Long-Term Bleeding Risk Prediction with Dual Antiplatelet Therapy After Acute Coronary Syndromes Treated Without Revascularization

The PRECISE-DAPT score and 5-year outcomes after percutaneous coronary intervention: a large-scale, real-world study from China

AIMS

The PRECISE-DAPT (predicting bleeding complications in patients undergoing stent implantation and subsequent dual-antiplatelet therapy) score is recommended by guidelines for predicting out-of-hospital bleeding in patients after percutaneous coronary intervention (PCI). However, the long-term prognostic value of the PRECISE-DAPT score in patients after PCI remains unclear.

METHODS AND RESULTS

We performed a prospective study of 10 724 patients who underwent PCI throughout 2013 in Fuwai Hospital. The bleeding endpoint was Bleeding Academic Research Consortium 2, 3, or 5 bleeding. The ischaemic endpoints were all-cause death and major adverse cardiovascular and cerebrovascular events (MACCE). After a 5-year follow-up, 10 109 patients were finally analysed. A total of 415 (4.11%) patients experienced bleeding, 364 (3.60%) experienced all-cause death, and 2049 (20.27%) had MACCE. Using Cox regression, the risks of bleeding [hazard ratio (HR): 1.721, 95% confidence interval (CI): 1.180-2.511, P = 0.005], MACCE (HR: 1.607, 95% CI: 1.347-1.917, P < 0.001), and all-cause-death (HR: 3.902, 95% CI: 2.916-5.221, P < 0.001) in patients with a high score were significantly higher than those in patients with a low score. The PRECISE-DAPT score showed prognostic value for 5-year events of bleeding (C-statistic: 0.566, 95% CI: 0.537-0.594), MACCE (C-statistic: 0.540, 95% CI: 0.527-0.553), and all-cause death (C-statistic: 0.673, 95% CI: 0.644-0.702).

CONCLUSION

After 5 years of follow-up, the PRECISE-DAPT score has a statistically significant predictive value for long-term bleeding events in the Chinese PCI population, and also some prognostic value for death and MACCE.

ONE-SENTENCE SUMMARY

In this real-world, large-sample study, the PRECISE-DAPT (predicting bleeding complications in patients undergoing stent implantation and subsequent dual-antiplatelet therapy) score shows a statistically significant 5-year predictive value for bleeding in Chinese patients with percutaneous coronary intervention and dual-antiplatelet therapy. The study also shows that the PRECISE-DAPT score has moderate predictive value for all-cause death.

Individualizing Dual Antiplatelet Therapy (DAPT) Duration Based on Bleeding Risk, Ischemic Risk, or Both: An Analysis From the DAPT Study

BACKGROUND

Guidelines recommend individualization of dual antiplatelet therapy (DAPT) duration. Whether to guide decisions based on bleeding risk, ischemic risk or a combination is not known.

AIMS

To compare a bleeding prediction model, an ischemic prediction model, and the DAPT score in guiding DAPT duration.

METHODS

11,648 patients in the DAPT Study were categorized into higher and lower risk using a bleeding model, an ischemic model, and the DAPT score. Effect of 30 vs. 12 months of DAPT on bleeding events, ischemic events, and the combination (net-adverse clinical events [NACE]) was assessed.

RESULTS

Among patients stratified with the bleeding model, 30 vs. 12 months of DAPT resulted in similar ischemic and bleeding event rates. With the ischemic model, however, higher risk patients had a greater reduction in ischemic events with extended duration of DAPT (difference in risk differences [DRD]: -2.6%, 95% CI: -3.9 to -1.3%; p < 0.01), and a smaller increase in bleeding (DRD: -1.0%, 95% CI: -2.1-0.0%; p = 0.04). Similarly, high DAPT score patients had a greater reduction in ischemic events with extended DAPT duration (DRD: -2.4%, 95%: CI: -3.6 to -1.1%; p < 0.01) and a smaller increase in bleeding (DRD: -1.2%, 95%: CI: -2.2-0.0%; p = 0.02). Although NACE was similar for bleeding risk groups, NACE was significantly reduced with extended DAPT in the higher ischemic risk and high DAPT score groups.

CONCLUSIONS

In this low-bleeding risk population, stratifying patients based on predicted ischemic risk and the DAPT score best discerned benefit versus harm of extended DAPT duration on ischemic events, bleeding events, and NACE.

CONDENSED ABSTRACT

Duration of dual antiplatelet therapy (DAPT) should be guided by an individualized risk assessment. Bleeding risk tools have emerged to identify patients at high bleeding risk for whom truncated DAPT therapy may be safest. In a lower bleeding risk population, however, whether DAPT duration should be guided by bleeding risk, ischemic risk, or a combination is unknown. In this analysis, implementation of a score based on ischemic risk prediction and the DAPT score (a combination of ischemic and bleeding risk) best predicted ischemic events, bleeding events, and net-adverse clinical events (NACE).

Antiplatelet Therapy for Atherothrombotic Disease in 2022—From Population to Patient-Centered Approaches

Antiplatelet agents, with aspirin and P2Y₁₂ receptor antagonists as major key molecules, are currently the cornerstone of pharmacological treatment of atherothrombotic events including a variety of cardio- and cerebro-vascular as well as peripheral artery diseases. Over the last decades, significant changes have been made to antiplatelet therapeutic and prophylactic strategies. The shift from a population-based approach to patient-centered precision medicine requires greater awareness of individual risks and benefits associated with the different antiplatelet strategies, so that the right patient gets the right therapy at the right time. In this review, we present the currently available antiplatelet agents, outline different management strategies, particularly in case of bleeding or in perioperative setting, and develop the concept of high on-treatment platelet reactivity and the steps toward person-centered precision medicine aiming to optimize patient care.

Assessment of Risk Factors for Drug Resistance of Dual Anti Platelet Therapy After PCI

Since aspirin and clopidogrel are the widely and conventionally used drugs to treat acute myocardial infarction after percutaneous coronary intervention (PCI), it is important to explore potential risk factors of their resistance. The platelet aggregation rate with arachidonic acid (AA, PAg-AA%) and adenosine diphosphate (ADP, PAg-ADP%) of 219 PCI patients were measured after standard treatment for 24 h. The disease history and laboratory data (before PCI) were obtained. We found 101 (46.12%) patients to be aspirin-resistant, and PAg-ADP% was the most prominent risk factor of aspirin resistance. Clopidogrel resistance was present in 157 of 219 patients. Patients in the clopidogrel-resistant group carried more CYP2C19*3 or *2, which was associated with higher clopidogrel resistance in this group (69.11%, 47/68) than in the control group (64.29%, 36/56). Platelet count (10⁹/L) and hemoglobin (g/L) were the prominent risk factors of clopidogrel resistance. Among the 219 patients, 98 showed dual antiplatelet drug resistance, for which platelet count (10⁹/L) and monocyte count (g/L) were the risk factors. Aspirin resistance was found to usually accompany clopidogrel resistance.