Tisdale Risk Score for QT Prolongation
Tisdale QT-prolongation risk score (Tisdale 2013): age ≥ 68 (1), female (1), loop diuretic (1), K ≤ 3.5 (2), admission QTc ≥ 450 ms (2), acute MI (2), sepsis (3), heart failure (3), QT-prolonging drugs (one 3, ≥ two 6).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Sepsis
- Yes
- Heart failure
- Yes
- Age ≥ 68 years
- Yes
Result: Tisdale QT risk 7/21: moderate (7-10) risk of drug-associated QTc prolongation.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Score 0-21
- age >= 68 (1), female (1), loop diuretic (1), K <= 3.5 (2), QTc >= 450 (2), acute MI (2), sepsis (3), heart failure (3), QT drugs (one 3, >= two 6).
- Risk band
- low <= 6, moderate 7-10, high >= 11 for drug-associated QTc prolongation. Takes the entered admission QTc, not a raw tracing. Cross-links qtc-suite.
What you enter
- Age ≥ 68 years
- Female sex
- Loop diuretic
- Serum potassium ≤ 3.5 mEq/L
- Admission QTc ≥ 450 ms
- Acute MI
- Sepsis
- Heart failure
- QT-prolonging drugs
How this is calculated
Tisdale JE, Jaynes HA, Kingery JR, et al. Development and validation of a risk score to predict QT interval prolongation in hospitalized patients. Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.