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 ClearSightTM-derived cardiac index (CICS) with that measured using three-dimensional echocardiography (CI3D).


METHODS
The study included 20 patients who underwent elective AAA surgery. CICS and CI3D were measured simultaneously at eight time points during the surgery. Trending ability was investigated after aortic clamping and unclamping. We used CI3D as the reference method.


RESULTS
Bland-Altman analysis showed a wide limit of agreement between CICS and CI3D (percentage error 41.3%). Subgroup analysis showed a lower percentage error (33.2%) in patients with CI ≥ 2.5 L/min/m2. The cubic splines related to the CI3D and CI discrepancy were negatively sloped, indicating that CI3D had significant influence on the CI discrepancy (p < 0.001). Four-quadrant plot analysis showed that the tracking ability of ClearSight™ after aortic clamping and declamping were clinically unacceptable (81.3% and 78.6%, respectively). Also, the polar plot analysis showed that the concordance rate of ClearSight™ after aortic clamping and declamping were clinically unacceptable (58.3% and 66.7%, respectively).


CONCLUSIONS
ClearSight™ was not sufficiently accurate in patients undergoing AAA surgery. The tracking ability of ClearSight™ after aortic clamping was below the acceptable limit.
['Sumiyoshi|Miho|M|', 'Maeda|Takuma|T|0000-0002-8166-3839', 'Miyazaki|Erika|E|', 'Hotta|Naoshi|N|', 'Sato|Hitoshi|H|', 'Hamaguchi|Eisuke|E|', 'Kanazawa|Hiroko|H|', 'Ohnishi|Yoshihiko|Y|', 'Kamei|Masataka|M|']
D000368:Aged D017544:Aortic Aneurysm, Abdominal D002302:Cardiac Output D019560:Echocardiography, Three-Dimensional D005260:Female D006339:Heart Rate D000074743:Hemodynamic Monitoring D006801:Humans D008297:Male D008875:Middle Aged D011446:Prospective Studies
ClearSight Cardiac output Echocardiography Blood pressure monitor Ultrasound