Background
Left atrial appendage closure (LAAC) is increasingly used for stroke prevention in patients with non-valvular atrial fibrillation and contraindications to oral anticoagulation. The potential role of early prothrombotic status assessment in evaluating device-related thrombus (DRT) risk following LAAC remains unclear.
Methods
The study included 147 patients undergoing LAAC with oral anticoagulation contraindication. Coagulation activation markers—prothrombin fragment 1 + 2 and thrombin antithrombin III—were measured at baseline and 7 days postprocedure. Based on the 50th percentile of delta (%) changes, patients were classified into low or high prothrombotic status. Specific delta % thresholds were assessed, which could serve as noninvasive cutoffs to rule out DRT.
Results
A total of 53 patients (36.1%) were classified as having high prothrombotic status. DRT occurred in 9 patients (6.1%), with a significantly higher incidence in the high prothrombotic group (15.1 vs. 1.1%, p < 0.001). Multivariable analysis identified elevated post-LAAC coagulation activation markers as independent predictors of DRT (adjusted odds ratio: 13.84 [1.65-115.89], p = 0.015). Proposed thresholds for prothrombin fragment 1 + 2 (74.11%) and thrombin antithrombin III (120.74%) demonstrated negative predictive values of 98.9%. Using these thresholds, 75.5% of patients were classified as low risk for DRT. No clinical differences were observed at follow-up between the low- and high-risk DRT groups.
Conclusions
Early evaluation of coagulation markers provides valuable insight into DRT risk after LAAC. The proposed thresholds demonstrate a high negative predictive value, effectively identifying patients at low risk for DRT and supporting their use as noninvasive tools to safely rule out DRT. These markers could enable early antithrombotic de-escalation and reduce the need for repeat imaging. Further studies are warranted.
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