Validation of applications of indexed aortic prosthetic valve areas calculated by Doppler echocardiography

Abstract

Doppler echocardiographic evaluation of aortic valve prostheses is based on the use of variables heretofore validated mostly for native valves. Accordingly, this study examined the validity and relative usefulness of the Doppler valve gradient and area measurements in 31 patients (mean age 69 +/- 10 years) 20 +/- 4 months after implantation of a given type of aortic bioprosthesis ranging in size from 19 to 29 mm. Valve area data obtained with both the standard and simplified continuity equations were compared with known in vitro prosthetic valve area measurements and an excellent correlation was obtained between the standard and simplified continuity equations (r = 0.98, SEE +/- 0.07 cm2, p less than 0.0005) and between in vivo and known in vitro prosthetic valve areas (r = 0.86, SEE +/- 0.16 cm2, p less than 0.0005). Peak gradient ranged from 10.8 to 75.0 mm Hg (mean 35 +/- 16) and mean gradient from 7.6 to 43.7 mm Hg (mean 20.5 +/- 9.5). The correlations between prosthetic valve gradient and in vivo area were r = -0.53, SEE +/- 14 mm Hg and r = -0.49, SEE +/- 8.63 mm Hg for peak and mean gradient, respectively. These relations were improved by indexing valve area by body surface area. The best correlations were obtained between indexed valve area and a quadratic function of the gradient (r = -0.72, SEE +/- 11.72 mm Hg and r = -0.70, SEE +/- 7.28 mm Hg for peak and mean gradient, respectively), reflecting a curvilinear relation.(ABSTRACT TRUNCATED AT 250 WORDS)

Journal

Title: Journal of the American College of Cardiology

Abbreviated Title: Journal of the American College of Cardiology

Publisher: Elsevier BV

ISSN (Print): 07351097

Publication date Created: September 1990

Publication date (Print): September 1990

Volume: 16

Issue: 3

Pages: 637-643

Article

PubMed ID: 2387937

Copyright statement: © 1990

License:

https://www.elsevier.com/tdm/userlicense/1.0/

https://www.elsevier.com/open-access/userlicense/1.0/

Product

Self URI (article page): https://linkinghub.elsevier.com/retrieve/pii/073510979090355S