Effects of Hyperbaric and Hyperoxic Conditions on the Disposition of Drugs: Theoretical Considerations and a Review of the Literature

1. Hyperbaric or hyperoxic or both conditions may affect the disposition of drugs by (1) changes in the catalytic activity of drug metabolizing enzymes, (2) hemodynamic changes and (3) changes in membrane permeability, affecting drug distribution. 2. In isolated microsome preparations from rat liver...

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Bibliographic Details
Published in:General pharmacology 1999, Vol.32 (1), p.127-133
Main Authors: Rump, A.F.E, Siekmann, U, Kalff, G
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Decompression Sickness - metabolism
Diving
Dogs
drugs
General pharmacology
Humans
Hyperbaric Oxygenation
hyperoxia
Hypoxia - metabolism
Kidney - metabolism
Liver - metabolism
Medical sciences
Pharmacokinetics
Pharmacokinetics. Pharmacogenetics. Drug-receptor interactions
pharmacology
Pharmacology. Drug treatments
Rats
Space life sciences
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Summary:1. Hyperbaric or hyperoxic or both conditions may affect the disposition of drugs by (1) changes in the catalytic activity of drug metabolizing enzymes, (2) hemodynamic changes and (3) changes in membrane permeability, affecting drug distribution. 2. In isolated microsome preparations from rat liver, the metabolism rate of aniline, but not of amidopirin, is reduced by hyperoxia. In vivo, the clearance of salicylic acid is enhanced in the dog at 2.8 ATA and 100% O 2, but not at 6 ATA and air, for reasons that are still unknown. The disposition of theophylline, pentobarbital or pethidine is not affected in dogs by hyperbaric or hyperoxic conditions. 3. In human volunteers, hyperbaric or hyperoxic or both conditions do not affect the disposition of gentamycin (2.4 bar, 100% O 2), caffeine or lidocaine (2.5 bar, 100% O 2). 4. In conclusion, a single exposure to hyperbaric or hyperoxic conditions does not seem to affect single-dose pharmacokinetics of drugs eliminated by the kidney (gentamycin) or by the liver with a capacity-limited clearance (pentobarbital, theophylline, caffeine) or with a perfusion-limited clearance (pethidine, lidocaine). The enhancement of salicylic acid clearance in dogs under hyperoxic conditions remains unclear.
ISSN:0306-3623
1879-0011
DOI:10.1016/S0306-3623(98)00074-3