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A study of acid-base equilibrium in altitudinal hypoxia
Physiologie (Bucarest)
|April 1, 1985
Summary
Hypoxia exposure in rats at high altitudes caused gaseous alkalosis and hypocapnia, with effects intensifying with altitude and duration. Adrenaline administration induced acidosis, while adrenalectomy led to mixed alkalosis.
Area of Science:
- Physiology
- Environmental Medicine
- Biochemistry
Background:
- High altitude exposure presents significant physiological challenges.
- Understanding acid-base equilibrium shifts during hypoxia is crucial for human and animal adaptation.
- Previous research indicates complex responses to simulated high-altitude environments.
Purpose of the Study:
- To investigate the impact of varying altitudes and exposure durations on rat acid-base balance.
- To determine the effects of adrenaline and adrenalectomy on hypoxic acid-base responses.
Main Methods:
- Thirteen groups of male rats were exposed to simulated altitudes (2,200m, 5,000m, 8,000m) in a barochamber.
- Exposure was both acute (2 hours) and chronic (up to 21 days).
- Acid-base equilibrium parameters, including gas levels and electrolytes, were measured. Adrenaline and noradrenaline were administered, and adrenalectomized rats were studied.
Main Results:
- A direct correlation was observed between altitude, exposure time, and the development of gaseous alkalosis and hypocapnia.
- Decreased oxygen pressure, excess base, and actual bicarbonate levels were noted.
- Intraperitoneal administration of adrenaline and noradrenaline resulted in an acidotic effect.
- Adrenalectomized rats exposed to hypoxia exhibited a mixed alkalosis (both respiratory and metabolic).
Conclusions:
- Hypoxia-induced gaseous alkalosis and hypocapnia are dose-dependent on altitude and exposure duration.
- The adrenal system plays a significant role in modulating acid-base responses to hypoxia.
- Further research is warranted to explore therapeutic interventions for high-altitude related physiological disturbances.