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Evaluation of changes in intrarenal oxygenation in rats using multiple gradient-recalled echo (mGRE) sequence
A Priatna1, F H Epstein, K Spokes
1Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA.
Journal of Magnetic Resonance Imaging : JMRI
|June 18, 1999
Summary
This study shows that furosemide improves kidney oxygenation in rats, while acetazolamide does not. This magnetic resonance imaging technique may help evaluate treatments for acute renal failure.
Area of Science:
- Nephrology
- Medical Imaging
- Pharmacology
Background:
- Assessing intrarenal oxygenation is crucial for understanding kidney function and disease.
- Previous studies utilized oxygen microelectrodes, but advanced imaging techniques offer non-invasive alternatives.
Purpose of the Study:
- To evaluate changes in intrarenal oxygenation in rats using a multiple gradient-recalled echo (mGRE) sequence.
- To investigate the effects of specific diuretics on kidney oxygenation.
Main Methods:
- Utilized a multiple gradient-recalled echo (mGRE) magnetic resonance imaging sequence.
- Administered furosemide (a loop diuretic) and acetazolamide (a proximal tubular diuretic) to rats.
- Monitored changes in intrarenal oxygenation.
Main Results:
- Furosemide administration led to improved oxygenation in the renal medulla.
- Acetazolamide did not produce significant changes in intrarenal oxygenation.
- Results align with prior human studies and rat studies using oxygen microelectrodes.
Conclusions:
- The mGRE sequence is a viable tool for assessing intrarenal oxygenation changes in response to pharmacological stimuli in rats.
- This technique holds potential for evaluating therapeutic strategies in animal models of renal pathophysiology, including acute renal failure.