Accuracy of the ClearSight™ system in patients undergoing abdominal aortic aneurysm surgery

Purpose The ClearSight™ device monitors continuous pressure and cardiac output via pulse contour analysis. ClearSight™, however, may not be reliable in patients with reduced peripheral perfusion caused by high peripheral resistance. This study aimed to elucidate the accuracy and trending ability of ClearSight™ in patients undergoing abdominal aortic aneurysm (AAA) surgery by comparing the ClearSight TM -derived cardiac index (CI CS ) with that measured using three-dimensional echocardiography (CI 3D ). Methods The study included 20 patients who underwent elective AAA surgery. CI CS and CI 3D were measured simultaneously at eight time points during the surgery. Trending ability was investigated after aortic clamping and unclamping. We used CI 3D as the reference method. Results Bland–Altman analysis showed a wide limit of agreement between CI CS and CI 3D (percentage error 41.3%). Subgroup analysis showed a lower percentage error (33.2%) in patients with CI ≥ 2.5 L/min/m 2 . The cubic splines related to the CI 3D and CI discrepancy were negatively sloped, indicating that CI 3D had significant influence on the CI discrepancy ( p