dapt_score: Dual Antiplatelet Therapy (DAPT) Score

In cliot: Clinical Indices and Outcomes Tools

Dual Antiplatelet Therapy (DAPT) Score

Description

Calculates the DAPT Score to guide the duration of dual antiplatelet therapy (DAPT) after coronary stent implantation. The score balances the risks of ischemia (stent thrombosis, MI) against the risks of bleeding to determine if prolonged therapy (>12 months) is beneficial.

Usage

dapt_score(age, smoker, diabetes, mi_presentation, prior_pci_mi,
           paclitaxel_stent, stent_diameter_lt_3mm, chf_lvef_lt_30,
           vein_graft_stent)

Arguments

age	Numeric. Patient age in years. >= 75: -2 pts. 65-74: -1 pt. < 65: 0 pts.
smoker	Numeric (0 or 1). Current cigarette smoker. (1 = Yes, +1 pt).
diabetes	Numeric (0 or 1). Diabetes mellitus. (1 = Yes, +1 pt).
mi_presentation	Numeric (0 or 1). MI at presentation. (1 = Yes, +1 pt).
prior_pci_mi	Numeric (0 or 1). Prior PCI or prior MI. (1 = Yes, +1 pt).
paclitaxel_stent	Numeric (0 or 1). Paclitaxel-eluting stent used. (1 = Yes, +1 pt).
stent_diameter_lt_3mm	Numeric (0 or 1). Stent diameter < 3 mm. (1 = Yes, +1 pt).
chf_lvef_lt_30	Numeric (0 or 1). Congestive heart failure or LVEF < 30%. (1 = Yes, +2 pts).
vein_graft_stent	Numeric (0 or 1). Vein graft stent. (1 = Yes, +2 pts).

Value

A list containing:

DAPT_Score	The calculated score (Range -2 to 10).
Risk_Profile	"Low Score" (<2) or "High Score" (>=2).
Recommendation	Clinical guidance regarding DAPT duration (Standard vs. Prolonged).

References

Yeh RW, Secemsky EA, Kereiakes DJ, 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. doi:10.1001/jama.2016.3775

Examples

# Example 1: Prolonged DAPT Candidate
# 55yo (0), Smoker (+1), MI at presentation (+1), Diabetes (+1)
# Score = 3
dapt_score(55, 1, 1, 1, 0, 0, 0, 0, 0)

# Example 2: Standard DAPT Candidate
# 70yo (-1), Prior MI (+1), No other factors
# Score = 0
dapt_score(70, 0, 0, 0, 1, 0, 0, 0, 0)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.