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Diabetes Care, Vol 21, Issue 1 116-120, Copyright © 1998 by American Diabetes Association
Role of glycemic control and blood pressure in the development and progression of nephropathy in elderly Japanese NIDDM patients
Y Tanaka, Y Atsumi, K Matsuoka, T Onuma, T Tohjima and R Kawamori
Department of Medicine, Metabolism, and Endocrinology, Juntendo University, Tokyo, Japan.
OBJECTIVE: To investigate the role of glycemic control and blood pressure
in the development and progression of nephropathy and to suggest goals for
glycemic control and blood pressure for the prevention of nephropathy in
elderly Japanese NIDDM patients. RESEARCH DESIGN AND METHODS: A total of
123 age- and diabetes duration-matched elderly Japanese NIDDM patients
(aged 60-75 years; 74 normoalbuminuric and 49 microalbuminuric) were
retrospectively studied for 6 years. RESULTS: The group that developed
microalbuminuria from normoalbuminuria (group NM: n = 24) showed a higher
6-year mean HbA1c than the group that remained normoalbuminuric (group NN:
n = 50; 9.0 +/- 0.8 vs. 8.1 +/- 0.8%, P < 0.01) in spite of no
significant difference in 6-year mean blood pressure (MBP). On the other
hand, the group that progressed from microalbuminuria to overt proteinuria
(group MP: n = 26) showed a higher 6-year MBP than the group that remained
microalbuminuric (group MM: n = 23; 106 +/- 5 vs. 95 +/- 6 mmHg, P <
0.01) in spite of no significant difference in 6-year mean HbA1c. The
cutoff level of HbA1c separating group NN from group NM was 8.5% (normal
range < or = 6.5%), and that of MBP separating group MM from group MP
was 100 mmHg. CONCLUSIONS: Glycemic control is a more potent factor than
blood pressure level on the development of microalbuminuria. However, as
far as the progression of microalbuminuria to overt proteinuria is
concerned, hypertension is the most crucial factor in elderly NIDDM
patients. Suggested goals for glycemic control and blood pressure level for
the prevention of nephropathy in elderly Japanese patients are an HbA1c of
< or = 8.5% (equivalent to 7.8% in the current measurement of stable
HbA1c; normal range < or = 5.8%) and an MBP of < or = 100 mmHg.

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Copyright © 1998 by the American Diabetes Association.
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