Long QT syndrome

Disorder of myocardial repolarization showing prolonged QT interval on EKG → increased risk of polymorphic vtach and torsades de pointes

Etiology:
Congenital: inherited, genetic abnormality
Treamtent: nonselective beta blockers: nadolol, propranolol
Acquired: antiarrhythmic drugs (quinine, sotalol, dofetilide, ibutilide), psychotropic meds (haloperidol, methadone), erythromycin, cisapride, electrolytes (hypoK, hypoMg, hypoCa), eating disorders, CAD, bradyarrhythmias
Withdraw offending etiology

[wespowers]

Thankyou for mentioning methadone. Many doctors including cardiologists leave it out or have no clue.