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Significance of microalbuminuria in long-duration type 1 diabetes

Chankramath S Arun1, James Stoddart, Paul Mackin

  • 1Department of Medicine, The Medical School, University of Newcastle, Newcastle Upon Tyne, UK. csarun@lineone.net

Diabetes Care
|July 2, 2003
PubMed
Abstract

Insights

Microalbuminuria (MA) and proteinuria predict premature death in long-standing type 1 diabetes. Even with diabetes over 30 years, abnormal albumin excretion indicates higher mortality risk and predicts worsening kidney disease.

Area of Science:

  • Nephrology
  • Endocrinology
  • Diabetology

Background:

  • The prognostic value of microalbuminuria (MA) for renal disease and mortality in long-duration type 1 diabetes remains uncertain.
  • Type 1 diabetes exceeding 30 years of duration presents unique challenges in predicting long-term complications.

Purpose of the Study:

  • To evaluate the predictive value of microalbuminuria (MA) and proteinuria for all-cause mortality in patients with type 1 diabetes of over 30 years' duration.
  • To assess the association between abnormal albuminuria and the progression to persistent proteinuria.

Main Methods:

  • A prospective cohort study followed 135 patients with type 1 diabetes (>30 years duration) for 7 years.
  • Albuminuria levels, clinical variables, vital status, and cause of death were recorded throughout the follow-up period.

Main Results:

  • Twenty percent (27/135) of patients died during follow-up. Patients with MA or proteinuria at baseline had significantly higher mortality rates compared to normoalbuminuric patients.
  • Abnormal albumin excretion and low BMI were independent predictors of premature death. Causes of death were similar across albuminuria groups.
  • Among survivors, 24.4% of normoalbuminuric individuals developed MA, and 3.5% developed persistent proteinuria. Baseline MA predicted progression to persistent proteinuria.

Conclusions:

  • Microalbuminuria and proteinuria are significant predictors of all-cause mortality, even in long-standing type 1 diabetes (>30 years).
  • Microalbuminuria serves as a reliable indicator for predicting the development of persistent proteinuria in this patient population.

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