Renal function in long-duration type I diabetes.
OBJECTIVE
The development of persistent proteinuria is reported to be uncommon after 30 years of type I diabetes, and the significance of microalbuminuria in patients with long-duration diabetes is unclear. We therefore undertook to study, in detail, renal function in patients with long-duration type I diabetes.


METHODS
We measured albumin excretion rate (AER), glomerular filtration rate (GFR), and serum creatinine in 140 patients with > or = 30 years of type I diabetes. We also assessed patients for other micro- macrovascular complications of diabetes together with factors implicated in the development of diabetic renal disease.


RESULTS
Of the patients, 23% had microalbuminuria (AER 20-200 micrograms/min and/or urinary albumin-to-creatinine ratio [ACR] > 2.5 mg/mmol [men] or > 3.5 mg/mmol [women] and dipstick negative for proteinuria), 4% had overt nephropathy (AER > 200 micrograms/min or persistent dipstick positive proteinuria), and 73% were normoalbuminuric (AER < 20 micrograms/min or ACR < 2.5 mg/mmol [men], < 3.5 mg/mmol [women]). Patients with microalbuminuria had lower GFR (81.5 +/- 30.2 vs. 96.0 +/- 20.3 ml.min-1.1.73 m-2; P = 0.06) and higher serum creatinine (104 +/- 32 vs. 92 +/- 16 mumol/l; P = 0.06) than those patients with normoalbuminuria. Both serum creatinine (P < 0.05) and tobacco consumption (P = 0.01) were significantly and independently related to elevated albumin excretion.


CONCLUSIONS
A substantial proportion of these patients have microalbuminuria and evidence of impaired renal function, suggesting that progression to end-stage renal failure may still be inevitable. Clinicians should continue to monitor renal function in these patients. The relationship between tobacco consumption and nephropathy also makes clear the need to reduce cigarette smoking in the diabetic population.
Mackin
P
P
Department of Medicine, University of Newcastle, Newcastle Upon Tyne, U.K.
Macleod
J M
JM
New
J P
JP
Marshall
S M
SM
D000328:Adult; D000419:Albuminuria; D002784:Cholesterol / Q000097:blood; D003404:Creatinine / Q000097:blood; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000503:physiopathology*; D003928:Diabetic Nephropathies / Q000097:blood / Q000503:physiopathology*; D005260:Female; D005919:Glomerular Filtration Rate; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007668:Kidney / Q000503:physiopathology*; D007677:Kidney Function Tests; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013997:Time Factors; D014280:Triglycerides / Q000097:blood
D002784:Cholesterol; D003404:Creatinine; D006442:Glycated Hemoglobin; D014280:Triglycerides