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Related Experiment Videos

Predictable PaCO2 with two different flow settings using the Mapleson D system.

L O Jonsson1

  • 1Department of Anaesthesia and Intensive Care, Ostersund Hospital, Sweden.

Acta Anaesthesiologica Scandinavica
|April 1, 1990
PubMed
Summary

This study found two fresh gas flow settings for the Mapleson D breathing system are effective for maintaining normocapnia (normal carbon dioxide levels) or mild hypocapnia (low carbon dioxide levels) in adult patients during surgery.

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Rebreathing, resistance and external work of breathing in three different coaxial Mapleson D systems.

Acta anaesthesiologica Scandinavica·1989

Area of Science:

  • Anesthesiology
  • Respiratory Physiology

Background:

  • The Mapleson D coaxial breathing system (Bain circuit) is commonly used in anesthesia.
  • Optimizing fresh gas flow (VFG) and minute ventilation (VE) is crucial for managing ventilation and gas exchange.

Purpose of the Study:

  • To evaluate two distinct VFG and VE settings with the coaxial Mapleson D system.
  • To determine the suitability of these settings for achieving normocapnia and mild hypocapnia in adult surgical patients.

Main Methods:

  • 59 adult patients (ASA I-III) undergoing various surgical procedures with controlled ventilation were studied.
  • Two settings were tested: Alternative A (VFG 75 ml.min-1.kg-1, VE 150 ml.min-1.kg-1) and Alternative B (VFG 110 ml.min-1.kg-1, VE 175 ml.min-1.kg-1).
  • Partial pressure of arterial carbon dioxide (PaCO2) was measured to assess ventilation.

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Main Results:

  • Alternative A resulted in a mean PaCO2 of 5.5 +/- 0.5 kPa, with 92% of patients in the 4.7-6.1 kPa range (normocapnia).
  • Alternative B yielded a mean PaCO2 of 4.4 +/- 0.5 kPa, with 82% of patients in the 3.5-4.9 kPa range (mild hypocapnia).

Conclusions:

  • Both tested VFG and VE settings are clinically suitable for the coaxial Mapleson D system.
  • These settings effectively achieve desired levels of normocapnia or mild hypocapnia in adult surgical patients.