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The quality of breathing and capnography during laryngeal mask and facemask ventilation
Author(s) -
IVENS D.,
VERBORGH C.,
THI H. PHAN,
CAMU F.
Publication year - 1995
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1995.tb05851.x
Subject(s) - capnography , medicine , tidal volume , anesthesia , ventilation (architecture) , carbon dioxide , laryngeal mask airway , laryngeal masks , airway , respiratory rate , respiratory minute volume , breathing , respiratory system , heart rate , blood pressure , mechanical engineering , ecology , engineering , biology
Summary Clinical measures of ventilation and the relationship between arterial and end‐tidal carbon dioxide tensions were studied during inhalational anaesthesia in 18 patients using a laryngeal mask airway or a facemask. Tidal volumes were similar in both groups but expired minute volume, respiratory rate and physiological deadspace ventilation were significantly increased in the facemask group. Both end‐tidal and arterial carbon dioxide tensions were higher in the laryngeal mask group. Mean arterial to end‐tidal carbon dioxide tension differences ranged from 0.13 to 4.13kPa in the facemask group and from 0–1.73kPa with the laryngeal mask airway. Pooled data analysis revealed a better correlation between arterial and end‐tidal carbon dioxide tensions during laryngeal mask ventilation as compared to facemask breathing. With both techniques the arterial to end‐tidal carbon dioxide tension difference was related to respiratory rate and physiological deadspace ventilation. Estimation of arterial carbon dioxide partial pressure by monitoring end‐tidal carbon dioxide tension is more reliable with the laryngeal mask airway than during facemask breathing, in particular at small tidal volumes.