Severe nephrotic syndrome and early end-stage diabetic kidney disease in ABCC8-MODY12: A case report.

A 24-year-old man with diabetes mellitus presented with advanced kidney disease and severe proteinuria. Genetic testing revealed ABCC8-MODY12 (OMIM 600509), and a kidney biopsy showed nodular glomerulosclerosis. He commenced dialysis shortly thereafter, and glycemic control improved on treatment with a sulfonylurea. Diabetic end-stage kidney disease in patients with ABCC8-MODY12 has not been reported until now. Thus, our case highlights the risk for early-onset and severe diabetic kidney disease in patients with ABCC8-MODY12 and the importance of timely genetic diagnosis in unusual cases of diabetes to allow for proper treatment and prevention of late sequelae of diabetes.

Darbepoetin alfa once every 2 weeks effectively maintained hemoglobin in dialysis patients in an observational study: Austrian cohort of ALTERNATE.

ALTERNATE is an international observational study evaluating biweekly darbepoetin alfa (DA) in adult dialysis patients in clinical practice. Austrian ALTERNATE results are presented here (n = 505). The follow-up study ALTERNATE follow-up (AFU) followed Austrian ALTERNATE patients for an additional 12 months (n = 135). Data were collected 6 months before and 12 months after conversion to biweekly dosing and during 12 months of follow-up. The primary measures were hemoglobin concentration 12 months after conversion and at the end of AFU, respectively. Mean (95 % CI) hemoglobin (g/dL) was 11.87 (11.75-11.99) at conversion, 11.71 (11.58-11.83) at month 12, and 11.66 (11.45-11.86) at end of AFU. Geometric mean (95 % CI) weekly dose (µg/wk) was 32.97 (30.80-35.30) at conversion, 29.90 (26.71-33.46) 12 months after conversion, and 24.38 (18.40-30.35) at end of AFU. The studies show that hemoglobin and dose could be effectively maintained over an extended period of time after conversion from higher frequency erythropoiesis-stimulating agents to biweekly DA.

Effect of high dose folic acid therapy on hyperhomocysteinemia in hemodialysis patients: results of the Vienna multicenter study.

Homocysteine is associated with atherosclerosis and enhanced cardiovascular risk. In previous studies, treatment with folic acid up to 15 mg/d failed to correct hyperhomocysteinemia in the majority of end-stage renal disease patients. A dose of 30 or 60 mg of folic acid per day was compared with 15 mg/d in an attempt to normalize hyperhomocysteinemia in 150 hemodialysis patients. In a randomized, double-blind, multicenter study, 144 patients completed the 4-wk treatment period and 121 patients completed the 6-mo follow-up. Total homocysteine plasma levels were reduced by 32.1% (15 mg/d), 29. 9% (30 mg/d), or 37.8% (60 mg/d) with no significant differences found between the three treatment groups. Baseline total homocysteine plasma concentration was an independent predictor of the response to folic acid therapy (P = 0.0001), whereas the 5, 10-methylenetetrahydrofolate reductase polymorphisms (MTHFR 677C --> T and 1298A --> C) had no influence. Nevertheless, patients with the MTHFR 677TT genotype more frequently attained normal total homocysteine plasma levels than patients with the CC or CT genotype (P = 0.025). In response to 60 mg of folic acid per day, TT genotype patients had lower folate plasma levels compared to CC or CT genotype patients (P = 0.016). After completion of the 4-wk treatment period with 30 or 60 mg of folic acid per day, there was a marked rebound of total homocysteine plasma levels at the end of the follow-up in patients with the MTHFR 677TT genotype, which even exceeded baseline values in several patients (P = 0.0001). This study clearly demonstrates that doses of 30 or 60 mg of folic acid per day are not more effective than 15 mg/d in reducing hyperhomocysteinemia in regular hemodialysis patients. Patients with the MTHFR 677TT genotype are more likely to realize normal total homocysteine plasma levels. Folic acid at 30 or 60 mg/d but not 15 mg/d results in a rebound of total homocysteine plasma concentrations when treatment is stopped.