Torsades De Pointes Electrical Storm Induced by H1N1 in a Patient with KCNH2 Variant of Unknown Significance

Table 1

Causes of polymorphic ventricular arrhythmia [1].

Structural heart diseases	Structurally normal heart
(i) Ischemic heart diseases; (ii) Acute or recent myocardial infarction, prior myocardial infarction; (iii) Nonischemic cardiomyopathy; (iv) Dilated cardiomyopathy; (v) Hypertrophic cardiomyopathy; (vi) Arrhythmogenic right ventricular dysplasia/cardiomyopathy; (vii) Valvular heart diseases; (viii) Corrected congenital heart diseases; (ix) Myocarditis; (x) Cardiac sarcoidosis; (xi) Chagas disease; (xii) Metastatic cardiac tumor	Primary causes	Secondary causes
	(i) Idiopathic; (ii) Brugada syndrome; (iii) Early repolarization syndrome; (iv) Long QT syndrome; (v) Short QT syndrome; (vi) Catecholaminergic polymorphic ventricular tachycardia	(i) Electrolyte abnormalities; (ii) Toxic/drug-related; (iii) Endocrinologic; (iv) Perioperative; (v) Iatrogenic (T-wave pacing)