The Value of Cardiac 3-Dimensional Computed Tomography in the Simplified Left Atrial Appendage Occlusion

Background Simplified left atrial appendage occlusion (LAAO) is one of the important treatment methods for preventing thromboembolism in patients with nonvalvular atrial fibrillation. Currently, there are few studies on the value of cardiac 3-dimensional computed tomography (3D-CT) in the simplified LAAO. Objective To investigate the feasibility, safety, surgical efficacy and postoperative follow-up value of 3D-CT in simplified LAAO. Methods We prospectively recruited 52 patients who underwent simplified LAAO in the Second Affiliated Hospital of Anhui Medical University from May 2021 to January 2024. They were randomly assigned into the control group and study group by lottery. Preoperative transesophageal echocardiography (TEE) and preoperative cardiac 3D-CT were performed in the control group and study group, respectively. The baseline data, maximum ostium diameter and maximum depth of the left atrial appendage (LAA), match rate between the delivered sheath and the axis of LAA, operation time, time for x-ray exposure and dose, consumption of contrast agent, the rate of non-recapture and non-change of occlusion device, peri-device leakage (PDL), and perioperative complications were collected. A 3D-CT follow-up was performed for 90 days after LAAO. Results Both the control group and the study group comprised 26 cases each, using the WATCHMAN device for LAAO, with no serious perioperative complications. Preoperative examinations showed no intracardiac thrombus in all patients. In the control group, the maximum ostium diameter of the LAA measured by preoperative TEE and intraoperative DSA was (22.9±4.1) mm and (25.4±2.9) mm, respectively, not showing a positive correlation (r=0.374, P=0.060). The usable depth of the LAA in the control group measured by preoperative TEE and intraoperative DSA was (25.7±8.1) mm and (23.7±3.4) mm, respectively, showing a positive correlation (r=0.392, P=0.048). In the study group, the maximum ostium diameter of the LAA measured by preoperative 3D-CT and intraoperative DSA was (25.0±3.3) mm and (24.9±5.8) mm, respectively, showing a positive correlation (r=0.566, P=0.003). The usable depth of the LAA in the study group measured by preoperative 3D-CT and intraoperative DSA was (23.5±4.2) mm and (23.1±4.0) mm, respectively, showing a positive correlation (r=0.774, P