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Related Experiment Videos

The parallel Lack anaesthetic breathing system

R Ooi1, J A Lack, N Soni

  • 1Magill Department of Anaesthetics, Westminister Hospital, London.

Anaesthesia
|May 1, 1993
PubMed
Summary
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The parallel Lack system, a modified Mapleson A circuit, effectively prevents rebreathing during spontaneous ventilation in lung models, volunteers, and patients. Its performance is comparable to the Magill attachment, ensuring safe anesthesia delivery.

Area of Science:

  • Anesthesiology
  • Respiratory Physiology

Background:

  • The Mapleson A system is a common anesthetic circuit.
  • Modifications aim to improve performance and safety.

Purpose of the Study:

  • To evaluate the parallel Lack system, a novel Mapleson A modification.
  • To determine its efficacy in preventing rebreathing during spontaneous ventilation.

Main Methods:

  • Assessed fresh gas flow requirements to prevent rebreathing.
  • Utilized a lung model, conscious volunteers, and anesthetized patients.
  • Defined rebreathing using ventilation changes, end-expired CO2, and inspired CO2 tension.

Main Results:

  • Rebreathing onset occurred at a fresh gas flow to minute ventilation ratio (VF/VE) of approximately 0.75 in lung models and volunteers.

Related Experiment Videos

  • Results were comparable to the Magill attachment.
  • The parallel Lack system demonstrated Mapleson A functionality in anesthetized patients.

    • Conclusions:

    • The parallel Lack system functions as a Mapleson A circuit.
    • It effectively prevents rebreathing during spontaneous ventilation.
    • Breathing resistance is comparable to the Magill system.