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Related Experiment Videos

Bronchovascular adjustments after pulmonary embolism

A B Malik, S E Tracy

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |September 1, 1980
    PubMed
    Summary

    Pulmonary microembolization initially reduces bronchial blood flow due to vasoconstriction. However, bronchial blood flow increases significantly two weeks post-embolization, suggesting neovascularization in response to pulmonary vascular obstruction.

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    Area of Science:

    • Physiology
    • Cardiovascular Research
    • Pulmonary Medicine

    Background:

    • Pulmonary microembolization (PME) significantly impacts pulmonary hemodynamics.
    • Bronchial circulation plays a crucial role in lung tissue health and response to injury.

    Purpose of the Study:

    • To investigate the temporal changes in bronchial blood flow (Qb) following PME.
    • To understand the relationship between altered bronchial perfusion and bronchovascular resistance.

    Main Methods:

    • PME was induced in 14 dogs using glass beads, leading to a threefold increase in pulmonary vascular resistance.
    • Bronchial blood flow (Qb) was quantified using the reference sample method with labeled microspheres.
    • Simultaneous reference blood samples were collected from the femoral and pulmonary arteries.

    Main Results:

    • Bronchial blood flow (Qb) decreased to one-third of baseline at 60 minutes post-PME (P < 0.05), but not at 5 minutes.
    • Qb increased by 300% at 2 weeks post-PME.
    • The initial decrease in Qb correlated with increased bronchovascular resistance, while the later increase correlated with decreased resistance.

    Conclusions:

    • The transient decrease in bronchial blood flow at 60 minutes may be attributed to vasoconstrictor substances released during pulmonary embolism.
    • The gradual increase in bronchial perfusion after 2 weeks suggests neovascularization as a compensatory mechanism for pulmonary vascular obstruction.

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