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Risk factors for QT prolongation and torsades de pointes
| General risk factors | Illness-related risk factors |
|---|---|
| Congenital long QT syndrome3 | Hypokalemia5 |
| Use of multiple QT-prolonging medications16 | Hypomagnesemia5 |
| Female sex3 | Sepsis16 |
| Myocardial injury, ischemia, or heart failure16 | |
| Renal impairment16 | |
| Bradycardia (heart rate <60 bpm)5 | |
| Recent conversion from atrial fibrillation3 |
