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Fulminant type 1 diabetes as a high risk group for diabetic microangiopathy--a nationwide 5-year-study in Japan
Y Murase1, A Imagawa, T Hanafusa
1First Department of Internal Medicine, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki, and Department of Metabolism/Diabetes and Clinical Nutrition, Nagasaki University Hospital of Medicine and Dentistry, Japan.
Insights
Fulminant type 1 diabetes patients show a significantly higher risk of developing microangiopathy compared to type 1A diabetes. This increased risk is linked to a lack of endogenous insulin secretion from diagnosis.
Area of Science:
- Endocrinology
- Diabetology
- Nephrology
Background:
- Fulminant type 1 diabetes is a novel subtype of type 1B diabetes.
- Understanding its long-term complications is crucial.
Purpose of the Study:
- To assess the development of microangiopathy in patients with fulminant type 1 diabetes.
- To compare microangiopathy incidence with type 1A diabetes.
Main Methods:
- Nationwide survey following 41 fulminant type 1 diabetes and 76 type 1A diabetes patients for 5 years.
- Regular monitoring of glucose, HbA1c, albuminuria, C-peptide, blood pressure, insulin dosage, hypoglycemia, and clinical examinations.
Main Results:
- 5-year microangiopathy incidence was 24.4% in fulminant type 1 diabetes vs. 2.6% in type 1A diabetes.
- Higher rates of retinopathy, nephropathy, and neuropathy in fulminant type 1 diabetes.
- Similar HbA1c but higher insulin needs and hypoglycemia, with lower C-peptide in fulminant type 1 diabetes.
Conclusions:
- Fulminant type 1 diabetes patients are a high-risk subgroup for diabetic microangiopathy.
- Lack of endogenous insulin secretion from onset contributes to microangiopathy risk.
Aims/Hypothesis:
The aim of the present study was to assess the development of microangiopathy in patients with fulminant type 1 diabetes, a novel subtype of type 1B diabetes.
Materials And Methods:
In a nationwide survey, we followed 41 patients with fulminant type 1 diabetes and 76 age- and sex-matched patients with type 1A diabetes for 5 years. The following data were recorded every 12 months after the onset of diabetes: seven-point blood glucose concentrations, HbA1c level, urinary albumin excretion, serum C-peptide level, blood pressure, daily dosages of insulin, frequency of severe hypoglycaemic episodes, and neurological and fundoscopic examination.
Results:
The 5-year cumulative incidence of microangiopathy was 24.4% in fulminant type 1 diabetes and 2.6% in type 1A diabetes. In longitudinal studies using the Kaplan-Meier method, the cumulative incidence of each form of microangiopathy was significantly higher in fulminant type 1 diabetes than in type 1A diabetes; retinopathy was 9.8% vs 0% (p=0.014), nephropathy 12.2% vs 2.6% (p=0.015) and neuropathy 12.2% vs 1.3% (p=0.010), respectively. Mean HbA1c levels were similar in the fulminant and type 1A diabetes groups during the follow-up periods. However, the mean M-value, mean insulin dosages and the frequency of severe hypoglycaemic episodes were significantly higher, and the mean postprandial C-peptide level was significantly lower in the fulminant type 1 diabetes group.
Conclusions/Interpretation:
These data suggest that patients with fulminant type 1 diabetes are a high-risk subgroup for diabetic microangiopathy associated with the lack of endogenous insulin secretion from the onset of diabetes.
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