Table 2.

Tisdale score to identify hospitalized patients at risk for QT interval prolongation could lead to interventions to reduce the risk of TdP³⁸

Age ≥ 68 y Female Sex Loop Diuretic Treatment	1 point
Serum K+ ≤ 3.5mEq/L Acute myocardial infarction Admission QTc ≥ 450 msec	2 points
1-QTc-prolonging drugs 2+ QTc-prolong drugs Sepsis Heart failure hospitalization	3 points

TISDALE SCORE:

Low risk (≤6 points).

Intermediate risk (7–10 points).

High risk (≥11 points).