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British Journal of Anaesthesia, 1979, Vol. 51, No. 5 391-398
© 1979 The Board of Management and Trustees of the British Journal of Anaesthesia

other

MEASUREMENT OF THE RELATIVE CONTRIBUTIONS OF RIB CAGE AND ABDOMEN/DIAPHRAGM TO TIDAL BREATHING IN MAN

D. FAITHFULL, B.TECH., J. G. JONES, M.D., M.R.C.P., F.F.A.R.C.S. and C. JORDAN, B.TECH.

Division of Anaesthesia, Clinical Research Centre, Watford Road, Harrow Middlesex HA1 3UJ

A simple mathematical model of the chest wall was constructed so that during tidal breathing the relative volume contributions of the rib cage and abdomen/diaphragm could be measured in man, using four mercury-in-rubber strain gauges around the trunk. From the dimensions of the trunk and the change in circumference determined by the four gauges, the separate contributions of rib cage and abdomen/diaphragm could be determined using a purpose-built analog computer. The system was evaluated in 13 laboratory personnel, and in 13 other subjects before and after anaesthesia. There was a linear relationship between tidal volumes computed and measured at the mouth, over the residual volume to (FRC+1 litre) range, with an error of +8%. The relative contribution of rib cage to tidal breathing showed a large scatter from 5 to 42% with a non-significant tendency to decrease with age.

*Present address: R.A.F. Institute of Aviation Medicine, Farnborough, Hants


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