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Pulmonary vein flow pattern in man during thoracotomy

E Skagseth

    Scandinavian Journal of Thoracic and Cardiovascular Surgery
    |January 1, 1976
    PubMed
    Summary
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    Pulmonary vein flow (PVF) patterns in patients with normal hearts were similar to canine models and caval flow. Right atrial pressure influenced PVF, with reversal during atrial systole in some cases.

    Area of Science:

    • Cardiovascular Physiology
    • Respiratory Physiology

    Background:

    • Understanding pulmonary vein flow (PVF) is crucial for cardiovascular and respiratory research.
    • Previous studies established PVF patterns in animal models, but human data, especially during surgery, is less defined.

    Purpose of the Study:

    • To characterize the pattern of pulmonary vein flow (PVF) in human subjects with normal hearts.
    • To investigate the relationship between PVF and other hemodynamic parameters like pulmonary artery flow, pressures, and atrial pressures.

    Main Methods:

    • Utilized an electromagnetic flowmeter to trace PVF in 10 patients undergoing surgery for pulmonary diseases.
    • Simultaneously recorded instantaneous pulmonary artery flow, ECG, pulmonary artery pressure, and left atrial pressure.

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    Main Results:

    • Observed pulsatile PVF patterns that closely resembled those found in dogs and were similar to the caval flow pattern.
    • Identified a consistent inverse relationship between the right atrial pressure contour and the PVF pattern.
    • In 3 patients, atrial systole caused a reversal of PVF; otherwise, flow was forward throughout the cardiac cycle.
    • Positive pressure ventilation had a minimal effect on PVF.

    Conclusions:

    • Human pulmonary vein flow exhibits distinct pulsatile patterns influenced by cardiac mechanics, particularly right atrial pressure.
    • The findings suggest conserved physiological mechanisms of venous flow across species and circulatory systems.
    • PVF is predominantly forward but can be transiently reversed by atrial systole in certain physiological conditions.