Blood Volume foUoiving Operations in Man. 



410 



calculated from Arrhenius' formula for the viscosity of suspensions, and some 

 actual figures for blood kindly supplied me by Prof. Bayliss.* 



90 

 8o 



M 



Hi 

 1SX 



<50 

 20 

 10 



40 





.Cuxve for iioimal Wood 'pre SSXLr'e Wtli 





















■aTyiTLg'_§ystolic_3Dloo(i pxeSSTJ-xe : 

















1/ 











01 r. 





K 



o-ooz;z5 























/ 











1 1 1 1 i 1 1 1 I 1 1 1 1 I 1 

 Indic/ites dctudJ jDizJse jsressures for 

 vAjying- sysirolic Jblood pressures dt 

























— , 





























■afferent 



1 . I 



ag-es 



3-' 





'ed 





ZzV 



■er 





























































































































































































































































\ ■ ! 







■ — 

































\ \ 

























































— 1 — 

 1 



1 



















































































































































































































































































































































































1 













































50 60 20 80 90 100 no 120 130 140 150 1.60 170 160 

 Systolic Mood pressure 



Fig. B. 



50 

 46 

 42 



•038 



X 



Pi 

 30 



c| 



■H 



I 



t) 

 tn 



{^i8 



14 



ID 





































d 





















scosit 



1 Vis 



y. Axx 



cosity 



aeiuus f 

 f -plasir 



oxmtL 

 La =10 



la 

 ■3: 



log 57 



of TIO 





















rmal Hood 



= 31-2 



















-A 



' ( 1 T 1 1 ' 1 , 1 1 1 1 1 

 'Fiernre/^ ^iiren hv BdvliSS for C<3.t \ 































cdt ecniivdlent to 



80 yo humdn 

































































































































1 



1 



























































































































































































































' i 



































































































































































> 

























































































































































































































































































































































































10 zo 30 40 so 60 70 80 9o 100 no 120 130 i4d 

 Iidemogiol)iji percentage 



Fig. C. 



* Since this was written Trevan has published figures on viscosity changes ('Bio- 

 chemical Journal,' vol. 12, p. 60), and has employed a different formula. His curve lies 

 at a higher level, but is very similar to that given here within the limits of the 

 haemoglobin values seen in these patients. 



