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Related Experiment Videos

An interchangeable Mapleson A-E breathing system is practical and cost effective.

M Robinson1, G K Lighthall

  • 1Department of Anesthesia, Stanford University School of Medicine and Palo Alto Veterans Affairs Health Care System, Palo Alto, CA 94304, USA.

Acta Anaesthesiologica Scandinavica
|February 3, 2006
PubMed
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Modifying a Mapleson D breathing system to Mapleson A reduces fresh gas flow (FGF) requirements during anesthesia. This modification offers potential cost and resource savings in low-resource settings.

Area of Science:

  • Anesthesiology
  • Respiratory System Engineering
  • Medical Device Modification

Background:

  • Limited oxygen and anesthesia gas supplies necessitate reduced fresh gas flow (FGF) during inhalational anesthesia.
  • Circle systems are often impractical in resource-limited environments.
  • Investigating modifications to transport breathing apparatus for improved gas efficiency is crucial.

Purpose of the Study:

  • To evaluate the interchangeability between Mapleson D (Map-D) and Mapleson A (Map-A) configurations using a common transport breathing apparatus.
  • To determine if the Map-A configuration can eliminate carbon dioxide (CO2) rebreathing at lower FGF rates compared to Map-D.

Main Methods:

  • A standard Map-D transport system was converted to a Map-A system by repositioning the exhaust valve and fresh gas delivery point.

Related Experiment Videos

  • Comparison of Map-A and Map-D systems was performed under a structured protocol.
  • Key metrics included FGF, FGF/minute ventilation (V(E)), and physiological variables.

    • Main Results:

    • The Map-A configuration achieved a mean decrease in FGF of 2.8 L/min compared to Map-D (P=0.003).
    • FGF/V(E) was significantly lower with Map-A (1.1) versus Map-D (1.8) (P=0.007) without affecting physiologic or anesthetic variables.
    • The reduction in FGF achievable by switching systems correlated with patient respiratory rate (r=0.45, P<0.01).

    Conclusions:

    • Modification of breathing systems to achieve Mapleson A configuration can significantly reduce fresh gas flow requirements.
    • This modification offers potential for cost and resource savings in clinical settings.
    • Appropriate ventilation can be maintained at lower FGF rates, enhancing efficiency.