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Intrapulmonary bronchial circulation during hemorrhage.

M Nakai1, M Kawamura, T Kunieda

  • 1National Cardiovascular Center, Osaka, Japan.

Heart and Vessels
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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The sympathoadrenal system significantly impacts bronchial circulation. It powerfully increases resistance and decreases intrapulmonary bronchial blood flow, especially during severe hypotension.

Area of Science:

  • Physiology
  • Pharmacology

Background:

  • The sympathoadrenal system plays a role in regulating circulatory functions.
  • Understanding its effect on bronchial circulation is crucial for respiratory health.

Purpose of the Study:

  • To investigate the influence of the sympathoadrenal system on intrapulmonary bronchial circulation.
  • To evaluate the effects of hemorrhage and adrenergic antagonists on bronchial blood flow and resistance.

Main Methods:

  • Experiments were conducted on 119 anesthetized and artificially ventilated rats.
  • Hypotension was induced via controlled hemorrhage or administration of phenoxybenzamine or bunazosin.
  • Intrapulmonary bronchial blood flow was measured using the microsphere method.

Main Results:

Related Experiment Videos

  • Hypotension, induced by hemorrhage or antagonists, decreased bronchial blood flow in a dose-dependent manner.
  • Bronchovascular resistance significantly increased during severe hemorrhagic hypotension.
  • Changes in vasopressin and renin activity had less influence on these responses.

Conclusions:

  • The sympathoadrenal mechanism exerts a powerful influence on intrapulmonary bronchial circulation.
  • This mechanism increases resistance and decreases blood flow in the bronchial circulation.
  • These findings highlight the importance of the sympathoadrenal system in maintaining bronchial vascular homeostasis.