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Tests of mechanical function

  • G. J. Gibson
Chapter

Abstract

Leonardo da Vinci compared the lungs to a bellows, which is inflated and deflated as air is pumped in and out. Expansion of the lungs is normally achieved by the inspiratory muscles reducing the pressure over the pleural surface of the lungs and ‘sucking’ them out, but equally the lungs can be inflated like a balloon by blowing air into the airway, i.e. by positive pressure ventilation. The mechanical performance of the ‘bellows’ underlies some of the simplest and most useful tests of lung function. If the bellows is abnormally stiff (reduced lung compliance), or the tube by which it empties is abnormally narrow (increased airways resistance), ventilation becomes more difficult.

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Copyright information

© G. J. Gibson 1984

Authors and Affiliations

  • G. J. Gibson
    • 1
  1. 1.Freeman HospitalNewcastle upon TyneUK

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