 46.1 \u00b1 16.4 years) with narrow QRS SVT (32 patients with AV nodal reentrant tachycardia and 19 patients with AV reentrant tachycardia) were included. We retrospectively analyzed the intracardiac recordings and ST\u2010T segment changes on 12\u2010lead surface ECGs during SVT initiation. Twenty\u2010six (51%) patients developed ST segment repolarization changes during SVT initiation. Patients with shorter baseline sinus cycle length, shorter tachycardia cycle length, elevated systolic blood pressure before tachycardia induction, and greater reduction of systolic blood pressure had a higher incidence of repolarization changes. However, multivariate analysis showed that reduction of systolic blood pressure after SVT induction was the only independent predictor of repolarization changes. Furthermore, the maximal degree of ST segment depression during SVT correlated with the reduction of systolic blood pressure (r = 0.75, P &lt; 0.001).<\/jats:p><jats:p> <jats:italic>Conclusion:<\/jats:italic> Repolarization changes during SVT initiation were caused mainly by concurrent hemodynamic change after SVT initiation with abrupt cycle length shortening.<\/jats:p>","DOI":"10.1046\/j.1540-8167.2004.04049.x","type":"journal-article","created":{"date-parts":[[2004,12,26]],"date-time":"2004-12-26T20:29:04Z","timestamp":1104092944000},"page":"1233-1237","source":"Crossref","is-referenced-by-count":8,"title":["Mechanism of Repolarization Change During Initiation of Supraventricular 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