Clinical evaluation of the Lack coaxial breathing circuit in small animal anaesthesia |
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| Authors: | A E WATERMAN |
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| Institution: | Department of Veterinary Surgery, University of Bristol, Langford, Langford, Bristol. BS18 7DU |
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| Abstract: | The performance of the Lack co-axial breathing circuit was evaluated in 25 anaesthetized dogs breathing spontaneously. Fresh gas flows were adjusted until rebreathing started to occur as judged by capnography. Thus a critical fresh gas flow rate was determined for small (10–15 kg) and larger (15 + kg) dogs. These were 130.5 ± 31.2 and 95.9 ± 13-1 ml/kg/min respectively. In a further twenty dogs weighing over 15 kg a fresh gas flow rate of 120 ml/kg/min was used and was found to be sufficient to prevent rebreathing in all cases. In 11 dogs a direct comparison was made between the Lack and the Magill circuits with fresh gas flows of 120 ml/kg/min and it was found by capnography that while there was minimal or no rebreathing with the Lack system there was substantial rebreathing with the Magill. |
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