The clinical significance of the urinary oxygen tension (PuO2) was eva
luated in 60 patients with ischemic heart disease, The PuO2 had fair r
elations to cardiac index and serum creatinine level (r = 0.73 and r =
0.73, respectively). Although the PuO2 had a fair relation to serum c
reatinine in patients with a low cardiac index, there was no relation
to the cardiac index, In patients with increases in PuO2 from day 1 to
day 2, the cardiac index increased, and the serum creatinine level de
creased on the 2nd day, whereas a sustained decrease in cardiac index
and an increase in serum creatinine were observed in patients with a d
ecrease in PuO2 from day 1 to day 2. Thus, PuO2 can be used as an indi
cator of the renal function in patients with ischemic heart disease.