❤️ Tisdale Risk Score (QTc Prolongation)
UseWhen to use: before starting or combining QTc-prolonging drugs in hospital.
Strata≤6 low; 7–10 moderate; ≥11 high risk of QTc ≥500 ms.
LimitsWhen not to use: replacing continuous telemetry judgment in ACS. · Pitfall: missing hidden QT drugs. · Not a sole stop-order.
SourceTisdale et al. QTc prolongation risk score (Circ Cardiovasc Qual Outcomes 2013)
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
0–21 points.
When to use
When to use: before starting or combining QTc-prolonging drugs in hospital.
How it works
Sum published points (age, sex, loop, K⁺, QTc, MI, sepsis, HF, drugs); max 21.
Key points
- 0–21 points.
- Drug category +3.
- Next: replete K/Mg / review meds.
References
- Tisdale et al. QTc prolongation risk score (Circ Cardiovasc Qual Outcomes 2013)
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Age ≥68 years | No (0) |
|---|---|
| Female sex | No (0) |
| Loop diuretic | No (0) |
| Serum K⁺ ≤3.5 mEq/L | No (0) |
| Admission QTc ≥450 ms | No (0) |
| Acute MI | No (0) |
| Sepsis | No (0) |
| Heart failure | No (0) |
| QTc-prolonging drugs | One (+3) |
→Tisdale3/21
- Drug points：3
- Cue：≤6 — low risk of QTc >500 ms
| Age ≥68 years | No (0) |
|---|---|
| Female sex | No (0) |
| Loop diuretic | No (0) |
| Serum K⁺ ≤3.5 mEq/L | No (0) |
| Admission QTc ≥450 ms | No (0) |
| Acute MI | No (0) |
| Sepsis | No (0) |
| Heart failure | No (0) |
| QTc-prolonging drugs | None (0) |
→Tisdale0/21
- Drug points：0
- Cue：≤6 — low risk of QTc >500 ms
Verification & sources · governance
FAQ
Frequently asked questions
- Does Tisdale Risk Score (QTc Prolongation) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Tisdale Risk Score (QTc Prolongation) calculated in practice? Can you show a worked example?
- Inputs: Age ≥68 years No (0), Female sex No (0), Loop diuretic No (0), Serum K⁺ ≤3.5 mEq/L No (0), Admission QTc ≥450 ms No (0), Acute MI No (0), Sepsis No (0), Heart failure No (0)… → Result: Tisdale 3 /21（Drug points: 3, Cue: ≤6 — low risk of QTc >500 ms） Inputs: Age ≥68 years No (0), Female sex No (0), Loop diuretic No (0), Serum K⁺ ≤3.5 mEq/L No (0), Admission QTc ≥450 ms No (0), Acute MI No (0), Sepsis No (0), Heart failure No (0)… → Result: Tisdale 0 /21（Drug points: 0, Cue: ≤6 — low risk of QTc >500 ms）