alexa The changing natural history of nephropathy in type I diabetes.
Nephrology

Nephrology

Journal of Nephrology & Therapeutics

Author(s): Krolewski AS, Warram JH, Christlieb AR, Busick EJ, Kahn CR

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Abstract Events in the natural history of diabetic nephropathy (including the onset of persistent proteinuria and end-stage renal failure) were studied in a cohort of 292 patients with juvenile-onset type I diabetes who were followed for 20 to 40 years. The risk of persistent proteinuria increased rapidly between the fifth and 15th years of diabetes and declined thereafter. This pattern suggests that susceptibility to this complication was limited to a subset of patients and was exhausted over time. Patients with the most frequent severe hyperglycemia (the highest quartile) during the first 15 years of diabetes had a risk of persistent proteinuria that was four and a half times higher than that for those with the least frequent hyperglycemia (the lowest quartile). Patients whose diabetes was diagnosed in the 1930s had twice the risk of persistent proteinuria as those in whom the condition was diagnosed in later decades. Once persistent proteinuria appeared, progression to renal failure almost always followed. Half reached this stage within 10 years, and the interval for progression did not vary according to sex, frequency of hyperglycemia, or calendar year of diagnosis of diabetes. This period, however, was significantly shorter (eight versus 14 years) for patients whose diabetes was diagnosed after puberty than for those who were younger at onset. In conclusion, the development of diabetic nephropathy consists of at least two stages. The onset of proteinuria, although related to the level of exposure to hyperglycemia, appears to be influenced by genetic and/or environmental factors. The second stage, progression to renal failure, seems to be influenced by processes related to maturation or aging.
This article was published in Am J Med and referenced in Journal of Nephrology & Therapeutics

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