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A 27-year-old healthy woman with a history of childhood asthma (currently well controlled) and no other known comorbidities presents with a history of acute-onset palpitations. She reports associated light-headedness and sweating, with no history of chest pain and no other associated symptoms. There is no history of recent use of inhaled beta-agonist, or recent stimulant or drug use. The patient also does not report any family history of known cardiovascular disease. She is haemodynamically stable, and other than being markedly tachycardic examines well.
Urgent ECG with standard calibration done at the time is depicted in figure 1.
Contributors All authors contributed equally to this manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.