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Interaction between cold and hypoxia on pulmonary circulation in COPD

M Bedu1, H Giraldo, H Janicot

  • 1Laboratoire d'Explorations Fonctionnelles Respiratoires et Sportives, CHU Clermont-Ferrand, France.

American Journal of Respiratory and Critical Care Medicine
|April 1, 1996
PubMed
Summary

Mild cold exposure increased pulmonary vascular resistance in severe hypoxic chronic obstructive pulmonary disease (COPD) patients. Oxygen supplementation negated this effect, highlighting the impact of hypoxia on COPD hemodynamics.

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Area of Science:

  • Pulmonary Medicine
  • Cardiovascular Physiology
  • Environmental Medicine

Background:

  • Chronic obstructive pulmonary disease (COPD) affects pulmonary hemodynamics.
  • Hypoxia and environmental stressors like cold can exacerbate COPD complications.
  • Understanding these interactions is crucial for patient management.

Purpose of the Study:

  • To investigate the impact of localized cold exposure on pulmonary hemodynamics in COPD patients.
  • To assess the role of hypoxia in mediating cold-induced hemodynamic changes.
  • To determine if oxygen supplementation can mitigate these effects.

Main Methods:

  • Pulmonary hemodynamic measurements were taken in 19 COPD patients at sea level and 7 at high altitude (2,640 m).
  • Localized cold air (5°C) was applied to the forehead for 10 minutes.

Related Experiment Videos

  • Measurements included pulmonary vascular resistance (PVR) before and during cold exposure, with and without oxygen supplementation at high altitude.

    • Main Results:

    • At sea level, cold exposure increased PVR by 24% in severe hypoxic patients (PaO2 < 50 mm Hg).
    • At high altitude, PVR increased by 15% without oxygen.
    • Oxygen supplementation prevented the increase in PVR during cold exposure at high altitude.

    Conclusions:

    • Mild, localized cold exposure increases pulmonary vascular resistance in COPD patients with severe hypoxia.
    • Hypoxia is a key factor in the pulmonary hemodynamic response to cold.
    • Oxygen therapy can counteract the adverse hemodynamic effects of cold exposure in these patients.