maratoolTIMI Risk Score for STEMI Calculator
TIMI risk score for 30-day mortality in ST-elevation myocardial infarction (0–14).
References
- Morrow DA, Antman EM, Charlesworth A, et al. TIMI risk score for ST-elevation myocardial infarction. Circulation. 2000;102(17):2031-2037.
What is TIMI Risk Score for STEMI?
The TIMI risk score for ST-elevation myocardial infarction (STEMI) predicts 30-day all-cause mortality in patients receiving fibrinolytic therapy for acute STEMI. Derived by Morrow et al. in 2000 from the InTIME-II trial, it assigns weighted points to eight admission variables: age (≥75 = 3, 65–74 = 2), diabetes/hypertension/angina history (1), systolic BP <100 (3), heart rate >100 (2), Killip class II–IV (2), weight <67 kg (1), anterior STEMI or LBBB (1), and time to treatment >4 hours (1). The total (0–14) corresponds to 30-day mortality ranging from ~0.8% at score 0 to over 35% at scores ≥8.
How to use
- Select each clinical variable for your STEMI patient.
- The weighted total score (0–14) and 30-day mortality estimate update instantly.
- Use for prognosis and triage intensity, alongside reperfusion strategy.
Frequently asked questions
What is the TIMI score for STEMI?
A weighted score (0–14) that predicts 30-day mortality in ST-elevation myocardial infarction treated with fibrinolysis.
How does it differ from the UA/NSTEMI TIMI score?
The STEMI version uses weighted points (e.g., SBP < 100 = 3 points) and predicts mortality; the UA/NSTEMI version is a 7-point equal-weight score predicting a composite ischemic outcome.
What is Killip class?
A bedside classification of heart failure in acute MI: I = none, II = rales/S3, III = pulmonary edema, IV = cardiogenic shock.
Was this score validated for primary PCI?
It was derived in fibrinolysis-treated patients (InTIME-II); it still risk-stratifies PCI-treated STEMI but absolute mortality estimates differ with modern reperfusion.
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