Table 1: Risk score for drug associated QTc prolongation [9].
| Risk factor | Points |
| Age ≥ 68 y | 1 |
| Female sex | 1 |
| Loop diuretic | 1 |
| Acute myocardial infarction | 2 |
| Admission QTc ≥ 450 ms | 2 |
| Serum K + ≤ 3.5 mEq/L | 2 |
| Sepsis | v |
| Heart failure | 3 |
| One QTc-prolonging drug | 3 |
| ≥ 2 QTc-prolonging drugs | 3 |
| Maximum Risk Score | 21 |