TIMI UA/NSTEMI calculator

The TIMI risk score for unstable angina and non-ST-elevation myocardial infarction is a seven-item bedside rule derived from the TIMI 11B and ESSENCE trials. Each published criterion is a yes-or-no finding worth one point: age of sixty-five years or more, at least three coronary-artery-disease risk factors, known coronary stenosis of fifty percent or more, aspirin use in the past seven days, two or more anginal episodes in twenty-four hours, ST-segment deviation of at least half a millimetre, and elevated cardiac markers such as troponin or CK-MB. Adding the seven bits produces an integer from zero through seven. Teaching bands map zero through two to low risk, three and four to intermediate risk, and five through seven to high risk of a fourteen-day composite of death, new or recurrent myocardial infarction, or severe recurrent ischemia requiring urgent revascularization. This capability implements that published UA/NSTEMI rule as a pure function: you send seven booleans and receive the score together with the risk category. Missing answers are rejected with invalid input rather than being treated as no.

How the TIMI UA/NSTEMI score is defined

The TIMI risk score for unstable angina and NSTEMI is the seven-item prediction rule published by Antman and colleagues from the TIMI 11B and ESSENCE datasets. The published rule is deliberately small: seven binary findings, each worth one point, with no weighting and no GRACE or HEART items mixed in. Age contributes one point when the person is sixty-five years or older.

Coronary-artery-disease risk factors contribute one point when at least three of the classic factors are present: family history of coronary disease, hypertension, hypercholesterolemia, diabetes, and current smoking. Known coronary disease contributes one point when stenosis of fifty percent or more has already been documented. Aspirin contributes one point when the person used aspirin in the past seven days.

Severe angina contributes one point when two or more anginal episodes occurred in the past twenty-four hours. ST-segment deviation contributes one point when the tracing shows deviation of at least half a millimetre. Elevated cardiac markers contribute one point when troponin or CK-MB is above the local cutoff.

Adding the seven bits produces an integer from zero through seven. Teaching maps zero through two to low risk, three and four to intermediate risk, and five through seven to high risk of the fourteen-day composite of all-cause death, new or recurrent myocardial infarction, or severe recurrent ischemia requiring urgent revascularization.

Published event rates from the derivation work are about four point seven percent at scores zero and one, eight point three percent at two, thirteen point two percent at three, nineteen point nine percent at four, twenty-six point two percent at five, and forty point nine percent at six or seven. This capability implements those seven flags and those three bands exactly.

It does not compute age from a birth date, does not count risk factors from a longer history form, and does not ingest a GRACE, HEART, or STEMI TIMI score. Inputs must be present. A missing answer cannot be assumed as no and fails with invalid input rather than silently under-scoring.

Always frame outputs as educational scores from the published UA/NSTEMI TIMI rule, not as a clinical diagnosis or a substitute for a clinician, angiography, or local chest-pain protocols.

Where TIMI UA/NSTEMI calculators show up in real work

Cardiology education, emergency-medicine orientation, and physician-assistant courses constantly assign TIMI UA/NSTEMI drills from textbook yes-no vignettes, so a single trusted oracle that returns the integer beside the risk band speeds grading and demo setup. Chest-pain pathway worksheets want a documented seven-flag path that clients can audit by hand rather than a black-box ACS model that mixes GRACE, HEART, and STEMI TIMI without disclosure.

Research assistants preparing synthetic emergency-department datasets need stable TIMI labels from known answers without network calls or model drift, and they need a hard reject when any of the seven answers is missing so dirty extracts cannot masquerade as scores. If you later need the TIMI STEMI score, a GRACE ACS score, a HEART score, or numeric age and marker values rather than decided flags, treat those as separate search intents and landings rather than overloading this UA/NSTEMI TIMI calculator page.

Always present results as educational estimates from the published seven-point rule; clinical decisions require qualified professionals, a full history this tool does not collect, and protocols that may refer for an early invasive strategy when the score is intermediate or high. Keep requests small, pin the integer score and the risk band in tests, and you get reproducible TIMI UA/NSTEMI figures for homework, LMS plugins, and edge workers without standing up a clinical information system of your own.