Effect of different ambient pressures on airway resistance.

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Abstract
Airway resistance in simulated dives and altitude (from 0. 5 to 5 atm) have been measured on five subjects (4 males, 1 female) with a plethysmo-graphic method. The use of this method in such conditions is discussed theoretically. The equations Rx/Rl = 0. 57 + 0. 44 P or Rx/R1 = p0- 59 are proposed to represent the results obtained (P in absolute atmosphere; Rx resistance at pressure P; R1 resistance at ground level). They are compared to the data of others and discussed in relation to the airway resistance measured as function of flow or physical properties of ventilated gaseous mixtures. It also appears that inertance of breathed gases interferes in the shape of experimental plethysmographic recordings and that this parameter may be estimated through this technic.