British Journal of Anaesthesia, Vol 76, Issue 3 369-373, Copyright © 1996 by The Board of Management and Trustees of the British Journal of Anaesthesia
H. J. Spens, G. B. Drummond and P. K. Wraith
Changes in the expiratory dimensions of the rib cage and abdomen on
induction of anaesthesia with eltanolone, propofol and thiopentone were
measured in 76 patients using respiratory inductance bands. Calibration of
the respiratory inductance plethysmograph was by simultaneous flow
measurement with a pneumotachograph. Movement of the vertebral column was
restrained with a rigid mattress to allow volume change to be estimated
more accurately from rib cage and abdominal dimensions. Rib cage volumes
decreased by a median of 125 ml, while the median change in the abdominal
compartment was 0. These findings suggest that a reduction in rib cage
volume may contribute to the decrease in functional residual capacity after
induction of anaesthesia, but that changes in the diaphragmatic-abdominal
compartment are not important.
CLINICAL INVESTIGATIONS
Changes in chest wall compartment volumes on induction of anaesthesia with eltanolone, propofol and thiopentone
University Department of Anaesthetics, Royal Infirmary, Edinburgh EH3 9YW; University Department of Medical Physics, Western General Hospital, Edinburgh EH4 2XU
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