{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T04:06:22Z","timestamp":1749787582871,"version":"3.41.0"},"reference-count":5,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2025,4,21]],"date-time":"2025-04-21T00:00:00Z","timestamp":1745193600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Cardiovasc electrophysiol"],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>A 22\u2010year\u2010old male with no cardiovascular history presented with frequent symptomatic ventricular premature contractions (VPCs) with multiple QRS morphologies despite bisoprolol treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The coupling intervals progressively increased from VPC1 to VPC3, and VPC2 was the most frequent. The earliest activation site was identified at the left\u2010right coronary cusp junction. Single ventricular extrastimuli with variable coupling intervals from this site successfully reproduced QRS morphologies identical to VPC1\u20103.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This case illustrated how a single focus VPC could exhibit multiform morphology due to varying fusion with intrinsic conduction and the importance of coupling interval\u2010matched extrastimuli in identifying the origin.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jce.16684","type":"journal-article","created":{"date-parts":[[2025,4,21]],"date-time":"2025-04-21T13:26:23Z","timestamp":1745241983000},"page":"1436-1439","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Case of Ventricular Premature Contractions With Multiple Morphologies Reproduced by a Single Ventricular Extrastimulus With Different Coupling Intervals"],"prefix":"10.1111","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6971-646X","authenticated-orcid":false,"given":"Naoyuki","family":"Miwa","sequence":"first","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2116-3127","authenticated-orcid":false,"given":"Tadanori","family":"Nakata","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3388-2508","authenticated-orcid":false,"given":"Satoshi","family":"Hara","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomohiro","family":"Tahara","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taiki","family":"Ishizawa","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hidenori","family":"Hirano","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3939-4954","authenticated-orcid":false,"given":"Yoshikazu","family":"Sato","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3781-2171","authenticated-orcid":false,"given":"Shigeki","family":"Kusa","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2808-1933","authenticated-orcid":false,"given":"Hitoshi","family":"Hachiya","sequence":"additional","affiliation":[{"name":"Department of Cardiology Tsuchiura Kyodo General Hospital Ibaraki 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Electrophysiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/jce.16684","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T12:48:08Z","timestamp":1749732488000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/jce.16684"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4,21]]},"references-count":5,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2025,6]]}},"alternative-id":["10.1111\/jce.16684"],"URL":"https:\/\/doi.org\/10.1111\/jce.16684","archive":["Portico"],"relation":{},"ISSN":["1045-3873","1540-8167"],"issn-type":[{"type":"print","value":"1045-3873"},{"type":"electronic","value":"1540-8167"}],"subject":[],"published":{"date-parts":[[2025,4,21]]},"assertion":[{"value":"2024-10-11","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication 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