The xDAPT External Validation Study (xDAPT)

External Validation of an Individualized Patient Centered Machine Learning Model for the Prediction of Ischemic and Bleeding Risk in Patients on Dual Antiplatelet Therapy After Percutaneous Coronary Intervention

Dual antiplatelet therapy (DAPT) is routinely recommended after percutaneous coronary intervention (PCI) with drug-eluting stent (DES) implantation to prevent thrombotic complications. However, DAPT is also associated with an increased risk of bleeding, which may have a similar or even greater impact on prognosis compared to recurrent ischemic events.

To balance these risks, individualized risk stratification at the time of PCI is crucial for determining the optimal DAPT composition and duration, aiming to reduce thrombotic risk while minimizing bleeding complications. For this purpose, an artificial intelligence-based risk stratification tool (xDAPT, Abbott) was introduced and demonstrated strong clinical performance in its development study (ClinicalTrials.gov identifier: NCT06089304).

This analysis aims to evaluate the performance of xDAPT in a real-world cohort of patients who underwent PCI over the past decade at a large urban center (Mount Sinai Hospital, New York).

Study Overview

• Status: Completed
• Conditions: Coronary Artery Disease; Percutaneous Coronary Intervention
• Intervention / Treatment: Device: Percutaneous coronary intervention

Detailed Description

While dual antiplatelet therapy (DAPT) is recommended after percutaneous coronary intervention (PCI) with drug-eluting stent (DES) implantation to prevent thrombotic complications, it is notably associated with an increased risk of bleeding. Recent evidence suggests that bleeding events occurring early after PCI have a prognostic impact comparable to or even greater than that of recurrent ischemic events. Currently, decisions regarding DAPT duration and composition after PCI are guided by several risk scores that classify patients as having a high bleeding and/or high ischemic risk based on predefined clinical or angiographic factors. However, the predictive performance of these scores is suboptimal, primarily due to the limitations of the analytical approaches used in their development, which typically rely on linear models incapable of capturing the complex interplay of multiple clinical variables.

Machine learning (ML) methods offer the potential to address these limitations by leveraging algorithms to analyze large datasets and identify high-dimensional, non-linear relationships among variables. The xDAPT (Abbott), is a recently developed ML-based tool consisting of two separate random forest survival models for predicting ischemic and bleeding risks, respectively (ClinicalTrials.gov identifier: NCT06089304). Each model incorporates 11 clinical variables identified as the most relevant predictors for ischemic and bleeding events. The xDAPT model was developed and internally validated using a pooled dataset of 11 clinical trials on the XIENCE stent, including approximately 19,000 patients who underwent PCI with an everolimus-eluting stent (XIENCE, Abbott) across 21 countries between 2008 and 2020. Within the test cohort of this dataset, both ischemic and bleeding risk models demonstrated good discriminatory ability, achieving a C-index of ≥0.65 for the prediction of their respective outcomes.

However, the generalizability of the xDAPT tool for routine clinical practice remains to be established, as it has not yet been validated in an independent real-world population of patients receiving PCI with various DES types. The present study aims to externally validate the ischemic and bleeding risk models of xDAPT using data from consecutive patients who underwent PCI at a large urban hospital (Mount Sinai, New York, US) between 2012 and 2022. Consistent with the internal validation analysis, the performance goal for the model will be defined as achieving a C-index of ≥0.65 at the lower 97.5% confidence interval of the bootstrap C-index distribution.

• Study Type: Observational
• Enrollment (Actual): 30000

Contacts and Locations

Study Locations

• United States
  • New York
    • New York, New York, United States, 10029
      • Icahn School of Medicine at Mount Sinai

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

Patients with coronary artery disease undergoing percutaneous coronary intervention with drug-eluting stents implantation at Mount Sinai Hospital (New York, NY, US) from January, 2012 to December, 2022. A subgroup of this population has received PCI with the XIENCE everolimus-eluting DES (Abbott).

Description

Inclusion criteria:

• Consecutive patients undergoing PCI with any DES implantation at Mount Sinai Hospital (New York, US) between January, 2012 and December, 2022.
• Age ≥18 years
• Ability to provide informed consent for the procedure and subsequent data collection

Exclusion criteria:

• PCI with bare-metal stents (BMS) or balloon angioplasty only
• Cardiogenic shock or cardiac arrest as indication to PCI
• In-hospital mortality
• No available clinical follow-up
• Missing data from any of the variables included in the risk models

Study Plan

How is the study designed?

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Ischemic cohort; All patients sustaining an ischemic event (i.e., death, myocardial infarction, stroke, or stent thrombosis) after hospital discharge and within 1 year of PCI.	Device: Percutaneous coronary intervention; Percutaneous coronary intervention (PCI) is a catheter-based technique performed under fluoroscopic guidance to treat coronary artery disease and restore blood flow to the myocardium. During PCI, coronary vessel patency is generally achieved with drug-eluting stents (DES), which are metallic scaffolds coated with a polymer that carry and gradually release an antiproliferative drug. In the present study, all participants underwent PCI with implantation of DES, and received a subsequent course of dual antiplatelet therapy (DAPT), as clinically indicated.
Bleeding cohort; All patients sustaining a major bleeding event (i.e., requiring a blood transfusion or a repeat hospitalization) after hospital discharge and within 1 year of PCI.	Device: Percutaneous coronary intervention; Percutaneous coronary intervention (PCI) is a catheter-based technique performed under fluoroscopic guidance to treat coronary artery disease and restore blood flow to the myocardium. During PCI, coronary vessel patency is generally achieved with drug-eluting stents (DES), which are metallic scaffolds coated with a polymer that carry and gradually release an antiproliferative drug. In the present study, all participants underwent PCI with implantation of DES, and received a subsequent course of dual antiplatelet therapy (DAPT), as clinically indicated.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Major Adverse Cardiovascular Events	Composite of all-cause death, myocardial infarction, stroke, or stent thrombosis	12 months after PCI procedure

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Major Bleeding Events	Any bleeding event occurring after hospital discharge and requiring repeat hospitalization and/or blood transfusion	12 months after PCI procedure

Collaborators and Investigators

• Sponsor: Icahn School of Medicine at Mount Sinai
• Investigators: Principal Investigator: Roxana Mehran, Icahn School of Medicine at Mount Sinai

Study record dates

Study Major Dates

• Study Start (Actual): January 1, 2012
• Primary Completion (Actual): December 31, 2022
• Study Completion (Actual): December 1, 2024

Study Registration Dates

• First Submitted: December 12, 2024
• First Submitted That Met QC Criteria: December 12, 2024
• First Posted (Actual): March 25, 2025

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: March 19, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Vascular Diseases; Cardiovascular Diseases; Heart Diseases; Arteriosclerosis; Arterial Occlusive Diseases; Coronary Disease; Myocardial Ischemia; Coronary Artery Disease
• Other Study ID Numbers: STUDY-24-01615

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes