[The characteristics of the reaction of the rabbit respiratory system to CO2 under hyperbaric conditions].

Under the increase of the nitrogen-oxygen mixture pressure from 6.13 to 30.0 kg/cm2, the respiratory response to a hypercapnic stimulus weakened in alert rabbits: the total increase of the lung ventilation decreased, and the ventilatory response of the respiratory system in hyperbaric conditions occurred in great values of the PaCO2. The data obtained suggest that the hyperbarism both suppresses the lung ventilation and disturbs the regulation of respiration due to a high density of the inhaled gas mixture rather than to nitrogen's narcotic effect.