Impact of Hypoglycemia Unawareness on Brain Metabolism Cognition in T1DM
|First Received Date ICMJE||December 14, 2007|
|Last Updated Date||January 25, 2012|
|Start Date ICMJE||August 2005|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00575783 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Impact of Hypoglycemia Unawareness on Brain Metabolism Cognition in T1DM|
|Official Title ICMJE||Impact of Hypoglycemia Unawareness on Brain Metabolism Cognition in T1DM|
The research study is designed to examine the impact of low blood sugar on brain function in individuals with Type 1 Diabetes who have frequent and severe hypoglycemia (low blood sugar) compared to those who do not.
During the course of treating diabetes (for example, after an insulin injection), blood sugar levels will sometimes drop too low. This condition is known as hypoglycemia. Normally, a healthy body responds to hypoglycemia by producing a number of "anti-insulin" hormones which raise blood sugar levels. In addition, these hormones provide the individual with warning signals of hypoglycemia, including hunger, sweating, shaking and heart palpitations. These warning signals allow diabetics to correct low blood sugar levels by eating sugar tablets or by having a snack.
Unfortunately, and for unclear reasons, many people with longstanding diabetes lose their ability to recognize low blood sugar levels-a condition called "hypoglycemia unawareness." The brain, in particular, is extremely sensitive to hypoglycemia. Unable to sense and respond to low blood sugar levels, these individuals may experience a sudden onset of blurred vision, confusion, seizures, coma, or even death.
In recent years, a new technique called "islet cell transplantation" has been developed as an alternate means of treating insulin-dependent diabetes. Pancreatic islet cells (the cells that produce insulin), from human donors, are injected into the diabetic patient's liver where the cells are capable of making insulin and can regulate blood sugar levels without the need for insulin injections. Currently, this technique is used primarily in patients with severe hypoglycemia unawareness.
While it is known that islet cell transplantation can reduce the risk of severe hypoglycemia, the effects of transplantation on hypoglycemia unawareness are unknown. This study is designed to investigate why hypoglycemia unawareness happens and the impact it has on brain function in individuals with type 1 diabetes.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Observational Model: Case Control
Time Perspective: Cross-Sectional
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Non-Probability Sample|
Group 1A) T1DM subjects with severe hypoglycemia unawareness and awaiting islet cell transplantation will be referred by participating islet transplantation centers.
Group 1B) T1DM subjects with severe hypoglycemia unawareness but not awaiting islet cell transplantation will be from the greater New Haven, CT area.
Group 2)T1DM, not optimally controlled and without hypoglycemia unawareness will be from the greater New Haven, CT area.
Group 3) Non-Diabetics from the greater New Haven CT area.
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||
|Publications *||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Estimated Enrollment ICMJE||51|
|Completion Date||August 2008|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
Inclusion criteria for Group 1A:
Inclusion criteria for Group 1B:
Inclusion criteria for Group 2:
Group 1A: (T1DM subjects being considered for islet cell transplantation)
Group 1 B: (T1DM with Severe Hypoglycemia Unawareness not on the Transplant List)
Group 2: (T1DM control subjects)
Group 3: (Normal Controls)
|Ages||18 Years to 49 Years|
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00575783|
|Other Study ID Numbers ICMJE||DK72409 (completed), R01DK072409, HIC# 0505000077|
|Has Data Monitoring Committee||Yes|
|Responsible Party||Robert Sherwin, Yale University|
|Study Sponsor ICMJE||Yale University|
|Information Provided By||Yale University|
|Verification Date||January 2012|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP