{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T13:30:59Z","timestamp":1787059859744,"version":"build-2736575974"},"reference-count":28,"publisher":"Bioscientifica","issue":"2","license":[{"start":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T00:00:00Z","timestamp":1783036800000},"content-version":"vor","delay-in-days":93,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["journals.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,4,1]]},"abstract":"<jats:sec>\n                    <jats:title>Summary<\/jats:title>\n                    <jats:p>Thyroid storm is a life-threatening endocrine emergency characterized by severe thyrotoxicosis and multisystem decompensation. Cardiovascular involvement is common and the leading cause of mortality, most commonly presenting with atrial fibrillation or high-output heart failure. Malignant ventricular arrhythmias, however, are exceedingly rare, reported in 0.07% of hospitalizations for thyroid dysfunction and 13% of patients with thyroid storm admitted to intensive care units. We present a case of a previously healthy young woman with uncontrolled Graves\u2019 disease who developed out-of-hospital cardiac arrest due to ventricular fibrillation. Coronary angiography revealed diffuse coronary vasospasm without obstructive coronary artery disease, suggesting myocardial ischemia as the precipitating mechanism. She achieved complete neurological and hemodynamic recovery following resuscitation, initiation of antithyroid therapy, beta-blockade, corticosteroids, and restoration of euthyroidism. This case underscores the potential of thyroid storm to induce life-threatening ventricular arrhythmias through a combination of coronary vasospasm, sympathetic overactivity, and altered myocardial excitability. Recognition of thyrotoxicosis as a potential cause of cardiac arrest is crucial, particularly in patients without structural heart disease, since early diagnosis and timely treatment are key to survival and prevention of recurrence.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Learning points<\/jats:title>\n                  <\/jats:sec>","DOI":"10.1530\/edm-25-0176","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T16:52:55Z","timestamp":1776099175000},"update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-2","source":"Crossref","is-referenced-by-count":0,"title":["Cardiac arrest as the initial presentation of thyrotoxicosis in a young woman"],"prefix":"10.1530","volume":"2026","author":[{"given":"Maria Helena","family":"Siqueira Tavares de Melo","sequence":"first","affiliation":[{"name":"Jefferson Einstein Philadelphia Hospital, Philadelphia, Pennsylvania, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8709-2064","authenticated-orcid":true,"given":"Maxim John Levy","family":"Barnett","sequence":"additional","affiliation":[{"name":"Jefferson Einstein Philadelphia Hospital, Philadelphia, Pennsylvania, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria L M","family":"Rego","sequence":"additional","affiliation":[{"name":"Jefferson Einstein Philadelphia Hospital, Philadelphia, Pennsylvania, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evan","family":"Isaacs","sequence":"additional","affiliation":[{"name":"Jefferson Einstein Philadelphia Hospital, Philadelphia, Pennsylvania, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elilta","family":"Desta","sequence":"additional","affiliation":[{"name":"Jefferson Einstein Philadelphia Hospital, Philadelphia, Pennsylvania, 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