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Influence of Lung Volume History on Closing Volume Measurement During Anaesthesia
Author(s) -
Santesson J.
Publication year - 1978
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1978.tb01324.x
Subject(s) - medicine , anesthesia , supine position , functional residual capacity , lung volumes , general anaesthesia , bolus (digestion) , tidal volume , expiration , spirometer , airway , respiratory system , surgery , lung , bronchoconstriction , exhaled nitric oxide
Airway closure measurements were made with the bolus technique on eight healthy subjects, who were in a supine position prior to and during anaesthesia. Measurements were made on an expiration following vital capacity (VC) and 30% VC. Closing volume (CV) was calculated prior to anaesthesia, and closing capacity (CC)—functional residual capacity (FRC) was estimated during anaesthesia. When measured from VC, CV was 703±20 ml (s.e. mean) and from 30% VC it was 440±51 ml (s.e. mean) ( P< 0.005) prior to anaesthesia. When measured from VC, CC‐FRC was 370±34 ml (s.e. mean), and from 30% VCit was 343±37 (s.e. mean) ( P >0.05) during anaesthesia. It is concluded that volume history has little effect on CC measurement during anaesthesia and artificial ventilation, but a major influence on CC measurement in the conscious patient. Hence, it is suggested that CC, within the tidal range, is increased during anaesthesia.