{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T09:23:28Z","timestamp":1769073808064,"version":"3.49.0"},"reference-count":21,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"17","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Circulation"],"published-print":{"date-parts":[[1999,10,26]]},"abstract":"<jats:p>\n            <jats:italic>Background<\/jats:italic>\n            \u2014Different responses to entrainment have been reported in relation to the pacing site of a variety of tachycardias. However, transient entrainment of bundle-branch reentrant tachycardia (BBRT) has not been investigated systematically.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Methods and Results<\/jats:italic>\n            \u2014We attempted entrainment of 13 BBRTs in 9 patients by pacing first the right ventricle and then the right atrium. The initial pacing cycle length (CL) was 10 ms faster than the tachycardia CL. Subsequent pacing sequences were performed with 5- to 10-ms CL decrements until tachycardia termination or loss of postatropine 1:1 AV conduction. Both full ventricular-paced and AV-conducted QRS complex references were obtained during sinus rhythm pacing from the same sites and with similar CL as during entrainment. Transient entrainment was achieved by ventricular and atrial stimulation in 11 and 8 tachycardias, respectively. Constant fusion was always present during entrainment by ventricular stimulation. There was no change in the QRS complex (orthodromically concealed fusion) during entrainment by atrial stimulation in 6 of 6 tachycardias with left bundle-branch block morphology and in 1 of 2 tachycardias with right bundle-branch block morphology.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Conclusions<\/jats:italic>\n            \u2014BBRT, especially if it has a left bundle-branch block morphology, can be differentiated from other wide-QRS-complex tachycardia mechanisms through analysis of the ECGs recorded during tachycardia entrainment by atrial and ventricular stimulation. This diagnostic approach may be especially useful when it is difficult to record a stable or sufficiently sized His bundle electrogram or when spontaneous changes in the ventricular CL precede similar changes in the His bundle CL.\n          <\/jats:p>","DOI":"10.1161\/01.cir.100.17.1784","type":"journal-article","created":{"date-parts":[[2012,6,12]],"date-time":"2012-06-12T00:42:29Z","timestamp":1339461749000},"page":"1784-1790","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":34,"title":["Transient Entrainment of Bundle-Branch Reentry by Atrial and Ventricular Stimulation"],"prefix":"10.1161","volume":"100","author":[{"given":"Jose L.","family":"Merino","sequence":"first","affiliation":[{"name":"From the Arrhythmia Unit, Department of Cardiology, Hospital La Paz, Universidad Auto\u0301noma, Madrid, Spain."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rafael","family":"Peinado","sequence":"additional","affiliation":[{"name":"From the Arrhythmia Unit, Department of Cardiology, Hospital La Paz, Universidad Auto\u0301noma, Madrid, Spain."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ignacio","family":"Ferna\u0301ndez-Lozano","sequence":"additional","affiliation":[{"name":"From the Arrhythmia Unit, Department of Cardiology, Hospital La Paz, Universidad Auto\u0301noma, Madrid, Spain."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicolas","family":"Sobrino","sequence":"additional","affiliation":[{"name":"From the Arrhythmia Unit, Department of Cardiology, Hospital La Paz, Universidad Auto\u0301noma, Madrid, Spain."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose A.","family":"Sobrino","sequence":"additional","affiliation":[{"name":"From the Arrhythmia Unit, Department of Cardiology, Hospital La Paz, Universidad Auto\u0301noma, Madrid, Spain."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","reference":[{"key":"e_1_3_2_1_2","doi-asserted-by":"publisher","DOI":"10.1161\/circ.79.2.2914345"},{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1161\/circ.98.6.541"},{"key":"e_1_3_2_3_2","unstructured":"Merino JL Peinado R Sobrino JA. Sudden death in myotonic dystrophy: the potential role of bundle-branch reentry. Circulation. In press. 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