{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T19:55:30Z","timestamp":1792439730562,"version":"4.5.0"},"reference-count":4,"publisher":"Elsevier BV","issue":"30","license":[{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"},{"start":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T00:00:00Z","timestamp":1781740800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["clinicalkey.com","clinicalkey.com.au","clinicalkey.es","clinicalkey.fr","clinicalkey.jp","jacc.org","elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["JACC: Case Reports"],"published-print":{"date-parts":[[2026,7]]},"DOI":"10.1016\/j.jaccas.2026.109304","type":"journal-article","created":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T19:24:40Z","timestamp":1785353080000},"page":"109304","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":0,"title":["An Abrupt Doubling of Heart Rate"],"prefix":"10.1016","volume":"31","author":[{"given":"Mazen M.","family":"Kawji","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"issue":"6","key":"10.1016\/j.jaccas.2026.109304_bib1","article-title":"The subtle pattern of sinoatrial wenckebach","volume":"31","author":"Alomari","year":"2026","journal-title":"JACC Case Rep"},{"key":"10.1016\/j.jaccas.2026.109304_bib2","doi-asserted-by":"crossref","first-page":"3855","DOI":"10.1016\/S0735-1097(23)04299-7","article-title":"Not a respiratory arrhythmia: second degree sinoatrial exit block as the first sign of a right ventricular myocardial infarction","volume":"81","author":"Varrias","year":"2023","journal-title":"J Am Coll Cardiol"},{"issue":"1","key":"10.1016\/j.jaccas.2026.109304_bib3","article-title":"Lyme carditis manifesting with sinoatrial exit block: a case report","volume":"6","author":"Buscher","year":"2022","journal-title":"Eur Heart J Case Rep"},{"issue":"7","key":"10.1016\/j.jaccas.2026.109304_bib4","doi-asserted-by":"crossref","first-page":"932","DOI":"10.1016\/j.jacc.2018.10.043","volume":"74","author":"Kusumoto","year":"2019","journal-title":"J Am Coll Cardiol"}],"container-title":["JACC: Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S2666084926024654?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S2666084926024654?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T19:38:30Z","timestamp":1792438710000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S2666084926024654"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7]]},"references-count":4,"journal-issue":{"issue":"30","published-print":{"date-parts":[[2026,7]]}},"alternative-id":["S2666084926024654"],"URL":"https:\/\/doi.org\/10.1016\/j.jaccas.2026.109304","relation":{},"ISSN":["2666-0849"],"issn-type":[{"value":"2666-0849","type":"print"}],"subject":[],"published":{"date-parts":[[2026,7]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"An Abrupt Doubling of Heart Rate","name":"articletitle","label":"Article Title"},{"value":"JACC: Case Reports","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/j.jaccas.2026.109304","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"\u00a9 2026 The Authors. Published by Elsevier on behalf of the American College of Cardiology Foundation.","name":"copyright","label":"Copyright"}],"article-number":"109304"}}