Recurrent Insulin Autoimmune Syndrome Caused by alpha-Lipoic Acid in Type 2 Diabetes

Insulin autoimmune syndrome (IAS) is characterized by spontaneous hypoglycemia caused by insulin autoantibodies in the absence of exogenous insulin administration. Some drugs containing sulfhydryl compounds are known to initiate the onset of IAS. A 67-year-old female who had diabetes for 5 years visited the outpatient clinic at our institution due to diabetic peripheral polyneuropathy. She was prescribed alpha-lipoic acid (ALA), which contains two sulfur atoms. Two weeks later, she complained of recurrent hypoglycemic symptoms. We detected a high level of insulin and high titers of insulin autoantibodies. Her human leukocyte antigen (HLA) genotype included the DRB1*0406 allele, which indicates a high level of susceptibility to IAS. She was treated with prednisolone. After this episode, she experienced two more hypoglycemic events after taking ALA for diabetic neuropathy in other hospitals. As ALA can be used to treat diabetic peripheral polyneuropathy, physician discretion is advised based on the possibility of IAS due to ALA in diabetic patients.

Recurrent Insulin Autoimmune Syndrome Caused by alpha-Lipoic Acid in Type 2 Diabetes

Insulin autoimmune syndrome (IAS) is characterized by spontaneous hypoglycemia caused by insulin autoantibodies in the absence of exogenous insulin administration. Some drugs containing sulfhydryl compounds are known to initiate the onset of IAS. A 67-year-old female who had diabetes for 5 years visited the outpatient clinic at our institution due to diabetic peripheral polyneuropathy. She was prescribed alpha-lipoic acid (ALA), which contains two sulfur atoms. Two weeks later, she complained of recurrent hypoglycemic symptoms. We detected a high level of insulin and high titers of insulin autoantibodies. Her human leukocyte antigen (HLA) genotype included the DRB1*0406 allele, which indicates a high level of susceptibility to IAS. She was treated with prednisolone. After this episode, she experienced two more hypoglycemic events after taking ALA for diabetic neuropathy in other hospitals. As ALA can be used to treat diabetic peripheral polyneuropathy, physician discretion is advised based on the possibility of IAS due to ALA in diabetic patients.

Factors related to prevalence of colonic polyps in acromegalic patients / 대한내과학회지

BACKGROUND: It has been suggested that acromegalic patients are at increased risk of developing colonic neoplasia. We evaluated the prevalence of colonic neoplasia and the relationships of clinical parameters of acromegalic activity with presence of colonic neoplasia in Korean acromegalic patients. METHODS: In 30 patients with active acromegaly, colonoscopy was performed at the time of diagnosis. According to the endoscopic findings and histological classifications, the patients were grouped, and a number of clinical parameters of acromegalic activity were compared between those with and without colonic polyps. RESULTS: Colonic polyps were detected in 17 (56.7%) in the 30 acromegalic patients with colonoscopic examinations; 7 (23.3%) hyperplastic and 10 (33.3%) adenomatous polyps. Those with colonic polyps were significantly older (52.2+/-9.46 years vs. 42.2+/-12.97 years, p=0.02) and also had significantly longer disease duration (11.8+/-7.52 years vs. 5+/-2.20 years, p=0.004) than those without ones. In 21 patients who were more than 40 years old, significant differences were found in disease duration (12.7+/-7.54 years vs. 5.0+/-2.68 years, p=0.026) and serum IGF-1 level (1311.9+/-500.14 ng/mL vs. 715.9+/-330.58 ng/mL, p=0.015) between those with and without colonic polyps. CONCLUSION: These results suggest that screening colonoscopy should be recommended in acromegalic patients who are more than 40 year-old, have long disease duration or have high serum IGF-1 level.

A Case of Acute Adrenal Insufficiency with Bilateral Adrenal Hemorrhagic Infarction due to Ebstein-Barr Virus Infection in a Patient with Asymptomatic Chronic Adrenal Insufficiency / 대한내분비학회지

Acute adrenal insufficiency may result from adrenal crisis, hemorrhagic destruction, or the rapid withdrawal of steroids from patient with chronic steroid medication, congenital adrenal hyperplasia or those on other drugs. Acute hemorrhagic destruction of both adrenal glands can occur due to infection, trauma, anticoagulant therapy, antiphospholipid syndrome or a coagulation disorder. However, there have been no reports on acute hemorrhagic adrenal insufficiency due to the Ebstein-Barr virus (EBV). Herein, a case of acute adrenal insufficiency, with bilateral adrenal hemorrhagic infarction, is reported in a patient with asymptomatic chronic adrenal insufficiency. A 42-year-old man presented with general weakness, weight loss and hyperpigmentation of several months duration. He suffered from a sore throat, general myalgia and a headache on admission. The laboratory findings were lymphocytosis, positive EBV IgM antibody, low cortisol level and a high level of adrenocorticotropic hormone (ACTH). Adrenocortical autoantibody and PCR for Mycobacterium tuberculosis showed negative findings. The serologic findings for CMV and HIV were negative. Fine needle aspiration of the adrenal gland revealed a hemorrhagic infarction and positive staining for the anti-EBV antibody. Acute adrenal insufficiency was then diagnosed with a bilateral adrenal hemorrhagic infarction due to the EBV infection in the patient, also with asymptomatic chronic adrenal insufficiency. This is the first case of acute adrenal insufficiency with bilateral hemorrhagic infarction, due to an EBV infection

Two Cases of Autoimmune Insulin Syndrome with Hypoglycemia / 대한내분비학회지

Autoimmune insulin syndrome is characterized by insulin autoantibody, hyperinsulinemia, and fasting hypoglycemia without previous insulin immunization. This syndrome shows discordant levels between immunoreactive insulin and C-peptide. Negative results of an anatomic study of the pancreas and an inability to reproduce hypoglycemia during a prolonged fast may be helpful in excluding insulinoma. Symptomatic hypoglycemia usually develops during an oral glucose tolerance test. This syndrome is a self-limited disorder. Recently, we experienced one case that developed symptomatic hypoglycemia during both the fasting & oral glucose tolerance test, and another that developed symptomatic hypoglycemia during the oral glucose tolerance test but not the fasting test. Hereby, we present these cases with a review of the literature.