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Related Experiment Videos

Lung membrane diffusing capacity, heart failure, and heart transplantation.

B Mettauer1, E Lampert, A Charloux

  • 1Faculté de Medécine, Services des Explorations Fonctionnelles Respiratoires de des Explorations Fonctionnelles du Système Circulatoire, Strasbourg, France.

The American Journal of Cardiology
|March 12, 1999
PubMed
Summary
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Pulmonary diffusing capacity for carbon monoxide (DLCO) is reduced in heart failure. After transplantation, decreased pulmonary capillary blood volume (Vc) is not fully compensated by membrane conductance, impacting DLCO.

Area of Science:

  • Pulmonary medicine
  • Cardiology
  • Physiology

Background:

  • Reduced pulmonary diffusing capacity for carbon monoxide (DLCO) is characteristic of chronic heart failure and persists post-heart transplantation.
  • This reduction may stem from permanent alterations in alveolar-capillary membrane diffusion or pulmonary capillary blood volume (Vc).

Purpose of the Study:

  • To investigate the components of DLCO, specifically membrane conductance and Vc, before and after heart transplantation.
  • To determine the factors contributing to persistent DLCO reduction in heart failure patients post-transplant.

Main Methods:

  • Measured DLCO, membrane conductance, and Vc using the Roughton and Forster method at varying alveolar oxygen concentrations.
  • Evaluated 21 heart failure patients (NYHA class III-IV) pre- and post-transplantation, alongside 21 healthy controls.

Related Experiment Videos

  • Assessed DLCO/alveolar volume (VA), membrane conductance/VA, and thetaVc/VA.

    • Main Results:

    • Heart transplantation normalized pulmonary capillary pressure and increased cardiac index.
    • Pre-transplantation DLCO was reduced, but DLCO/VA was normal, suggesting a restrictive ventilatory pattern.
    • Post-transplantation, DLCO/VA remained unchanged due to decreased Vc not being fully compensated by membrane conductance.
    • Membrane conductance negatively correlated with heart failure duration, indicating potential irreversible alveolar-capillary membrane damage.

    Conclusions:

    • Reduced DLCO in heart failure is linked to a restrictive ventilatory pattern, with membrane conductance changes compensated by Vc.
    • Post-transplantation, reduced Vc due to hemodynamic normalization is inadequately compensated by membrane conductance.
    • Prolonged heart failure may cause irreversible alterations to the alveolar-capillary membrane, affecting DLCO.