DAPT Score
Calculate the DAPT score to guide dual antiplatelet therapy duration after drug-eluting stent placement. Assess 8 clinical criteria for optimal DAPT duration decision.
About This Calculator
The DAPT (Dual Antiplatelet Therapy) Score Calculator is a clinical decision tool that helps cardiologists and healthcare providers determine the optimal duration of dual antiplatelet therapy after drug-eluting stent (DES) placement. Based on the landmark DAPT Study published in the New England Journal of Medicine, this scoring system weighs the ischemic benefit of prolonged DAPT against the associated bleeding risk.
The calculator evaluates 8 clinical criteria — age, smoking status, diabetes, presentation with myocardial infarction, prior PCI or MI history, heart failure or reduced ejection fraction, stent diameter, and stent type — to generate a score ranging from -2 to 10. A score of 2 or higher suggests that continuing DAPT beyond 12 months provides significant ischemic protection, while a score below 2 indicates that standard 12-month DAPT is sufficient.
Formula
DAPT Score = Age Points + Smoking (0 or 1) + Diabetes (0 or 1) + MI at Presentation (0 or 1) + Prior PCI or Prior MI (0 or 1) + CHF or LVEF <30% (0 or 2) + Stent Diameter <3mm (0 or 1) + Paclitaxel-Eluting Stent (0 or 1)
Where Age Points are: <65 years = 0, 65–74 years = -1, ≥75 years = -2.
Regional Notes
United States: The ACC/AHA guidelines recommend considering the DAPT score (Class IIb) for guiding DAPT duration decisions after DES placement. The FDA-approved DAPT indications generally recommend 6-12 months of therapy with the score used for extended duration decisions.
India: The Cardiological Society of India (CSI) endorses the DAPT score for clinical decision-making. Indian patients often present with higher rates of diabetes and premature CAD, which may influence the risk-benefit calculation. Typical DAPT duration in India follows ACC/AHA and ESC guidelines.
United Kingdom: NICE guidelines recommend DAPT for 6-12 months after DES, with the DAPT score considered for extended duration decisions. The National Health Service (NHS) advocates for individualized assessment using validated scoring tools alongside clinical judgment.
Disclaimer: This calculator provides reference information only. Always consult a healthcare professional for medical decisions regarding antiplatelet therapy.
Frequently Asked Questions
What is the DAPT score?
The DAPT (Dual Antiplatelet Therapy) score is a clinical tool derived from the DAPT Study to help determine the optimal duration of dual antiplatelet therapy after drug-eluting stent (DES) placement. It balances ischemic benefit against bleeding risk to decide between 12 months versus 30+ months of DAPT.
How is the DAPT score calculated?
The DAPT score is calculated using 8 clinical criteria: age (≥75 = -2, 65-74 = -1, <65 = 0), cigarette smoking within past year (+1), diabetes mellitus (+1), MI at presentation (+1), prior PCI or prior MI (+1), CHF or LVEF <30% (+2), stent diameter <3mm (+1), and paclitaxel-eluting stent (+1). Total score ranges from -2 to 10.
What does a DAPT score of 2 or higher mean?
A DAPT score of 2 or higher indicates that the ischemic benefit of continuing dual antiplatelet therapy beyond 12 months likely outweighs the bleeding risk. The DAPT Study showed patients with scores ≥2 had significant reduction in ischemic events (stent thrombosis, MI, stroke) with continued therapy.
What does a DAPT score below 2 mean?
A DAPT score below 2 suggests that the bleeding risk of continuing DAPT beyond 12 months may outweigh the ischemic benefit. In the DAPT Study, patients with scores <2 did not show significant ischemic benefit from prolonged therapy and had higher bleeding rates.
What are the components of the DAPT score?
The DAPT score has 8 components: age (categorized as <65, 65-74, or ≥75), current cigarette smoking, diabetes mellitus, myocardial infarction at presentation, prior PCI or prior MI, congestive heart failure or LVEF <30%, stent diameter <3mm, and treatment with a paclitaxel-eluting stent.
Is the DAPT score used in clinical practice worldwide?
Yes, the DAPT score is recommended by major cardiology societies including the American College of Cardiology (ACC), American Heart Association (AHA), European Society of Cardiology (ESC), and the Cardiological Society of India (CSI). It is a Class IIb recommendation for guiding DAPT duration after DES implantation.
What are the limitations of the DAPT score?
The DAPT score was derived from a clinical trial population and may not apply to all real-world patients. It does not account for factors like concurrent anticoagulation, renal impairment, bleeding history, or specific procedural characteristics. Clinical judgment and individual patient assessment should always guide final treatment decisions.
How accurate is this calculator?
This calculator uses the standard DAPT scoring algorithm from the published DAPT Study (Mauri et al., NEJM 2014). The scoring system has been validated in multiple cohorts. Results should be verified by a healthcare professional and used alongside clinical judgment for treatment decisions.