Noninvasive cardiac output measurements are inaccurate in patients with severe aortic valve stenosis undergoing transcatheter aortic valve implantation.

Background: Noninvasive cardiac output (CO) measured using ClearSight™ eliminates the need for intra-arterial catheter insertion. The purpose of this study was to examine the accuracy of non-invasive CO measurement in patients with severe aortic valve stenosis (AS).

Methods: Twenty-eight patients undergoing elective transcatheter aortic valve implantation were prospectively enrolled in this study.