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Renal fibrosis in cyclosporin A-treated renal allograft recipients : morphological findings in relation to renal hemodynamics
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- Jacobson, S H (author)
- Karolinska Institutet
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- Jaremko, G (author)
- Karolinska Institutet
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- Duraj, Frans (author)
- Department of Medicine, Karolinska Hospital, Stockholm, Sweden
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- Wilczek, H E (author)
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- (creator_code:org_t)
- 1996
- 1996
- English.
- In: Transplant International. - 0934-0874 .- 1432-2277. ; 9:5, s. 492-498
- Journal article (peer-reviewed)
Abstract
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- Nineteen nondiabetic kidney graft patients treated with cyclosporin A for 2 years underwent percutaneous renal allograft biopsy as well as renal hemodynamic examination. Renal allograft fibrosis was quantitatively evaluated as the relative volume of the renal cortical interstitium (VV %) and as the interstitium/tubuli ratio (I/T ratio). The histological changes were then classified into four groups, depending on the degree of interstitial fibrosis. The glomerular filtration rate (GFR), renal plasma flow (RPF), renal blood flow (RBF), filtration fraction (FF), and fractional clearance of sodium, potassium, phosphate, chloride, osmoles, and free water clearance were determined in all patients and in 13 healthy controls. Kidney graft recipients had significantly lower GFR, lower RPF, and lower RBF than the healthy controls (P < 0.001 for all comparisons) while FF was similar in patients and controls. Transplant recipients had a significantly higher fractional excretion of sodium, potassium, chloride, and phosphate than controls. All except one patient had clearly increased VV values, indicating increased interstitial fibrosis. The mean VV in renal allograft patients was 35% ± 10% (normal < 16% ± 5%) and the I/T ratio was 1.07 ± 0.60 (normal < 0.24 ± 0.08). No correlation was found between the quantitative or semiquantitative biopsy analysis and any renal hemodynamic parameter measured. We conclude that renal function is significantly decreased in kidney graft recipients, but that adaptive tubular changes occur in the graft. Interstitial renal fibrosis was common but did not correlate to any renal functional parameter.
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