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Arterial‐alveolar carbon dioxide tension difference and alveolar dead space in halothane anaesthetised horses
Author(s) -
MOENS Y.
Publication year - 1989
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/j.2042-3306.1989.tb02168.x
Subject(s) - pco2 , respiration , anesthesia , dead space , halothane , tidal volume , carbon dioxide , ventilation (architecture) , respiratory minute volume , medicine , respiratory system , body weight , chemistry , anatomy , mechanical ventilation , mechanical engineering , organic chemistry , engineering
Summary Arterial‐alveolar carbon dioxide tension differences (a‐A) P CO 2 and alveolar dead space were measured during clinical halothane anaesthesia of 110 horses with the help of continuous infra‐red carbon dioxide analysis of expiratory gas. Mean (a‐A) P CO 2 was 1.6 ± 0.8 kPa. Alveolar dead space expressed as a percentage of alveolar tidal volume had a mean value of 23 ± 13 per cent. Influence on (a‐A) P CO 2 and alveolar dead space of the following variables was tested statistically: age, weight, body position, respiration mode and duration of anaesthesia. (a‐A) P CO 2 was influenced positively by weight (P<0.0001) and adoption of dorsal recumbency (P<0.01). Alveolar dead space was influenced positively by weight (P<0.0005), adoption of dorsal recumbency (P<0.01), intermittent positive pressure ventilation (P<0.0001) and duration of anaesthesia (P<0.05).