EFFICIENCY OF BREATHING SYSTEMS A AND D IN THE CARDEN VENTMASTA VENTILATOR

We have compared the efficiency of the enclosed Magill attachment (System A) and the co-axial System D (Bain) in the Carden Ventmasta ventilator using both systems, each under five different ventilatory conditions, in each of five anaesthetized patients. Efficiency was assessed in terms of the effec...

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Bibliographic Details
Published in:British Journal of Anaesthesia 1993-11, Vol.71 (5), p.741-746
Main Authors: THAM, E.J., DAVIES, R., SLADE, J.M., MAPLESON, W.W.
Format: Article
Language:English
Subjects:
Adult
Anesthesia
Anesthesia, Closed-Circuit
Anesthesia, Inhalation
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Anesthesia: equipment, devices
Bain system
Biological and medical sciences
breathing systems
Carden Ventmasta
efficiency
Female
Humans
Magill attachment
Male
Medical sciences
Middle Aged
Pulmonary Alveoli - physiology
Respiration - physiology
Tidal Volume - physiology
Ventilation
Ventilators, Mechanical
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Summary:We have compared the efficiency of the enclosed Magill attachment (System A) and the co-axial System D (Bain) in the Carden Ventmasta ventilator using both systems, each under five different ventilatory conditions, in each of five anaesthetized patients. Efficiency was assessed in terms of the effective alveolar ventilation as a fraction of the fresh gas flow. For System A, efficiency increased from a mean of 0.37 when the total ventilation was only 50% of the fresh gas flow, to a mean of 0.74 when ventilation was 2.3 times the fresh gas flow. The efficiency was substantially and significantly less with System D:75% of that for System A at the smaller total ventilation (95% Cl 65–85%) and 65% at the larger (95% Cl 59–71%). A critical examination is made of conflicting definitions and terminology of the efficiency of breathing systems. (Br. J. Anaesth. 1993; 71: 741–746).
ISSN:0007-0912
1471-6771
DOI:10.1093/bja/71.5.741