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Totally closed circuit nitrous oxide/oxygen anaesthesia
British Journal of Anaesthesia
|March 1, 1975
Summary
Totally closed circuit anesthesia using nitrous oxide/oxygen and halothane or opiates demonstrated efficient gas utilization. Oxygen consumption was steady, while nitrous oxide use decreased over two hours during anesthesia.
Area of Science:
- Anesthesiology
- Respiratory Physiology
- Pharmacology
Background:
- Closed-circuit anesthesia systems offer potential for reduced gas consumption.
- Optimizing anesthetic gas delivery is crucial for patient safety and cost-effectiveness.
Purpose of the Study:
- To evaluate gas and anesthetic agent expenditure during totally closed circuit anesthesia.
- To assess the efficacy of nitrous oxide/oxygen mixtures supplemented with halothane or opiates.
Main Methods:
- Totally closed circuit anesthesia was administered using nitrous oxide/oxygen mixtures.
- Halothane was used for spontaneous breathing, and opiates for artificial ventilation.
- Gas and anesthetic expenditure were measured, with inspired oxygen monitored at 30%.
Main Results:
- Average oxygen expenditure was 227 ml/min.
- Nitrous oxide expenditure decreased from 462 ml/min to 110 ml/min over 2 hours.
- Average halothane expenditure was 3.5 ml/hr, with minimal operating theatre atmosphere contamination.
Conclusions:
- Totally closed circuit anesthesia is effective in minimizing anesthetic gas waste.
- This anesthesia technique maintains stable oxygen levels and low halothane exposure.
- Efficient gas management is achievable with closed-circuit anesthesia systems.