{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T12:51:38Z","timestamp":1761396698937,"version":"3.40.5"},"reference-count":22,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T00:00:00Z","timestamp":1703635200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Pacing Clinical Electrophis"],"published-print":{"date-parts":[[2024,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>The anatomic extent of the reentry circuit in idiopathic left posterior fascicular ventricular tachycardia (LPF\u2010VT) is yet to be fully elucidated. We hypothesized that entrainment mapping could be used to delineate the reentry circuit of an LPF\u2010VT, especially including the upper turnaround point.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Twenty\u2010three consecutive LPF\u2010VT patients (mean age, 29\u00a0\u00b1\u00a09 years, 18 males) were included. We performed overdrive pacing with entrainment attempts at the left bundle branch (LBB) and the left His bundle (HB) region.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overdrive pacing from the LBB region showed concealed fusion in all 23 patients (post\u2010pacing interval [PPI], 322.1\u00a0\u00b1\u00a064.3\u00a0ms; tachycardia cycle length [TCL], 319.0\u00a0\u00b1\u00a061.6\u00a0ms; PPI\u2010TCL, 3.1\u00a0\u00b1\u00a04.6\u00a0ms) with a long stimulus\u2010to\u2010QRS interval (287.9\u00a0\u00b1\u00a058.0\u00a0ms, approximately 90% of the TCL). Pacing from the same LBB region at a slightly faster pacing rate showed manifest fusion with antidromic conduction to the LBB and minimal in\u2010and\u2010out time to the LBB potential (PPI\u2010TCL, 21.3\u00a0\u00b1\u00a013.7\u00a0ms). Overdrive pacing from the left HB region showed manifest fusion with a long PPI\u2010TCL (53.9\u00a0\u00b1\u00a022.5\u00a0ms).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our pacing study results suggest that the upper turnaround point in a reentry circuit of the LPF\u2010VT may extend to the proximal His\u2010Purkinje conduction system near the LBB region but below the left HB region. The LPF may constitute the retrograde limb of the reentry circuit.<\/jats:p><\/jats:sec>","DOI":"10.1111\/pace.14905","type":"journal-article","created":{"date-parts":[[2023,12,28]],"date-time":"2023-12-28T07:38:27Z","timestamp":1703749107000},"page":"300-311","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Upper turnaround point in a reentry circuit of the idiopathic left posterior fascicular ventricular tachycardia"],"prefix":"10.1111","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9710-0945","authenticated-orcid":false,"given":"Jongmin","family":"Hwang","sequence":"first","affiliation":[{"name":"Department of Internal Medicine Heart Institute Asan Medical Center University of Ulsan College of Medicine  Seoul Republic of Korea"},{"name":"Pusan National University School of Medicine Pusan National University Yangsan Hospital  Yangsan Republic of Korea"},{"name":"Keimyung University School of Medicine Keimyung University Dongsan Hospital  Daegu Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4391-5406","authenticated-orcid":false,"given":"Gi\u2010Byoung","family":"Nam","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine Heart Institute Asan Medical Center University of Ulsan College of Medicine  Seoul Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0653-0929","authenticated-orcid":false,"given":"June Hong","family":"Kim","sequence":"additional","affiliation":[{"name":"Pusan National University School of Medicine Pusan National University Yangsan Hospital  Yangsan Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3573-638X","authenticated-orcid":false,"given":"Jun","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Internal 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