Sudden cardiac arrest due to a single sodium channel mutation producing a mixed phenotype of Brugada and Long QT3 syndromes.
Inherited arrhythmia syndromes are a known, albeit rare, cause of sudden cardiac arrest which may present with characteristic electrocardiogram changes in patients with structurally normal heart. There are a variety of distinct arrhythmogenic syndromes that arise from mutations in voltage gated sodium channels, resulting in either gain or loss of function. We describe a patient with a primary inherited arrhythmia syndrome which presented as sudden cardiac arrest. Further workup revealed that her arrest was due to a combination of Brugada syndrome and Long QT3 syndrome secondary to a deleterious mutation of voltage-gated, sodium channel, type V alpha subunit (SCN5A Thr1709Met).
Division of Cardiology, LSUHSC Shreveport, LA, United States. Electronic address: drlumashankar@gmail.com.
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Lakshmanadoss
Department of Medicine, William Beaumont Hospital, Oakland University School of Medicine, Royal Oak, MI, United States.
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Mertens
Division of Cardiology, William Beaumont Hospital, Oakland University School of Medicine, Royal Oak, MI, United States.
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Gallagher
Division of Cardiology, William Beaumont Hospital, Oakland University School of Medicine, Royal Oak, MI, United States.
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Kutinsky
Division of Cardiology, William Beaumont Hospital, Oakland University School of Medicine, Royal Oak, MI, United States.
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Williamson
Brugada syndrome; LQT3 syndrome; SCN5A mutation; Sudden cardiac arrest
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