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Regional vascular responses to asphyxia in the rabbit
European Journal of Clinical Investigation
|February 1, 1977
Summary
Moderate asphyxia in rabbits redirects blood flow to vital organs like the heart and brain, while reducing it to kidneys. This maintains essential organ function during oxygen deprivation.
Area of Science:
- Physiology
- Cardiovascular Research
- Respiratory Physiology
Background:
- Asphyxia, a state of oxygen deprivation, significantly impacts organ function and blood flow distribution.
- Understanding blood flow redistribution during asphyxia is crucial for managing related medical conditions.
Purpose of the Study:
- To investigate the effects of prolonged moderate asphyxia on organ blood flow distribution in spontaneously breathing rabbits.
- To compare blood flow changes in various organs during asphyxia to those observed in shock states.
Main Methods:
- Eight male New Zealand white rabbits were subjected to a 50-minute period of asphyxia.
- Organ blood flow was measured using techniques not specified in the abstract.
- Cardiac output and arterial pressure were monitored and compared to eight control rabbits.
Main Results:
- Cardiac output and arterial pressure remained unchanged during asphyxia.
- Blood flow increased significantly to the heart, brain, and diaphragm.
- Flow to the kidneys and adipose tissue decreased, while flow to the gastro-intestinal tract, liver, skeletal muscle, and carcass remained unchanged.
Conclusions:
- Prolonged moderate asphyxia preferentially supplies blood to vital organs.
- Skeletal musculature and gastro-intestinal tract blood supply are maintained, primarily at the expense of renal blood flow.
- The observed blood flow redistribution patterns during asphyxia resemble those seen in hemorrhagic and endotoxic shock in rabbits.