Tisdale risk score for QT prolongation
Risk of drug-associated QTc prolongation in hospitalized cardiac patients.
Inputs
CompleteAge 68 or older
Female
Loop diuretic
Serum potassium 3.5 mEq/L or lower
Admission QTc 450 ms or longer
Acute MI
QTc-prolonging drugs
Sepsis
Heart failure
Worked calculation
Your values are highlighted.
- Points
When to use
- Before or during QT-prolonging drug therapy in hospitalized patients.
Pearls and pitfalls
- Correct potassium and magnesium; check CredibleMeds for drug risk categories.
Why use
A pharmacist-derived score for medication safety.
| Criterion | Points |
|---|---|
| Age 68 or older | +1 |
| Female | +1 |
| Loop diuretic | +1 |
| Serum potassium 3.5 mEq/L or lower | +2 |
| Admission QTc 450 ms or longer | +2 |
| Acute MI | +2 |
| QTc-prolonging drugs: None | 0 |
| One | +3 |
| Two or more | +6 |
| Sepsis | +3 |
| Heart failure | +3 |