{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T13:27:44Z","timestamp":1762003664429},"reference-count":15,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2003,12,15]],"date-time":"2003-12-15T00:00:00Z","timestamp":1071446400000},"content-version":"vor","delay-in-days":14,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2003,12]]},"abstract":"<jats:p> <jats:italic>Introduction:<\/jats:italic> The incidence of spontaneous transition of 2:1 AV block to 1:1 AV conduction during AV nodal reentrant tachycardia has not been well reported. Among previous studies, controversy also existed about the site of the 2:1 AV block during AV nodal reentrant tachycardia.<\/jats:p><jats:p> <jats:italic>Methods and Results:<\/jats:italic> In patients with 2:1 AV block during AV nodal reentrant tachycardia, the incidence of spontaneous transition of 2:1 AV block to 1:1 AV conduction and change of electrophysiologic properties during spontaneous transition were analyzed. Among the 20 patients with 2:1 AV block during AV nodal reentrant tachycardia, a His\u2010bundle potential was absent in blocked beats during 2:1 AV block in 8 patients, and the maximal amplitude of the His\u2010bundle potential in the blocked beats was the same as that in the conducted beats in 4 patients and was significantly smaller than that in the conducted beats in 8 patients (0.49 \u00b1 0.25 mV vs 0.16 \u00b1 0.07 mV, P = 0.007). Spontaneous transition of 2:1 AV block to 1:1 AV conduction occurred in 15 (75%) of 20 patients with 2:1 AV block during AV nodal reentrant tachycardia. Spontaneous transition of 2:1 AV block to 1:1 AV conduction was associated with transient right and\/or left bundle branch block. The 1:1 AV conduction with transient bundle branch block was associated with significant His\u2010ventricular (HV) interval prolongation (66 \u00b1 19 ms) compared with 2:1 AV block (44 \u00b1 6 ms, P &lt; 0.01) and 1:1 AV conduction without bundle branch block (43 \u00b1 6 ms, P &lt; 0.01).<\/jats:p><jats:p> <jats:italic>Conclusion:<\/jats:italic> The 2:1 AV block during AV nodal reentrant tachycardia is functional; the level of block is demonstrated to be within or below the His bundle in a majority of patients with 2:1 AV block during AV nodal reentrant tachycardia, and a minority are possibly high in the junction between the AV node and His bundle. <jats:italic>(J Cardiovasc Electrophysiol, Vol. 14, pp. 1337\u20101341, December 2003)<\/jats:italic><\/jats:p>","DOI":"10.1046\/j.1540-8167.2003.03198.x","type":"journal-article","created":{"date-parts":[[2003,12,15]],"date-time":"2003-12-15T18:07:49Z","timestamp":1071511669000},"page":"1337-1341","source":"Crossref","is-referenced-by-count":17,"title":["Spontaneous Transition of 2:1 Atrioventricular Block to 1:1 Atrioventricular Conduction During Atrioventricular Nodal Reentrant Tachycardia:"],"prefix":"10.1111","volume":"14","author":[{"given":"SHIH\u2010HUANG","family":"LEE","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"CHING\u2010TAI","family":"TAI","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"CHERN\u2010EN","family":"CHIANG","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"WEN\u2010CHUNG","family":"YU","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JUN\u2010JACK","family":"CHENG","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"YU\u2010AN","family":"DING","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"MAU\u2010SONG","family":"CHANG","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"SHIH\u2010ANN","family":"CHEN","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2003,12,15]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.53.4.595"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8159.1988.tb03946.x"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0735-1097(10)80067-1"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/clc.4960161209"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8167.1994.tb01291.x"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0735-1097(96)00415-9"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8159.1996.tb04220.x"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8167.1997.tb00818.x"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.93.11.2023"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.95.11.2541"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0733-8651(18)30350-3"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199207303270504"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.41.6.947"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.51.1.68"},{"key":"e_1_2_6_16_2","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1136\/hrt.45.1.67","article-title":"Anatomico\u2010electrophysiological 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Block"],"short-title":[],"issued":{"date-parts":[[2003,12]]},"references-count":15,"journal-issue":{"issue":"12","published-print":{"date-parts":[[2003,12]]}},"alternative-id":["10.1046\/j.1540-8167.2003.03198.x"],"URL":"https:\/\/doi.org\/10.1046\/j.1540-8167.2003.03198.x","archive":["Portico"],"relation":{},"ISSN":["1045-3873","1540-8167"],"issn-type":[{"value":"1045-3873","type":"print"},{"value":"1540-8167","type":"electronic"}],"subject":[],"published":{"date-parts":[[2003,12]]}}}