The TIMI risk score for STEMI was derived from more than 14,000 patients in the InTIME II trial. It helps triage patients and communicate prognosis at the bedside.
How to use the TIMI Risk Score for STEMI
- Age
- Diabetes, hypertension or angina
- Systolic blood pressure below 100 mmHg
- Heart rate above 100 bpm
- Killip class II–IV
- Weight below 67 kg (148 lb)
- Anterior ST elevation or left bundle branch block
- Time to treatment over 4 hours
Results update as you type, and every field accepts the units shown in its menu.
How it works
Each answer carries the points shown in the published score. The calculator adds them up and maps the total to the published interpretation.
Scoring table
| Item | Answers and points |
|---|---|
| Age | Under 65 = 0; 65–74 = 2; 75 or older = 3 |
| Diabetes, hypertension or angina | No = 0; Yes = 1 |
| Systolic blood pressure below 100 mmHg | No = 0; Yes = 3 |
| Heart rate above 100 bpm | No = 0; Yes = 2 |
| Killip class II–IV | No = 0; Yes = 2 |
| Weight below 67 kg (148 lb) | No = 0; Yes = 1 |
| Anterior ST elevation or left bundle branch block | No = 0; Yes = 1 |
| Time to treatment over 4 hours | No = 0; Yes = 1 |
30-day mortality by score
| Score | Mortality |
|---|---|
| 0 | 0.8% |
| 1 | 1.6% |
| 2 | 2.2% |
| 3 | 4.4% |
| 4 | 7.3% |
| 5 | 12.4% |
| 6 | 16.1% |
| 7 | 23.4% |
| 8 | 26.8% |
| 9 or more | 35.9% |
Inputs explained
| Field | What to enter |
|---|---|
| Age | Choose one: Under 65, 65–74, 75 or older |
| Diabetes, hypertension or angina | Choose one: No, Yes |
| Systolic blood pressure below 100 mmHg | Choose one: No, Yes |
| Heart rate above 100 bpm | Choose one: No, Yes |
| Killip class II–IV | Choose one: No, Yes |
| Weight below 67 kg (148 lb) | Choose one: No, Yes |
| Anterior ST elevation or left bundle branch block | Choose one: No, Yes |
| Time to treatment over 4 hours | Choose one: No, Yes |
What each result means
- TIMI STEMI score = [Age] + [Diabetes, hypertension or angina] + [Systolic blood pressure below 100 mmHg] + [Heart rate above 100 bpm] + [Killip class II–IV] + [Weight below 67 kg (148 lb)] + [Anterior ST elevation or left bundle branch block] + [Time to treatment over 4 hours]
- 30-day mortality = interp(min([TIMI STEMI score], 9), 0, 1, 0.8, 1.6, 2.2, 4.4, 7.3, 12.4, 16.1, 23.4, 26.8, 35.9)
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Score = sum of the points for each item
Worked example
Inputs — Age: Under 65; Diabetes, hypertension or angina: No; Systolic blood pressure below 100 mmHg: No; Heart rate above 100 bpm: No; Killip class II–IV: No; Weight below 67 kg (148 lb): No; Anterior ST elevation or left bundle branch block: Yes; Time to treatment over 4 hours: No.
Results — TIMI STEMI score = 1 / 14; 30-day mortality = 1.6 %.
Key terms
- STEMI
- ST-elevation myocardial infarction.
Frequently asked questions
What is a high TIMI STEMI score?
5 or more corresponds to 12% or higher 30-day mortality.
Does it guide treatment?
All STEMI patients need urgent reperfusion; the score helps with prognosis and level of care.
What is Killip class?
A bedside classification of heart failure after a heart attack.