ELECTROLYTES, CLOTTING IN BLOOD LOSS AND NORETHYNODREL 



855 



Between 21 and 38 percent losses of total blood volume (2 punctures), mean 

 values for magnésium concentrations rose 0.26 mEq/1, p < .005 (t test [Fig. 3, 

 expt. 5]). When the average slope was extended to 20 and 40 percent hemorrhage, 

 the computed magnésium shift with hemorrhage, AMg, was 0.31 mEq/1. When 

 each pair of magnésium concentrations was extrapolated to 20 and 40 percent 

 hemorrhage, the paired magnésium shifts averaged 0.32 + 0.22 mEq/1. The 

 results for calcium concentrations were more variable: between 20 and 40 percent 

 hemorrhage ACa was computed as 0.16 mEq/1; the paired calcium shift was 



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Fig. 3. 



Sérum magnésium and calcium changes with hemorrhage, normal rats, two cardiac punctures. 

 Average values of the ions at 21.4 and 38.4 percent hemorrhage were extrapolated to 20 and 

 40 percent hemorrhage. The calculated shifts were AMg 0.31 mEq/1; ACa 0.16 mEq/1. Vertical 



bars, ± 1 SD. Expt. 5. 



