Mitral regurgitation determined by radionuclide cardiography: Dependence on posture and exercise

H. Kelbak*, J. Aldershvile, K. Skagen, P. Hildebrandt, S. L. Nielsen

*Corresponding author af dette arbejde

    Publikation: Bidrag til tidsskriftArtikelForskningpeer review

    Abstract

    Objectives - To evaluate dependence of posture and exercise on the degree of mitral regurgitation using combined first pass and equilibrium radionuclide car cardiography. Design - 24 patients with clinically stable chronic mitral regurgitation and sinus rhythm were studied by first pass list mode and simultaneous multigated frame mode equilibrium radionuclide cardiography using red cells labelled with technetium-99m. Results - When patients changed posture from supine to sitting upright; left ventricular volumes decreased considerably. Regurgitation tended to patients with valve prolapse creased in patients with ischaemic heart disease and dilated cardiomyopathy. During submaximal bicycle exercise cardiac output increased without dilatation of the left ventricle. The increase in left ventricular forward stroke volume was more pronounced than that in the total stroke volume, leading to a considerable decrease in the regurgitant flow through the mitral valve. The repeatability and observer variability of radionuclide determination of regurgitation was acceptable, with limits of agreement within about 10%. Conclusions - Change in posture induces a normal haemodynamic response in most patients with chronic mitral regurgitation; the effect of posture on regurgitation depends on the underlying disease. Mild to moderate exercise causes no deterioration in the severity of regurgitation.

    OriginalsprogEngelsk
    Sider (fra-til)156-160
    Antal sider5
    TidsskriftBritish Heart Journal
    Vol/bind72
    Udgave nummer2
    StatusUdgivet - 15 aug. 1994

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