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Related Experiment Videos

Autoimmune insulin syndrome.

F Archambeaud-Mouveroux1, M C Huc, S Nadalon

  • 1Service de Médecine Interne B-Endocrinologie, CHU, Limoges, France.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|January 1, 1989
PubMed
Summary
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Autoimmune insulin syndrome, characterized by anti-insulin antibodies, causes hypoglycemia in patients without prior insulin use. Diagnosis involves discordant insulin and C-peptide levels, differentiating it from insulinoma and factitious hypoglycemia.

Area of Science:

  • Endocrinology
  • Immunology
  • Internal Medicine

Background:

  • Autoimmune insulin syndrome (AIS) is a rare condition initially described in Japan.
  • It manifests as spontaneous or reactive hypoglycemia with elevated immuno-reactive insulin levels.
  • AIS is caused by autoantibodies against endogenous insulin in patients never treated with exogenous insulin.

Purpose of the Study:

  • To elucidate the diagnostic challenges and clinical characteristics of autoimmune insulin syndrome.
  • To differentiate AIS from other causes of hypoglycemia, such as insulinoma and factitious hypoglycemia.
  • To explore potential etiologies and associations of AIS.

Main Methods:

  • Analysis of clinical presentations, laboratory findings, and diagnostic discordances.

Related Experiment Videos

  • Measurement of total immuno-reactive insulin and C-peptide levels.
  • Assessment of anti-insulin antibody presence and levels.

    • Main Results:

    • Discordance between insulin and C-peptide levels suggests anti-insulin antibodies, aiding diagnosis and preventing misdiagnosis of insulinoma.
    • AIS can be challenging to distinguish from factitious hypoglycemia.
    • The syndrome typically shows a favorable prognosis with spontaneous reduction in anti-insulin antibody levels.

    Conclusions:

    • Autoimmune insulin syndrome presents a unique diagnostic challenge, requiring careful evaluation of insulin and C-peptide levels.
    • While the exact mechanisms remain unclear, associations with other autoimmune diseases suggest a shared immune dysfunction.
    • Drugs containing sulfhydryl groups are potential etiological factors in AIS.