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Enflurane, halothane, and aminophylline--uptake and pharmacokinetics
Anesthesia and Analgesia
|August 1, 1983
Summary
Anesthesia with enflurane or halothane does not alter the distribution or elimination of aminophylline (theophylline) in dogs. Prior aminophylline administration also does not affect anesthetic uptake, suggesting differences in cardiac effects are not pharmacokinetic.
Area of Science:
- Veterinary Anesthesiology
- Pharmacokinetics
- Cardiovascular Pharmacology
Background:
- Theophylline, administered as aminophylline, is used clinically.
- Enflurane and halothane are common inhalation anesthetics.
- Interactions between aminophylline and these anesthetics require investigation.
Purpose of the Study:
- To evaluate the impact of enflurane or halothane anesthesia on aminophylline pharmacokinetics.
- To assess the effect of aminophylline on enflurane or halothane uptake.
- To explore the relationship between pharmacokinetic changes and arrhythmogenicity.
Main Methods:
- Fifty-four dogs were allocated to no anesthetic, enflurane, or halothane groups.
- Varying doses of intravenous aminophylline were administered prior to anesthesia induction.
- Theophylline distribution (alpha phase) and elimination (beta phase) were analyzed.
- Anesthetic uptake was measured in relation to aminophylline administration.
Main Results:
- Theophylline redistribution and elimination phases were not significantly altered by enflurane or halothane anesthesia.
- Anesthetic uptake was unaffected by prior aminophylline administration.
- Observed differences in arrhythmogenicity between anesthetics were not linked to pharmacokinetic changes.
Conclusions:
- Enflurane and halothane anesthesia do not significantly alter the pharmacokinetics of intravenous aminophylline in dogs.
- Prior aminophylline administration does not influence the uptake of enflurane or halothane.
- Theophylline pharmacokinetics do not explain observed differences in anesthetic-induced arrhythmogenicity.