Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/24215
Title: Effective Orifice Area during Exercise in Bileaflet Mechanical Valve Prostheses
Authors: BERTRAND, Philippe 
Pettinari, Matteo
DE CANNIERE, Helene 
GUTERMANN, Herbert 
SMEETS, Christophe 
Verhaert, David
DION, Robert 
Verdonck, Pascal
VANDERVOORT, Pieter 
Issue Date: 2017
Publisher: MOSBY-ELSEVIER
Source: JOURNAL OF THE AMERICAN SOCIETY OF ECHOCARDIOGRAPHY, 30(4), p. 404-413
Abstract: Background: The aims of this study were to investigate the evolution of the transprosthetic pressure gradient and effective orifice area (EOA) during dynamic bicycle exercise in bileaflet mechanical heart valves and to explore the relationship with exercise capacity. Methods: Patients with bileaflet aortic valve replacement (n = 23) and mitral valve replacement (MVR; n = 16) prospectively underwent symptom-limited supine bicycle exercise testing with Doppler echocardiography and respiratory gas analysis. Transprosthetic flow rate, peak and mean transprosthetic gradient, EOA, and systolic pulmonary artery pressure were assessed at different stages of exercise. Results: EOA at rest, midexercise, and peak exercise was 1.66 +/- 0.23, 1.56 +/- 0.30, and 1.61 +/- 0.28 cm(2), respectively (P = .004), in aortic valve replacement patients and 1.40 +/- 0.21, 1.46 +/- 0.27, and 1.48 +/- 0.25 cm(2), respectively (P = .160), in MVR patients. During exercise, the mean transprosthetic gradient and the square of transprosthetic flow rate were strongly correlated (r = 0.65 [P < .001] and r = 0.84 [P < .001] for aortic valve replacement and MVR, respectively), conforming to fundamental hydraulic principles for fixed orifices. Indexed EOA at rest was correlated with exercise capacity in MVR patients only (Spearman r = 0.68, P = .004). In the latter group, systolic pulmonary artery pressures during exercise were strongly correlated with the peak transmitral gradient (r = 0.72, P < .001). Conclusions: In bileaflet mechanical valve prostheses, there is no clinically relevant increase in EOA during dynamic exercise. Transprosthetic gradients during exercise closely adhere to the fundamental pressure-flow relationship. Indexed EOA at rest is a strong predictor of exercise capacity in MVR patients. This should be taken into account in therapeutic decision making and prosthesis selection in young and dynamic patients.
Notes: [Bertrand, Philippe B.; De Canniere, Helene; Smeets, Christophe J. P.; Verhaert, David; Vandervoort, Pieter M.] Ziekenhuis Oost Limburg, Dept Cardiol, Schiepse Bos 6, B-3600 Genk, Belgium. [Pettinari, Matteo; Gutermann, Herbert; Dion, Robert A.] Ziekenhuis Oost Limburg, Dept Cardiovasc Surg, Genk, Belgium. [Bertrand, Philippe B.; De Canniere, Helene; Smeets, Christophe J. P.; Vandervoort, Pieter M.] Hasselt Univ, Fac Med & Life Sci, Diepenbeek, Belgium. [Verdonck, Pascal] Univ Ghent, Dept Biomed Engn, Ghent, Belgium.
Keywords: Mitral valve replacement; Aortic valve replacement; Mechanical valve prostheses; Exercise echocardiography; Hemodynamics;mitral valve replacement; aortic valve replacement; mechanical valve prostheses; exercise echocardiography; hemodynamics
Document URI: http://hdl.handle.net/1942/24215
ISSN: 0894-7317
DOI: 10.1016/j.echo.2016.11.002
ISI #: 000400483500005
Category: A1
Type: Journal Contribution
Appears in Collections:Research publications

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