Effect of diabetes on renal medullary oxygenation during water diuresis.
OBJECTIVE
To study the effect of water diuresis on renal medullary and cortical oxygenation in patients with diabetes using blood oxygenation level--dependent magnetic resonance imaging (BOLD MRI).


METHODS
Nine mild diabetic subjects (48 +/- 2.7 years of age, six women) and nine nondiabetic subjects of similar age and sex, all without known vascular or renal disease, were studied noninvasively by MRI before and during water diuresis.


RESULTS
Water diuresis induced an increase in medullary oxygenation in control subjects, producing a decrease in R2* (apparent spin-spin relaxation time) of 1.89 +/- 0.27 (P < 0.01), but no significant change in the group of diabetic subjects.


CONCLUSIONS
These findings in middle-aged diabetic subjects, which resembled those previously described in elderly subjects >65 years of age, suggest early impairment of adaptive vasodilatation within the renal medulla in diabetes.
Epstein
Franklin H
FH
Department of Medicine, Beth Israel Deaconess Medical Center, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts 02215, USA. fepstein@caregroup.harvard.edu
Veves
Aristidis
A
Prasad
Pottumarthi V
PV
D000328:Adult; D000368:Aged; D001794:Blood Pressure; D001827:Body Height; D001835:Body Weight; D003404:Creatinine / Q000378:metabolism; D003920:Diabetes Mellitus / Q000503:physiopathology*; D004231:Diuresis / Q000502:physiology*; D005260:Female; D006801:Humans; D007679:Kidney Medulla / Q000378:metabolism / Q000502:physiology / Q000503:physiopathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D012016:Reference Values; D014867:Water
D014867:Water; D003404:Creatinine