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  • Title: Comparative renal pathophysiology relevant to IDDM and NIDDM patients.
    Author: Mogensen CE, Schmitz A, Christensen CK.
    Journal: Diabetes Metab Rev; 1988 Aug; 4(5):453-83. PubMed ID: 3061756.
    Abstract:
    Hyperfiltration is a very characteristic feature in insulin-dependent diabetes. Hyperfiltration is to some extent associated with long-term glycemic control but the correlation is not very strong. Long-term hyperfiltration may play a role in the genesis of late diabetic nephropathy, but it is difficult to distinguish effects of hyperfiltration per se from effects of poor metabolic control. Long-term hyperfiltration without diabetes does not produce nephropathy. It is hypothesized that IDDM patients who do not show considerable hyperfiltration in spite of poor metabolic control may be those who are to some extent protected against late diabetic nephropathy, but other mechanisms may also be involved in the renal protection of these patients, who survive long-term diabetes without nephropathy. On the other hand, those with poor metabolic control combined with hyperfiltration are likely to develop nephropathy. In addition, it is suggested that the metabolic aberrations in diabetes, with the subsequent changes in the biochemistry of the glomerular wall, are permissive and absolutely required for the development of diabetic nephropathy. Of note, diabetic glomerulopathy in NIDDM occurs without significant hyperfiltration and extreme hyperfiltration in the one-kidney-model (without diabetes) does not produce nephropathy. Nonglycemic modalities of intervention, resulting in reduced hyperfiltration, e.g., low-protein diet or administration of somatostatin analogues, deserves interest as new potential ways of preventing or postponing diabetic nephropathy. Also intervention with aldose-reductase inhibitors may be an important therapeutic modality for those patients in whom good metabolic control is not obtainable. It is now well-established that antihypertensive treatment, including ACE-inhibition, reduces rate of decline in GFR in patients with already established nephropathy. In addition, protein excretion is diminished in IDDM patients with incipient diabetic nephropathy by antihypertensive treatment where GFR is well-preserved during treatment. No data are available for NIDDM.
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