Calculate the TIMI Risk Score for STEMI to estimate 30-day all-cause mortality risk in ST-elevation myocardial infarction patients. Enter clinical variables including age, systolic blood pressure, heart rate, weight, Killip class, and key findings like anterior ST elevation or LBBB and time to treatment. Your result shows the total TIMI score and corresponding mortality risk percentage at 30 days.
TIMI Score
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30-Day Mortality Risk
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Risk Category
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The TIMI (Thrombolysis in Myocardial Infarction) Risk Score for STEMI is a validated clinical scoring tool that estimates the risk of all-cause mortality within 30 days of a ST-elevation myocardial infarction. It was derived from the InTIME II trial and uses 9 simple bedside variables to stratify patients into risk categories.
Higher TIMI scores correspond to higher 30-day mortality risk. A score of 0 carries approximately 0.8% mortality risk, while a score of ≥8 carries approximately 26.8–35.9% mortality risk. Scores of 0–3 are generally considered low risk, 4–6 intermediate risk, and ≥7 high risk.
The score sums points from 9 criteria: age 65–74 years (+2), age ≥75 years (+3), diabetes/hypertension/angina (+1), systolic BP <100 mmHg (+3), heart rate >100 bpm (+2), Killip class II–IV (+2), weight <67 kg (+1), anterior ST elevation or LBBB (+1), and time to treatment >4 hours (+1). The maximum score is 14.
Killip classification describes the severity of heart failure in the setting of acute MI. Class I is no signs of heart failure; Class II includes mild heart failure signs such as jugular venous distension (JVD) or basilar crackles; Class III is pulmonary edema; Class IV is cardiogenic shock. Classes II–IV indicate significantly elevated mortality risk and contribute +2 points to the TIMI score.
Anterior ST elevation or left bundle branch block (LBBB) on ECG typically indicates a larger area of myocardium at risk, often due to left anterior descending artery occlusion. These patients tend to have more extensive myocardial damage and worse outcomes, hence the +1 point in the TIMI scoring system.
No, these are two distinct scoring systems. The TIMI Score for STEMI estimates 30-day all-cause mortality specifically in ST-elevation MI patients. The TIMI Score for UA/NSTEMI estimates risk of ischemic events (death, MI, urgent revascularization) at 14 days in unstable angina or non-ST-elevation MI. They use different variables and should not be used interchangeably.
This calculator is intended for use by healthcare professionals (physicians, nurses, paramedics, and medical students) in clinical or educational settings. It should be used as one tool among many in the overall clinical assessment of a STEMI patient and should not replace clinical judgment or institutional protocols.
The maximum possible TIMI STEMI score is 14 points (3 + 1 + 3 + 2 + 2 + 1 + 1 + 1). However, in practice, scores above 8 are rare and are all associated with approximately 35.9% 30-day mortality risk based on the original trial data.