Long QT syndrome
Etiology
Etiology
Etiology
Electrolyte abnormalities
- Hypokalemia
- Hypomagnesemia
- Hypocalcemia
Drugs (selected examples) - Class Ia antiarrhythmics (quinidine, procainamide)
- Class Ic antiarrhythmics (propafenone)
- Class III antiarrhythmics (amiodarone, bretylium, sotalol)
- Tricyclic antidepressants
- Astemizole, terfenadine
- Antibiotics: erythromycin, trimethoprim-sulfamethoxazole, levofloxacin, ketoconazole, itraconazole
- Phenothiazines, haldol
- Prednisone
Miscellaneous - Congenital long QT syndrome
- Third-degree A-V block
- Second-degree A-V block
- Left ventricular hypertrophy (LVH)
- Myocardial ischemia
- Significant bradycardia
- Stroke or subarachnoid hemorrhage
- Hypothermia
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