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Related Experiment Videos

Dependency of hypoxic pulmonary vasoconstriction on temperature

J L Benumof, E A Wahrenbrock

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |January 1, 1977
    PubMed
    Summary

    Hypothermia inhibits hypoxic pulmonary vasoconstriction, reducing blood flow responses. Conversely, hyperthermia enhances this response, impacting pulmonary vascular resistance. This study explores temperature effects on lung blood flow regulation.

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    Area of Science:

    • Physiology
    • Cardiovascular Research
    • Respiratory Medicine

    Background:

    • Hypoxic pulmonary vasoconstriction (HPV) is a critical mechanism for matching lung perfusion to ventilation.
    • The influence of body temperature on HPV is not fully understood.
    • Pulmonary vascular resistance (PVR) regulation is vital for maintaining oxygenation.

    Purpose of the Study:

    • To investigate the impact of altered body temperatures on the hypoxic pulmonary vasoconstriction response.
    • To determine how hypothermia and hyperthermia affect pulmonary blood flow and vascular resistance during hypoxia.

    Main Methods:

    • Utilized open-chested dogs with selective hypoxia applied to the left lower lobe.
    • Measured blood flow and calculated vascular resistance using electromagnetic flowmetry.

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  • Compared HPV responses at normothermia (37°C), hypothermia (31.1°C), and hyperthermia (40.0°C).

    • Main Results:

    • At 37°C, hypoxia decreased lobar blood flow by 51% and increased PVR by 155%.
    • Hypothermia (31.1°C) significantly blunted the HPV response (26% decrease in blood flow).
    • Hyperthermia (40.0°C) enhanced HPV (60% decrease in blood flow), while hypothermia alone increased PVR.

    Conclusions:

    • Hypothermia inhibits hypoxic pulmonary vasoconstriction.
    • Hyperthermia enhances hypoxic pulmonary vasoconstriction.
    • The mechanism of hypothermic inhibition may involve pre-existing vasoconstriction.