DAPT Calculator

The DAPT score is a clinical decision aid developed for people who have completed about 12 months of dual antiplatelet therapy after percutaneous coronary intervention without a major ischemic or bleeding event. It estimates whether continuing treatment beyond one year may prevent more myocardial infarctions or stent thromboses than the additional bleeding it may cause. The score does not decide treatment by itself; it structures a discussion between a patient and the cardiology team. Age contributes negative points because bleeding risk rises with age: age 65 to 74 subtracts one point and age 75 or older subtracts two. Current smoking, diabetes, myocardial infarction at presentation, a previous myocardial infarction or PCI, stent diameter below 3 mm, and use of a paclitaxel-eluting stent each add one point. Heart failure or left ventricular ejection fraction below 30 percent and intervention on a saphenous vein graft each add two points. A score of two or more identifies the group in the original validation data that was more likely to receive net benefit from prolonged therapy. A score below two suggests that bleeding harm may be greater than ischemic benefit. This assessment is intended only after an event-free first year of treatment. It is not designed for selecting the initial antiplatelet regimen, diagnosing coronary disease, or overriding a current prescription. Medication choice and duration also depend on active bleeding, planned surgery, anticoagulant use, kidney or liver disease, frailty, adherence, stent history, and the reason for PCI. Those considerations may change a recommendation even when the numeric score appears clear. Never stop aspirin or a prescribed P2Y12 inhibitor because of an online result. Sudden interruption can cause serious stent thrombosis, while unnecessary continuation can cause major bleeding. Confirm every input with the medical record and review the result with a clinician who knows the procedure and current health status. Seek urgent care for chest pain, black stools, vomiting blood, severe unexplained bruising, fainting, or stroke symptoms.