Exercise-induced arrhythmia refers to an abnormal heart rhythm that is triggered or worsened by physical exertion. In a normal heart, exercise causes a controlled increase in heart rate. In people with certain underlying conditions, exertion can provoke ventricular tachycardia, ventricular fibrillation, or other dangerous rhythms.
Conditions associated with exercise-induced arrhythmia include CPVT (Catecholaminergic Polymorphic Ventricular Tachycardia), Long QT Syndrome, hypertrophic cardiomyopathy, and ARVC. Exercise-induced arrhythmia is a common cause of sudden cardiac arrest in young athletes.
Diagnosis involves an exercise tolerance test (ETT) and may include electrophysiology study (EPS) and Holter monitor recording. Management depends on the underlying cause and may include medication (such as beta-blockers), ICD implantation, ablation, and specific exercise restrictions. Any cardiac arrest survivor whose event occurred during physical activity should receive a thorough investigation for exercise-induced arrhythmia as part of their post-arrest workup.
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