The reported incidence of<unk>  has ranged from 2% to 83%. The wide range of reported incidence is likely attributable to two factors which are the criteria used to define<unk>  and the therapy used to resolve that diagnosis.
Pacemaker syndrome
Pre-excitation syndrome
Takotsubo cardiomyopathy
Torsades de pointes
Primary ventricular fibrillation
Aicardi syndrome
Unstable angina
Sudden arrhythmic death syndrome