Doppler echocardiographic assessment of the aortic prosthetic valves by means of the continuity equation.

TAKAMI Y, ARIKI H, MIYATA Y, OHIMYA T, ISHIHARA T, ITO T

doi:10.11392/jsao1972.22.785

Bibliographic Information

Other Title

連続の式を用いたドップラー心エコー法による大動脈弁位人工弁の機能評価

Description

Continuous and pulsed wave Doppler echocardiography were performed in 65 patients with the aortic prosthetic valves to test the usefulness of the parameters by the continuity equation, i. e. effective orifice area (EAO), Doppler velocity index (DVI), aortic stenotic ratio (ASR), comparing them with the maxPG by the Bernoulli equation. The results were 1) DVI and ASR were independent of the valve sizes in contrast to maxPG and EOA, which were significantly influenced by them. 2) EOA, DVI, and ASR were correlated inversely with the maxPG. 3) Reduced opening angles of the prosthetic valves were observed in the patients who showed the low DVI and ASR despite of the normal maxPG, since the blood flow through the prosthetic valve was decreased by other factors, such as mitral prosthetic valve, mitral stenosis, mitral regurgitation, and low stroke volume, etc. 4) DVI 0.25 and ASR 0.27 are thought to suggest the dysfunction of the prosthetic valve in the aortic position. We concluded that DVI and ASR by the continuity equation are easier and more useful for the functional assessment of the aortic prosthetic valve than the maxPG which is more affected by various conditions.

Journal

Jinko Zoki

Jinko Zoki 22 (3), 785-788, 1993

JAPANESE SOCIETY FOR ARTIFICIAL ORGANS

Keywords

Details 詳細情報について

CRID: 1390282679932290432

NII Article ID: 130001732574

DOI: 10.11392/jsao1972.22.785

ISSN: 18836097; 03000818

Text Lang: ja

Data Source

JaLC
CiNii Articles

Abstract License Flag: Disallowed

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