380 PHYSIOLOGY OF INDUCED HYPOTHERMIA 



TABLE II 

 Properdin Titers of Dogs Subjected to Hemorrhagic Shock during Hypothermia 



Arterial 



pressure Properdin titers 



Bleeding (mm. Hg) during shock 



Dog Body volume , ^ v i ^ ; > 



no. temp. (cc./kg.) Mean Range Initial 2 hrs. 6 hrs. 



P-S2 Under 28° C. Z1 45 30-60 12 12 12 



P-S3 Under 28° C. 39 40 30-60 12 12 12 



a brief period of hemorrhagic hypotension from which he survives. The properdin 

 titer falls markedly within the first two or three hours. It remains low for several 

 days, and then overshoots. However, when two animals were subjected to hypo- 

 thermia while their blood pressure was being lowered, the properdin titers remained 

 high not only for two hours but for six hours as well (table II). 



We are intrigued by these findings and intend to pursue this matter in the near 

 future. 



