PMID: 6407365Jul 1, 1983Paper

Physostigmine antagonizes morphine-induced respiratory depression in human subjects

Anesthesiology
I Snir-MorM Bahar

Abstract

The effect of physostigmine on the respiratory depression induced by morphine was studied in human subjects who received morphine as part of their preanesthetic medication. After pretreatment with droperidol (2.5-5 mg, iv) to prevent nausea, the change in minute ventilation was measured in 16 patients in response to increasing concentrations of inspired CO2 (CO2-response curve) by the rebreathing method. This was repeated 30 min after morphine (0.166 mg/kg, iv) in nine subjects and in seven controls who did not receive morphine and again 5-10 min after physostigmine (13-33 micrograms/kg, iv) in all subjects. All subjects were given N-butylhyoscine hydrobromide (5 mg, iv) to antagonize any peripheral cholinergic effects of physostigmine. Morphine decreased the mean slope of the CO2-response curve from 1.78 +/- 0.18 to 1.12 +/- 0.14 1 X min-1 X mmHg-1 (P less than 0.01) and increased the alveolar PCO2 for a fixed minute ventilation (position of curve) from 45.0 +/- 1.3 to 51.9 +/- 1.5 mmHg (P less than 0.001). Physostigmine restored the mean slope after morphine to control value, i.e., 1.79 +/- 0.231 X min-1 X mmHg-1, and position to 46.2 +/- 1.2 mmHg (P less than 0.001). Physostigmine did not increase the slope or alter the posi...Continue Reading

Citations

Nov 1, 1984·Canadian Anaesthetists' Society Journal·M S ShulmanJ Brebner
Dec 17, 1997·Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie·A FassoulakiC Derveniotis
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