Device-Related Thrombosis After Left Atrial Appendage Occlusion: Updated Management and Contemporary Challenges

Percutaneous left atrial appendage occlusion (LAAO) has become an established alternative to long-term oral anticoagulation for stroke prevention in patients with atrial fibrillation, with expanding indications beyond those with absolute contraindications to anticoagulation. Alongside its broader adoption, device-related thrombus (DRT) has emerged as a clinically relevant complication that directly compromises the protective intent of LAAO. This comprehensive narrative review synthesizes contemporary evidence on the incidence, mechanisms, predictors, clinical impact, and management of DRT. DRT is a multifactorial phenomenon that carries an annual incidence ranging from 1.75% to almost 5%, resulting from the interplay between post-implant flow dynamics, device engineering, endothelialization processes, procedural factors, and patient-specific prothrombotic features. Accumulating data from observational registries links DRT to increased risks of ischemic stroke, systemic embolism, major adverse cardiovascular events (MACE), and mortality. Although evidence is growing, optimal management regimens for both the prevention and treatment of DRT remain undefined. Moreover, a lack of standardization also affects diagnosis and imaging surveillance, mainly performed by transesophageal echocardiography or cardiac computed tomography. By integrating mechanistic insights, clinical predictors, device-specific considerations, and therapeutic evidence, this review highlights current knowledge gaps and proposes practical considerations to inform individualized risk stratification, surveillance, and management of DRT in contemporary LAAO practice.