Arrhythmogenic right ventricular dysplasia (ARVD) is a heart muscle disease characterized pathologically by fibrofatty replacement of right ventricular myocardium. It is further characterized by an electrical instability that precipitates ventricular arrhythmias and sudden death. The prevalence is estimated at 0.4% depending on geographic circumstances. The incidence of sudden death in patients with ARVD is approximately 2.5% a year. The disease is often familial with an autosomal inheritance. We report a case of a 35-year-old woman with ARVD and a patent foramen ovale discovered after accidental placement of the defibrillator probe in the left ventricle. To avoid malpositioning of a defibrillator probe postoperative control should be performed using different diagnostic modalities.
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