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  • Title: Glucose control, diabetic retinopathy, and hemodialysis induction in subjects with normo-microalbuminuric type 2 diabetic patients with normal renal function followed for 15 years.
    Author: Moriya T, Hayashi A, Matsubara M, Suzuki A, Ouchi M.
    Journal: J Diabetes Complications; 2022 Jan; 36(1):108080. PubMed ID: 34740544.
    Abstract:
    AIMS: A high urinary albumin excretion (UAE) and low glomerular filtration rate (GFR) are risk factors for progressive renal function loss in type 2 diabetic patients. In addition, diabetic retinopathy (DR) is also a risk factor for progressive renal function decline in microalbuminuric type 2 diabetic patients. We aimed to elucidate the factors, including DR, associated with a more severe situation of diabetic nephropathy, i.e., hemodialysis (HD) induction in normo- and microalbuminuric type 2 diabetic patients without renal dysfunction. METHODS: Normo- and microalbuminuric type 2 diabetic patients with normal renal function whose GFRs had been measured by iohexol injection in 1995-1997 and had been followed for over 5 years were analyzed (n = 199). HbA1c levels was divided into HbA1c ≥ 7.0 (n = 146) and <7.0 (n = 53) groups. The UAE levels were classified as normoalbuminuria (NA, n = 114) and microalbuminuria (MA, n = 85). Seventy-two patients had DR, and 96 had hypertension. Patients were followed up for 15.7 ± 6.0 years and frequency of and duration to the HD induction were evaluated. RESULTS: During the study period, 8 patients received HD induction. There were no remarkable differences in the rates of HD induction between patients with and without HbA1c ≥7.0, microalbuminuria, DR or hypertension. A Kaplan-Meier analysis revealed that HbA1c ≥7.0 (p = 0.037) and DR (p = 0.037) were associated with a significantly higher risk of HD induction than HbA1c <7.0 and no DR, respectively while albuminuria grade and hypertension were not associated with the risk of HD induction. There was significant negative correlation between HbA1c and annual decline rate of eGFR and annual decline rate of eGFR in the patients with prepro-proliferative DR (PDR) was significantly higher than that in the patients without DR. In the multivariate analysis, HbA1c and PDR showed significant relationships with the annual decline rate of eGFR. CONCLUSIONS: It was reasonable that poorer glycemic control affected HD induction for 16 years follow-up. However, DR, especially PDR, should also be considered a substantial risk factor for HD induction although microalbuminuria and hypertension did not predict it at the early stage of diabetic nephropathy in type 2 diabetic patients with normal renal function.
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