Phase-contrast echo-planar MR imaging: real-time quantification of flow and velocity patterns in the thoracic vessels induced by Valsalva's maneuver.

Details

Serval ID
serval:BIB_8A118024BCB2
Type
Article: article from journal or magazin.
Collection
Publications
Title
Phase-contrast echo-planar MR imaging: real-time quantification of flow and velocity patterns in the thoracic vessels induced by Valsalva's maneuver.
Journal
Journal of Magnetic Resonance Imaging : Jmri
Author(s)
Eichenberger A.C., Schwitter J., McKinnon G.C., Debatin J.F., von Schulthess G.K.
ISSN
1053-1807 (Print)
ISSN-L
1053-1807
Publication state
Published
Issued date
1995
Volume
5
Number
6
Pages
648-655
Language
english
Abstract
Although the clinical manifestations of Valsalva's maneuver are well known, the associated hemodynamic changes in the great vessels have not been extensively studied and documented. In each of six healthy subjects, we evaluated three "quasi-steady-state" phases of Valsalva's maneuver: (1) during normal respiration, (2) during late strain, and (3) 4 seconds after strain release. Continuous flow, velocity, and cross-sectional area measurements were obtained in the superior vena cava, pulmonary trunk, and thoracic aorta with single-shot echo-planar MR imaging (EPI) with velocity-encoded gradients, which provided 256 images in 5 seconds, yielding 26 velocity-encoded images per second. In the superior vena cava, Valsalva's maneuver induced an 11% decrease in average flow volume, a 102% increase in peak flow velocity, a 156% increase in the time velocity integral, and a 37% decrease in cross-sectional area. MR velocity measurements agreed with echocardiographic data and supplied additional information on flow and morphology. EPI showed a reduction in venous return during Valsalva's maneuver by simultaneously assessing flow, velocity, and vessel morphology; this technique appears to be useful in the analysis of flow dynamics of the great vessels.
Keywords
Adult, Aorta, Thoracic/physiology, Blood Flow Velocity/physiology, Echo-Planar Imaging/instrumentation, Female, Fourier Analysis, Humans, Image Processing, Computer-Assisted, Male, Pulmonary Artery/physiology, Reference Values, Valsalva Maneuver/physiology, Vena Cava, Superior/physiology
Pubmed
Web of science
Create date
07/09/2011 18:36
Last modification date
20/08/2019 14:48
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