Abstract
Purpose
Transcardiopulmonary thermodilution (TPTD, SVTD) as well as calibrated (SVPC CAL) and uncalibrated (SVPC UNCAL) arterial pulse contour analysis (PC) are increasingly promoted as less-invasive technologies to measure stroke volume (SV) but their reliability in aortic valve disease was unknown. The objective of this prospective study was to investigate the validity of three less-invasive techniques to assess SV in conditions involving aortic stenosis (AS) and valvuloplasty-induced aortic insufficiency (AI) compared with transesophageal echocardiography.
Methods
In 18 patients undergoing transcatheter aortic valve implantation, SVTD and SVPC CAL were determined using a central pressure signal via the brachial artery and SVPC UNCAL using a peripheral radial signal.
Results
In aortic valve dysfunction TPTD achieved adequate reproducibility (concordance correlation coefficient (CCC): AS 0.84; AI 0.82) and agreement (percentage error (PE): AS 26.3 %; AI 26.2 %) with the reference technique. In severe AS, SVPC CAL (PE 25.7 %; CCC 0.85) but not SVPC UNCAL (PE 50.4 %; CCC 0.38) was reliable. Neither calibrated nor uncalibrated PC (SVPC CAL: PE 51.5 %; CCC 0.49; SVPC UNCAL: PE 61.9 %; CCC 0.22) was valid in AI. Trending ability to hemodynamic changes, quantified by the ΔSV vector and the angle θ, was acceptable for each measurement modality.
Conclusions
Transcardiopulmonary thermodilution is valid in aortic valve dysfunction. Calibration of PC substantially improves reliability in aortic valve disease. Calibrated PC is valid in severe AS. Valvuloplasty-induced AI seriously confounds PC measurements. In uncalibrated PC approaches, the relative SV trend is superior to single absolute values.
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Conflicts of interest
AEG and DAR are members of the Medical Advisory Board of Pulsion Medical Systems. DAR has received honoraria for lectures from Edwards Lifesciences. The study was financed solely by institutional sources.
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This article is discussed in the editorial available at: doi:10.1007/s00134-012-2802-y.
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134_2012_2786_MOESM1_ESM.tif
Supplementary material 1 (TIFF 375 kb) Online Resource 1 Regression and correlation analysis, scatter plots, X-axis SV measured with transesophageal echocardiography (SVTEE), Y-axis SV calculated with transcardiopulmonary thermodilution (SVTD, top), calibrated (SVPC CAL, middle), and uncalibrated arterial pulse contour analysis (SVPC UNCAL, bottom) at predefined measurement times from the left to the right with normal prosthetic valve function (post-interventional), with severe aortic stenosis (pre-interventional), and with aortic insufficiency (post-valvuloplasty)
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Petzoldt, M., Riedel, C., Braeunig, J. et al. Stroke volume determination using transcardiopulmonary thermodilution and arterial pulse contour analysis in severe aortic valve disease. Intensive Care Med 39, 601–611 (2013). https://doi.org/10.1007/s00134-012-2786-7
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DOI: https://doi.org/10.1007/s00134-012-2786-7