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DAPT Duration

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Clinical TrialSeptember 15, 2017, Volume 243, Pages 132–139

JOURNAL：Int J Cardiol. Article Link

Patterns and associations between DAPT cessation and 2-year clinical outcomes in left main/proximal LAD versus other PCI: Results from the Patterns of Non-Adherence to Dual Antiplatelet Therapy in Stented Patients (PARIS)

Chandrasekhar J, Baber U, Mehran R et al. Keywords: LM/pLAD PCI; DAPT cessation; MACE

ABSTRACT

OBJECTIVES - Percutaneous coronary intervention (PCI) of the left main (LM) or proximal left anterior descending artery (pLAD) is considered high-risk as these segments subtend substantial left ventricular myocardial area. We assessed the patterns and associations between dual antiplatelet therapy (DAPT) cessation and 2-year outcomes in LM/pLAD vs. other PCI from the all-comer PARIS registry.


METHODS - Two-year major adverse cardiovascular events (MACE) were a composite of cardiac death, myocardial infarction, definite/probable stent thrombosis or target lesion revascularization. DAPT cessation was predefined as physician-guided permanent discontinuation, temporary interruption, or non-recommended disruption due to non-compliance or bleeding.


RESULTS - Of the study population (n=5018), 25.0% (n=1252) underwent LM/pLAD PCI and 75.0% (n=3766) PCI to other segments. Compared to others, LM/pLAD patients presented with fewer comorbidities, less frequent acute coronary syndromes but more multivessel and bifurcation disease treated with greater stent lengths. Two-year adjusted risk of MACE (11.4% vs. 11.6%; HR 1.10, 95% CI 0.90-1.34, p=0.36) was similar between LM/pLAD vs. other patients. DAPT discontinuation was significantly higher (43.3% vs. 39.4%, p=0.01) in LM/pLAD patients with borderline significance for lower disruption (10.0% vs. 14.7%, p=0.059) compared to other patients. DAPT discontinuation was not associated with higher risk of MACE in LM/pLAD (HR 0.65, 95% CI 0.34-1.25) or other PCI groups (HR 0.67, 95% CI 0.47-0.95).


CONCLUSIONS - LM/pLAD PCI was not an independent predictor of 2-year MACE. Compared to other PCI, patients undergoing LM/pLAD PCI had higher rates of physician recommended DAPT discontinuation, however, discontinuation did not result in greater adverse events.

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