{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T07:06:41Z","timestamp":1762067201387},"reference-count":0,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"2","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Circulation"],"published-print":{"date-parts":[[1969,8]]},"abstract":"<jats:p>A case of atrial tachysystole with apparent exit block is reported in which the basic cycle length of atrial activity is 260 msec. Simultaneous right intra-atrial electrograms show cycle lengths of 510 to 780 msec which are roughly multiples of 260 msec establishing the diagnosis of exit block. Rapid atrial stimulation (1,200\/min) to overdrive the rapid ectopic atrial pacemaker was only transiently successful in converting the arrhythmia to atrial fibrillation with a slower ventricular response. Two days later the rhythm converted to normal sinus rhythm (cycle length, 600 msec) with periods of sino-atrial block measuring 2,400 and 1,240 msec. Atrial rate further slowed so that the patient ultimately required a permanent demand pacemaker.<\/jats:p>\n          <jats:p>The case supports the theory of repetitive discharge from an ectopic atrial pacemaker to explain the mechanism producing atrial tachysystoles that simulate atrial flutter.<\/jats:p>","DOI":"10.1161\/01.cir.40.2.179","type":"journal-article","created":{"date-parts":[[2012,6,11]],"date-time":"2012-06-11T23:27:25Z","timestamp":1339457245000},"page":"179-184","update-policy":"http:\/\/dx.doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Atrial Tachysystole (Flutter?) with Apparent Exit Block"],"prefix":"10.1161","volume":"40","author":[{"given":"ROGER P.","family":"JAVIER","sequence":"first","affiliation":[{"name":"From the Cardio-Pulmonary Laboratory, Division of Cardiology, Department of Medicine, Mount Sinai Hospital, Miami Beach, Florida."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"ONKAR S.","family":"NARULA","sequence":"additional","affiliation":[{"name":"From the Cardio-Pulmonary Laboratory, Division of Cardiology, Department of Medicine, Mount Sinai Hospital, Miami Beach, Florida."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"PHILIP","family":"SAMET","sequence":"additional","affiliation":[{"name":"From the Cardio-Pulmonary Laboratory, Division of Cardiology, Department of Medicine, Mount Sinai Hospital, Miami Beach, Florida."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","container-title":["Circulation"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ahajournals.org\/doi\/pdf\/10.1161\/01.CIR.40.2.179","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,5,12]],"date-time":"2024-05-12T14:00:03Z","timestamp":1715522403000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ahajournals.org\/doi\/10.1161\/01.CIR.40.2.179"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1969,8]]},"references-count":0,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1969,8]]}},"alternative-id":["10.1161\/01.CIR.40.2.179"],"URL":"https:\/\/doi.org\/10.1161\/01.cir.40.2.179","relation":{},"ISSN":["0009-7322","1524-4539"],"issn-type":[{"value":"0009-7322","type":"print"},{"value":"1524-4539","type":"electronic"}],"subject":[],"published":{"date-parts":[[1969,8]]},"assertion":[{"value":"1969-08-01","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}