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Related Experiment Videos

Carbon monoxide within circle systems

N Harrison1, A C Knowles, E A Welchew

  • 1Northern General Hospital NHS Trust, Sheffield.

Anaesthesia
|November 1, 1996
PubMed
Summary
This summary is machine-generated.

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Carbon monoxide toxicity concerns led to warnings about soda lime drying out. This study found patients, not soda lime, are the source of carbon monoxide in breathing systems.

Area of Science:

  • Anesthesiology
  • Respiratory Medicine
  • Biomedical Engineering

Background:

  • Reports of carbon monoxide toxicity linked to anesthesia breathing systems prompted regulatory action.
  • The Medicines Control Agency advised against allowing soda lime in circle systems to dry out.

Purpose of the Study:

  • To investigate the source of carbon monoxide detected in circle breathing systems.
  • To measure carbon monoxide levels in vitro and in vivo under various conditions.

Main Methods:

  • In vitro and in vivo experiments were conducted using circle breathing systems.
  • Carbon monoxide levels were measured in both the inspiratory and expiratory limbs of the system.

Main Results:

  • Carbon monoxide was only detected when a patient was connected to the circle system.

Related Experiment Videos

  • Significantly higher carbon monoxide levels were observed in the expiratory limb compared to the inspiratory limb.

    • Conclusions:

    • Patients are the source of carbon monoxide generation within circle breathing systems.
    • The findings challenge previous assumptions about soda lime's role in carbon monoxide production.