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His symptoms resolved spontaneously within minutes. A 12-lead ECG revealed an irregularly irregular rhythm, with baseline tachycardia of 110 beats per minute, consistent with a diagnosis of AF.<\/jats:p>","DOI":"10.1136\/bcr-2025-266306","type":"journal-article","created":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T14:40:13Z","timestamp":1765982413000},"page":"e266306","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Atrial fibrillation in a paediatric athlete"],"prefix":"10.1136","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7030-4585","authenticated-orcid":false,"given":"Adriel","family":"Roa-Bautista","sequence":"first","affiliation":[{"name":"Child Health, University Hospitals of North Midlands NHS Trust, Stoke-on-Trent, England, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joanne","family":"Stock","sequence":"additional","affiliation":[{"name":"Child Health, University Hospitals of North Midlands NHS Trust, 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