Using different equations for estimating glomerular filtration rate in patients with type 1 diabetes


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Aim. To compare different methods of estimating GFR calculated by creatinine and cystatin С in patients with type 1 diabetes with normal and moderately decreased renal filtration function. Material and methods. The study involved 57 patients with type 1 diabetes, 37 men and 20 women, aged from 21 to 57 years (median ЗО years), with disease duration after diagnosis from 33 to 2 years (median 8 years). The control group comprised 15 non-diabetic people aged 19 to 42 years (median - 28 years), with normal levels of abuminuria and blood creatinine. The majority of patients with type 1 diabetes were found to have decompensated diabetes mellitus. The mean value of glycated hemoglobin in patients was 8%. The renal glomerular function was estimated by level of GFR and triple testing of urine albumin excretion. Renal tubular function in type 1 diabetes was tested by examining serum cystatin С. Results. GFR estimating equations, which did not include serum of cystatin С produced higher GFR. As a result, the majority of patients had normal or elevated GFR showing hyperfiltration. Using cystatin-C-based equations resulted in a several-fold reduction in the number of patients with hyperfiltration and increased number of cases with GFR below 90 ml/min/m2. The assessment of the relationship between SDMA and GFR showed negative correlation with both cystatin-C-based and creatinine-based equations. Conclusion. These findings revealed that GFR estimating equations based on both creatinine and cystatin С produce more accurate results compared with the reference estimating equations.

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