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Short-term dual antiplatelet therapy after interventional left atrial appendage closure with different devices.

AIMS
We aimed to assess the feasibility, efficacy and safety of short-term dual antiplatelet therapy (DAPT) for six weeks after left atrial appendage closure (LAAC).


METHODS AND RESULTS
Data of the Cardioangiologisches Centrum Bethanien-LAAC registry were analysed. DAPT (aspirin 100 mg plus clopidogrel 75 mg) was administered until transoesophageal echocardiography (TEE) evaluation six weeks after LAAC. In the absence of significant peri-device flow or device-related thrombus (DRT), the medication was decreased to single antiplatelet therapy (SAPT). Outpatient visits were timed at six-month intervals. The incidences of major bleeding (BARC ≥3) and of thromboembolic events were investigated. A total of 298 patients (76±8 years; 62% male; CHA2DS2-VASc 4.3±1.5; HAS-BLED 3.5±1.0; 61% with history of bleeding) with successful LAAC were included. TEE revealed DRT in 7/298 (2.3%) patients (five at six-week follow-up [FU] 45±10 days after implant, two during a median long-term FU of 731 days). Non-procedure-related bleeding events occurred in 25/298 (8.4%) patients and non-procedure-related thromboembolic events in 11/298 (3.7%) patients. This translated into 3.9 bleeding events/100 patient-years and 1.7 thromboembolic events/100 patient-years, respectively. Procedure-related events consisted of major bleeding in 7/298 (2.3%) patients and stroke in 2/298 (0.7%) patients. Age ≥75 years (OR 3.2; CI: 1.2-8.0; p=0.015) and renal impairment (OR 2.5; CI: 1.1-5.7; p=0.027) were identified as independent predictors for major bleeding after LAAC.


CONCLUSIONS
Short-term DAPT for six weeks appears to be a viable alternative for patients after LAAC. Age ≥75 years and renal impairment increase major bleeding events threefold.