Symptoms of Decompression 



699 



4:14; 445 mm.; pulse 78; I take three breaths of oxygen; dizziness; 

 the pulse rate falls at once to 63. 



4:18; 452 mm.; pulse 79; five times I take breaths of oxygen, each 

 separated by two breaths of air. 



4:20; 450 mm.; the pulse has gone down to 63. The bird, thrown 

 into the air, falls whirling, and lets itself be caught in the hand. 



4:24; 465 mm.; pulse 72; I make an effort and rise; the pulse 

 rises immediately to 84. 



4:26; 490 mm.; pulse 72; I take some breaths of oxygen; dizziness. 



4:29; 495 mm.; pulse 60. 



4:33; 500 mm.; pulse 65; several breaths of oxygen; the pulse 

 falls to 64; I try in vain to whistle. 



4:37; 540 mm.; pulse 69; the bird refuses to fly from above the 

 cage, but is quite revived. 



4:38; 555 mm.; I cannot whistle. 



4:40; 590 mm.; pulse 63; I begin to be able to whistle easily 

 enough. 



4:45; 759 mm.; pulse 58; temperature under the tongue, 36.6°. 



The interior temperature of the apparatus has not varied. 

 In this first experiment, the breaths of oxygenated air were 

 intermittent, and the effect of each appeared immediately. Nausea 



Fig. 57 — Sudden modifications in the pulse rate by intermittent respira- 

 tions of superoxygenated air. Upper graph, progress of decom- 

 pression; lower graph, pulse rate; O, inspiration of oxygen. 



