Symptoms of Decompression 661 



Subchapter I 

 SYMPTOMS OF DECOMPRESSION 



Experiment CCXV. March 2. Little dog, put into the big cylinder. 



2:05; Normal pressure; respiratory rate 16. 



2: 15; Pressure 40 cm. respiratory rate 16. 



2:20; Pressure 26 cm. respiratory rate 24. 



2:26; pressure 22 cm. respiratory rate 40. Lies down; respiration 

 dicrotic; it breathes first by the thorax, and then the abdomen rises. 



2:36; Pressure 20 cm.; respiratory rate 44. 



2:42; Pressure 19 cm.; respiratory rate 36. 



2:47; Pressure 18 cm.; respiratory rate 40. 



2:55; Inlet cock opened a little; pressure rises to 21 cm. Respira- 

 tory rate falls to 30. Cock closed. At 3:00, the pressure is only 19 cm.; 

 respiratory rate remains 30. 



3:05; Pressure 18 cm.; Respiratory rate 28. 



3:10; Pressure 22 cm.; Respiratory rate 18. 



3:14; Pressure 23 cm.; Respiratory rate 16. 



3:16; Pressure 25 cm.; Respiratory rate 14. 



3:18; Return to normal pressure. 



3:24; Respiratory rate 14. 



The animal is in good condition. 



Experiment CCXVI. March 21. Large spaniel at 3 o'clock in the 

 large decompression cylinder. Its rectal temperature is 38.5°. At 

 4:58, pressure is only 25 cm. Normal pressure rapidly restored; tem- 

 perature of the animal dropped to 36.5°. 



Experiment CCXVII. April 2. Female bulldog, having already had 

 some operations; fastened in the same apparatus. 



4:40 at normal pressure respiratory rate 24, pulse 125, rectal 

 temperature 39°. 



4:45; pressure 46 cm.; respiratory rate 24, pulse 110. 



4:55; pressure 36 cm., respiratory rate 22, pulse 100. 



5:05; the pump is stopped and the air returns to normal pressure; 

 respiratory rate 20, pulse 120. 



The femoral artery has been bared and around it has been placed 

 a copper wire which records its movements and allows the pulse to 

 be counted. 



5:35; the pump is set in operation and has brought the pressure to 

 46 cm.; respiratory rate 18, pulse 104. 



5:45; pressure 36 cm., respiratory rate 24, pulse 100. 



6:15; pressure 41 cm., respiratory rate 18, pulse 100. 



6:20; normal pressure; rectal temperature 38.8°. 



Experiment CCXV HI. April 23. Dog, which has been given a hypo- 

 dermic injection of 5 centigrams of morphine hydrochloride. 



At 4:30, put into the large cylinder with a manometer in the left 

 femoral artery. Respiratory rate 20, pulse 126. 



At 4:32, pressure is 60 cm., respiratory rate 24 and pulse 120. 



At 4:35, pressure is 45 cm., respiratory rate 33 and pulse 184. 



