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Inhalational anesthesia and histamine release during bronchospasm.

J M Hermens, G Edelstein, J M Hanifin

|July 1, 1984

Summary

Inhalational anesthetics like halothane reduce airway resistance during Ascaris-induced bronchospasm in dogs. Halothane

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Area of Science:

Anesthesiology and Pharmacology
Pulmonary Physiology
Allergy and Immunology

Background:

Inhalational anesthetics are commonly used during procedures that may involve bronchospasm.
Histamine release plays a key role in the pathophysiology of bronchospasm.
The specific effects of different anesthetics on histamine-mediated bronchospasm require further elucidation.

Purpose of the Study:

To investigate the influence of thiopental and halothane on histamine release and bronchospasm induced by Ascaris antigen aerosol in Basenji-Greyhound dogs.
To determine whether halothane's protective effect on airways is mediated by inhibition of histamine release.

Main Methods:

Basenji-Greyhound dogs were anesthetized with either thiopental or halothane.
Bronchospasm was induced by a five-minute challenge with Ascaris antigen aerosol.
Pulmonary resistance (RL), dynamic compliance (Cdyn), and arterial plasma histamine levels were measured before, during, and after antigen challenge.

Main Results:

Halothane significantly attenuated the increase in pulmonary resistance compared to thiopental.
Both anesthetics resulted in similar decreases in dynamic compliance.
Arterial plasma histamine levels were not significantly different between the thiopental and halothane groups, despite the difference in airway resistance.
Peak histamine levels occurred at 5 minutes post-challenge, while peak changes in RL and Cdyn occurred at 10 minutes.

Conclusions:

Halothane provides a protective effect against Ascaris-induced bronchospasm, independent of its effect on histamine release from mast cells.
The mechanism of halothane's airway protection is not related to the inhibition of histamine release.
Further research is needed to explore the precise mechanisms underlying halothane's bronchodilatory effects in this model.

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