RENAL EFFICIENCY AND BLOOD-PRESSURE 



175 



The amount of urea in the blood was not substantially changed, and the 

 amount excreted in the urine was not diminished in any of the above cases. 



The following table, in addition to giving the blood-urea, urinary volume, 

 urea concentration test result, range of the urea percentage, and total urea of the 

 individual specimens of urine in Cases 24 and 25, gives the results observed in 

 four additional high blood -pressure cases where the vasodilator erythrol tetra- 

 nitrate was given for longer periods up to seven days without any administration 

 of urea. The object of this is to show the effects of the vasodilator apart from any 

 disturbance caused by the artificial introduction of urea into the circulation 

 in the application of the urea test. 



Remarks. — Case 24. 

 Case 25. 

 Case 26. 

 Case 27. 

 Case 28. 

 Case 29. 



* E. N. stopped on account of headache. 



Liq. trin. OCji] 3-hourly ; showed early intolerance to erythrol tetranitrate. 



Liq. trin. Ct)ij 3-hourly. 



Erythrol tetranitrate gr. i 4-hourly. 



Erythrol tetranitrate gr. i 4-hourly. 



Erythrol tetranitrate gr. i t.d.s. 



Erythrol tetranitrate gr. i 4-hourly. 



Cases 24 and 29 showed an early intolerance to the vasodilator drug, and 

 the latter in addition showed a very marked reduction in the amount of urine 

 and urea excreted. 



[Q.J.M., July, igae.l G g 



