Mechanism Underlying Beta-cell Failure in Obese African Americans With History of Hyperglycemic Crises

Diabetes Mellitus, Type 2 Clinical Trial

Official title:

Mechanism Underlying Beta-cell Failure in Obese African Americans With History of Hyperglycemic Crises

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00753142
• Other study ID #: 898-2003
• Status: Completed
• Phase: N/A
• Start date: March 2004
• Est. completion date: December 2009

Study information

• Verified date: September 2018
• Source: Emory University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Obesity is common in African American (AA) patients with newly diagnosed diabetes who present with diabetic ketoacidosis (DKA). Despite the presentation with severe symptoms of insulinopenia and ketoacidosis, clinical and immunogenetic observations indicate that most obese AA patients with DKA have type 2 diabetes. In such patients, previous studies reveal that: a) at presentation, obese AA patients with DKA have markedly decreased pancreatic insulin secretion, lower than in obese non-DKA patients admitted with comparable hyperglycemia, but significantly greater than in lean patients with DKA; b) aggressive diabetic management results in significant improvement in beta-cell function and insulin sensitivity sufficient to allow discontinuation of insulin therapy within 3 months of follow-up. Based on these observations the researchers conclude that similar to obese patients with hyperglycemia, most obese AA with DKA have type 2 diabetes, and that although defects in both insulin secretion and insulin action are present, transient b-cell failure is the primary defect in the development of ketoacidosis.

Description:

Obese AA patients with a history of DKA who later experience near-normoglycemia remission represent an ideal population in which to define the sequence of events that lead to b-cell dysfunction in type 2 diabetes. The researchers hypothesize that obese AA with DKA will prove particularly susceptible to beta-cells dysfunction due to sustained elevations of plasma glucose (glucose toxicity) and/or free fatty acid levels (lipotoxicity). This study will test beta-cell response by administering a glucose infusion to diabetic African Americans with a history of DKA, diabetic African Americans without a history of DKA, and non-diabetic African Americans.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 28
• Est. completion date: December 2009
• Est. primary completion date: December 2009
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 65 Years

Eligibility

Inclusion Criteria:

• Obese African American subjects (body mass index (BMI) equal or greater than 30)

• Age 18-65

• Patients with a history of diabetic ketoacidosis as defined by the American Diabetes Association (ADA) criteria

• Patients admitted with hyperglycemia but without ketoacidosis (blood glucose greater than 400ml/dl without evidence of ketosis/ketones

• Obese nondiabetic controls (BMI >30; ruled out for diabetes with a 75g oral glucose tolerance test)

Exclusion Criteria:

• Patients with positive autoimmune markers (islet cell or glutamic acid decarboxylase (GAD) autoantibodies)

• Patients with significant medical or surgical illness, including but not limited to myocardial ischemia, congestive heart failure, chronic renal insufficiency, liver failure, and infectious processes

• Patients with recognized or suspected endocrine disorders associated with increased insulin resistance, such as hypercortisolism, acromegaly, or hyperthyroidism

• Patients with bleeding disorders, thrombocytopenia, or abnormalities in coagulation studies

• Patients with fasting hyperglycemia (blood glucose > 120 mg/dl) after discontinuation of insulin therapy

• Pregnancy

Related Conditions & MeSH terms

• Diabetes Mellitus
• Diabetes Mellitus, Type 2

Intervention

Drug:
• Intralipid 20%
Participants receive a 48-hour infusion with Intralipid at 40 milliliters per hour (mL/hr).
• Glucose infusion
Participants receive a glucose infusion consisting of 10% dextrose infused intravenously at a rate of 200 mg/m^2/min for 20 hours.

Locations

Country	Name	City	State
United States	Grady Memorial Hospital	Atlanta	Georgia

Sponsors (2)

Lead Sponsor	Collaborator
Emory University	American Diabetes Association

Country where clinical trial is conducted

United States, 

References & Publications (1)

Gosmanov AR, Smiley D, Robalino G, Siqueira JM, Peng L, Kitabchi AE, Umpierrez GE. Effects of intravenous glucose load on insulin secretion in patients with ketosis-prone diabetes during near-normoglycemia remission. Diabetes Care. 2010 Apr;33(4):854-60. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	First-Phase Insulin Release (FPIR)	An arginine stimulation test was used to evaluate beta-cell function and insulin secretion. Increased glucose in the blood causes insulin to be released, beginning with a spike in insulin in the first 10 minutes and plateauing 2 to 3 later. Diminished first-phase insulin release is an early indicator of beta-cell dysfunction. Two sequential arginine stimulation tests were performed, the first set before and the second after completion of the 20-hour dextrose infusion. The first-phase insulin release (FPIR) was calculated as the sum of the insulin levels at 2, 3, 4, and 5 minutes after the arginine infusion. FPIR is expected to rise after the dextrose (glucose) infusion and FPIR generally rises less in persons with impaired glucose tolerance.	Hour 0, Hour 20
Secondary	Number of Participants With Beta-cell Failure	Pancreatic beta-cells can adapt to insulin resistance during the early stages of diabetes but continuous exposure of beta-cells to prolonged hyperglycemia can cause irreversible damage due to glucotoxicity. This study aimed to evaluate whether hyperglycemia-induced reduced beta-cell failure was the result of beta-cell exhaustion or beta-cell desensitization, however, no participants experienced beta-cell failure so this original analysis could not be performed.	Hour 20