Samples taken from the ureters of a man with severe one-sided renal artery stenosis gave the results shown in the table below. Plasma creatinine level was 1 mg/100 ml and the PAH level was 3 mg/100 ml. In this patient:

 a. False Creatinine clearance (UV/P) was 20 ml/minute on the left and 60 ml/minute (normal) on the right.

b. True From PAH clearance – a very low value.

c. False Blood flow=plasma flow x 1/1- Ht= 300 x 3/2=450 ml/minute.

d. False The left side had the abnormality.

e. True Due to excessive renin release from the ischaemic kidney; the excessive renin leads to excessive formation of angiotensin I and angiotensin II; the latter constricts blood vessels and increases plasma volume.