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Clinical evaluation of the Lack coaxial breathing circuit in small animal anaesthesia
Author(s) -
WATERMAN A. E.
Publication year - 1986
Publication title -
journal of small animal practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 67
eISSN - 1748-5827
pISSN - 0022-4510
DOI - 10.1111/j.1748-5827.1986.tb02256.x
Subject(s) - medicine , capnography , anesthesia , fresh gas flow , breathing , respiratory rate , ventilation (architecture) , coaxial , heart rate , mechanical engineering , engineering , sevoflurane , electrical engineering , blood pressure
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.