Cardiac and Perioperative Risk Scores
Published October 11, 2026 · Last updated October 11, 2026
Which risk score answers which question: CHA₂DS₂-VASc and HAS-BLED balance stroke against bleeding in atrial fibrillation, GRACE and TIMI prognosticate acute coronary syndromes, HEART stratifies emergency chest pain, RCRI estimates perioperative cardiac risk, and DAPT weighs antiplatelet duration.
Cardiac risk scores are population-derived prediction tools, and each is calibrated to a specific population and a specific time horizon. Using a score outside the setting it was derived for is a common and avoidable error.
This guide groups the seven cardiac and perioperative risk calculators in the library by the question each one answers, so the right score can be matched to the clinical setting.
Atrial fibrillation: balance stroke risk against bleeding risk
In non-valvular atrial fibrillation, the CHA₂DS₂-VASc score estimates annual ischemic stroke risk and is used to inform oral anticoagulation decisions. The HAS-BLED score estimates the 1-year risk of major bleeding in patients receiving anticoagulation and is used to surface modifiable bleeding risk factors.
The two scores are complementary: the stroke-risk score argues for anticoagulation, and the bleeding-risk score identifies factors that can be mitigated — it is intended to prompt correction of reversible bleeding risks rather than to veto treatment.
Acute coronary syndromes: in-hospital and 14-day risk
The GRACE score was developed from a large registry of acute coronary syndromes to estimate in-hospital mortality across the ACS spectrum, including STEMI, NSTEMI, and unstable angina. The TIMI risk score for UA/NSTEMI estimates the 14-day risk of all-cause mortality, new or recurrent myocardial infarction, or severe recurrent ischemia requiring urgent revascularization.
Both are prognostic scores for an already-diagnosed ACS; they differ in time horizon and in the inputs they use, so the one you choose depends on the endpoint you want to estimate.
Emergency chest pain: the HEART score
For undifferentiated chest pain in the emergency department — before the diagnosis is certain — the HEART score stratifies patients by their 6-week risk of a major adverse cardiac event. It is a different tool for a different moment than GRACE or TIMI: those assume an ACS diagnosis, while HEART is applied to the larger population of chest-pain presentations in which most patients do not have an ACS.
Perioperative risk: the Revised Cardiac Risk Index
The RCRI estimates the 30-day risk of major cardiac complications — myocardial infarction, pulmonary edema, ventricular fibrillation or primary cardiac arrest, and complete heart block — in patients undergoing major noncardiac surgery. It is the score most commonly used for preoperative risk stratification and is deliberately simple, built from a small set of clinical predictors.
Antiplatelet duration: the DAPT score
After coronary stenting, the DAPT score weighs the expected benefit of continuing dual antiplatelet therapy beyond 12 months against the expected risk of bleeding, helping clinicians decide whether the prolonged course is likely to have net benefit. It was developed specifically for the decision of extending DAPT after the first year.
Match the score to the question
A score is only meaningful when its population, outcome, and time horizon match the question being asked. Atrial fibrillation, a suspected ACS, undifferentiated chest pain, upcoming noncardiac surgery, and the decision about antiplatelet duration are five different questions, and each has its own calibrated tool in the library.
Calculators in this guide
Related guides
References
- Lip GYH, et al. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the Euro Heart Survey on atrial fibrillation. Chest. 2010;137(2):263-272.
- January CT, et al. 2019 AHA/ACC/HRS Focused Update of the 2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation. Circulation. 2019;140(2):e125-e151.
- Pisters R, et al. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation: the Euro Heart Survey. Chest. 2010;138(5):1093-1100.
- Lee TH, et al. Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery. Circulation. 1999;100(10):1043-1049.
- Granger CB, et al. Predictors of hospital mortality in the global registry of acute coronary events. Arch Intern Med. 2003;163(19):2345-2353.
- Antman EM, et al. The TIMI risk score for unstable angina/non-ST elevation MI: A method for prognostication and therapeutic decision making. JAMA. 2000;284(7):835-842.
- Six AJ, et al. Chest pain in the emergency room: value of the HEART score. Neth Heart J. 2008;16(6):191-196.
- Yeh RW, et al. Development and validation of a prediction rule for benefit and harm of dual antiplatelet therapy beyond 1 year after percutaneous coronary intervention. JAMA. 2016;315(16):1735-1749.