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Am J Case Rep ; 25: e943590, 2024 May 16.
Article in English | MEDLINE | ID: mdl-38751092

ABSTRACT

BACKGROUND Fulminant type 1 diabetes is characterized by a low prevalence of autoantibodies, and was originally described as a nonautoimmune subtype of type 1 diabetes. Herein, we report a case in which we observed the process of extremely rapid onset of diabetes and early decline in anti-glutamic acid decarboxylase (GAD) antibody titers during the inpatient stay. CASE REPORT A 61-year-old man was brought to our hospital with marked hyperglycemia (1327 mg/dL), ketonemia (3-hydroxybutyrate: 14 012 µmol/L), and moderately elevated HbA1c (7.2%) and glycoalbumin (22.3%). C-peptide levels were undetectable. He had suffered from thirst, polyuria, and fatigue for 2 days. Abrupt onset was proven by the clinical data when he visited the hospital with respiratory symptoms 6 days before his admission; plasma glucose, glycoalbumin, C-peptide, and insulin levels were 117 mg/dL, 13.0%, 5.07 ng/mL, and 24.4 µIU/mL, respectively. The anti-GAD antibody titer measured by enzyme-linked immunosorbent assay was 111 U/mL at admission, 22.8 U/mL 2 weeks after admission, and negative 1 year later. He had a susceptible haplotype DRB1*09: 01-DQB1*03: 03, which is significantly more common in anti-GAD antibody-positive patients with fulminant type 1 diabetes. CONCLUSIONS The early decline of anti-GAD antibody titer likely reflected rapid and complete beta cell loss. The sequential metabolic and immunological observation in this case may provide insight into the pathogenesis of fulminant type 1 diabetes.


Subject(s)
Autoantibodies , Diabetes Mellitus, Type 1 , Glutamate Decarboxylase , Humans , Male , Middle Aged , Glutamate Decarboxylase/immunology , Autoantibodies/blood
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