a: 



CL 



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PLATELETS— VILLALOP.OS, ADELSON and RILEY 187 



^3.7x10-9 3.0x10"^ 



I 200 

 O 



00 



PLATELET COUNT 



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a: 



O 



(O 



UJ 

 UJ 



DC 



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 Hi 



O 



40 



20 



BODY TEMPERATURE 



P-^2 TAGGED 

 PLATELET 

 •TRANSFUSION 



ONSET OF 

 -HYPOTHERMIA 



ONSET OF 

 REWARMING 



100 200 



TIME (minutes) 



Fig. L — Platelet radioactivity P^- (counts per second per platelet). 



300 



TABLE I 



Platelet counts 

 (per cii. mm.) 

 Temp. ° C. aorta 



37 445,000 



25 213,000 



20 28,500 



25 75,000 



30 451,000 



Platelet counts 



(per cu. mm.) 



capillary blood 



(tongue) 



339,000 



199,000 



33,000 



71,500 



466.000 



can be seen that there is no significant difference. Table II shows that capillaries of 

 the spleen, liver, and lung also do not sequester platelets. Tables III, IV, and V 

 show the results of platelet counts carried out simultaneously in the aorta and high 

 in the inferior vena cava in three animals. These counts were taken by means of 

 polyethylene catheters, positioned by means of incisions in the femoral artery and 

 femoral vein. The catheter high in the inferior vena cava was positioned well above 

 the entrance of the hepatic vein into the inferior vena cava. Therefore, it sampled a 



