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