[External respiration and oxygenation of arterial blood in animals in an atmosphere with an increased concentration of oxygen].

In 8 unanesthetized rabbits, the breathing rate, oxygenation of blood, and some other parameters were recorded during 1-hr stay in hyperoxic gas milieau with 40, 60, and 80% oxygen in nitrogen. In 40% mixture, the parameters changed insignificantly. In 60% oxygen, the 1-min respiratory volume first decreased then normalized while oxygenation of blood increased; in 80% mixture, both these parameters decreased due probably, to reduced ventilation, vasoconstrictive effect of oxygen, and shunting of blood in the lungs.