Evaluating the novel parameters for assessing the LAA function and thrombus formation with nonvalvular atrial...

Area of Science:

• Cardiology
• Medical Imaging
• Echocardiography

Background:

• Left atrial appendage (LAA) dysfunction is a significant risk factor for thrombus formation, particularly in patients with persistent atrial fibrillation (AF).
• Traditional 2D-transesophageal echocardiography (TEE) has limitations in accurately assessing LAA function.
• Identifying patients at high risk for LAA thrombosis is crucial for effective clinical management and prognosis.

Purpose of the Study:

• To investigate the association between LAA functional parameters and thrombus formation in patients with non-valvular atrial fibrillation (NVAF).
• To evaluate the utility of real-time three-dimensional transesophageal echocardiography (RT-3D-TEE) in assessing LAA function and predicting thrombosis.
• To identify independent predictors of LAA thrombosis using echocardiographic parameters.

Main Methods:

• A cohort of 102 NVAF patients underwent RT-3D-TEE.
• Patients were categorized into a thrombus group (n=67) and a non-thrombus group (n=35) based on the presence of LAA thrombus (LAAT) or severe spontaneous echocardiographic contrast (SSEC).
• LAA functional parameters were measured using QLAB software, and statistical analyses, including univariate and logistic regression, were performed.

Main Results:

• LAA functional parameters, including LAA ejection fraction (LAAEF) and LAA inflow velocity (LAAVI), were significantly associated with LAAT/SSEC formation.
• Univariate analysis showed positive associations with AF duration, left atrial diameter (LAD), left ventricular ejection fraction (LVEF), LAA outflow tract area (LAA-OAmax), LAA maximum flow velocity (LAAVmax), LAAVI, and LAAEF.
• Logistic regression identified AF duration (OR:1.73), LAAEF (OR:4.09), and LAAVI (OR:3.28) as independent predictors of LAAT/SSEC.

Conclusions:

• Echocardiographic parameters of LAA function, assessed by RT-3D-TEE, are significantly associated with the incidence of LAAT/SSEC in NVAF patients.
• LAAEF and LAAVI are independent predictors of LAA thrombosis in NVAF.
• RT-3D-TEE provides valuable insights into LAA function, aiding in risk stratification and guiding treatment decisions for NVAF patients at risk of thromboembolism.