Effect of Diabetes on Renal Medullary Oxygenation During Water Diuresis
- Franklin H. Epstein, MD1,
- Aristidis Veves, MD1 and
- Pottumarthi V. Prasad, PHD2
- 1Department of Medicine, Beth Israel Deaconess Medical Center, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
- 2Department of Radiology, Beth Israel Deaconess Medical Center, Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts
Abstract
OBJECTIVES—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).
RESEARCH DESIGN AND 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.
- BOLD, blood oxygenation level dependent
- MRI, magnetic resonance imaging
- NO, nitric oxide
- PGE2, prostaglandin E2
Footnotes
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Address correspondence and reprint requests to Dr. F. H. Epstein, Beth Israel Deaconess Medical Center East, 330 Brookline Ave., Dana 517, Boston, MA 02215. E-mail: fepstein{at}caregroup.harvard.edu.
Received for publication 21 May 2001 and accepted in revised form 4 September 2001.
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