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Related Experiment Videos

Ventilatory function in the Eisenmenger syndrome.

C G MacArthur, D Hunter, G J Gibson

    Thorax
    |June 1, 1979
    PubMed
    Summary
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    Adults with Eisenmenger syndrome and intracardiac defects show mild ventilatory defects. Carbon monoxide transfer factor may help diagnose early pulmonary vascular disease in infants with heart defects.

    Area of Science:

    • Pulmonary Medicine
    • Cardiology
    • Respiratory Physiology

    Background:

    • Eisenmenger syndrome involves severe pulmonary vascular disease secondary to intracardiac shunts.
    • Understanding the impact on lung function is crucial for patient management.

    Purpose of the Study:

    • To assess ventilatory function and carbon monoxide transfer factor in adult patients with post-tricuspid intracardiac defects and Eisenmenger syndrome.
    • To explore the potential utility of carbon monoxide transfer factor for early diagnosis of pulmonary vascular disease in infants.

    Main Methods:

    • Pulmonary function tests including lung volumes, maximal expiratory flows, and pressure-volume curves.
    • Measurement of carbon monoxide transfer factor (DLCO) corrected for hemoglobin.
    • Helium dilution technique to assess lung volumes and exclude poorly ventilated spaces.

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    Main Results:

    • Mild ventilatory defects observed, characterized by increased residual volume and closing capacity, and reduced lung volumes and expiratory flows, especially at low lung volumes.
    • One patient exhibited reduced elastic recoil at low lung volumes.
    • Carbon monoxide transfer factor was 77% of predicted normal values after correction.

    Conclusions:

    • Patients with Eisenmenger syndrome and intracardiac defects present with consistent, mild ventilatory impairments.
    • Sequential assessment of carbon monoxide transfer factor could aid in the early detection of pulmonary vascular disease in infants with large intracardiac defects, as it may initially be elevated due to high pulmonary blood flow before declining.