Measurement of Glucose Homeostasis in Human Brain by NMR: Effect of Recurrent Hypoglycemia on Type 1 Diabetes (Aim 1)


This study will explore the cerebral mechanisms of impaired awareness of hypoglycemia (IAH) in type 1 diabetics (T1D) following exposure to experimental recurrent hypoglycemia (HG). To induce IAH, patients with T1D identified to have normal awareness of hypoglycemia (NAH) will undergo three 2-hour long hypoglycemic clamps. Neurochemical profiles will be measured by high field MRS before and after induction of IAH at a fourth clamp. Participant glycemic variability for ~2 weeks and activity/sleep for ~1 week before the induction of IAH will be monitored as these factors have been shown to alter responses to HG.

I'm interested

18 Years to 65 Years old
This study is NOT accepting healthy volunteers
Inclusion Criteria:

• Type 1 diabetes diagnosed on clinical or laboratory grounds
• Diabetes duration 2 - 30 years
• Hemoglobin A1C <8.5%
Exclusion Criteria:

• Impaired awareness of hypoglycemia as determined by the Cox and Gold questionnaires
• Pregnant or plan to become pregnant during the study period
• Uncontrolled hypertension (blood pressure > 145/95 mmHg at screening)
• Evidence of autonomic neuropathy (presence of orthostatic hypotension or history of gastroparesis)
• Proliferative retinopathy
• Impaired kidney function (GFR < 45)
• History of myocardial infarction, stroke, seizures, neurosurgical procedures, major depression requiring hospitalization within the last 5 years, arrhythmias
• Current substance abuse
• Use of drugs that can alter glucose metabolism including but not limited to glucocorticoids and niacin, and excluding insulin and glucose lowering drugs used to treat diabetes, as determined by a clinician
• Inability to undergo MRI scanning, including but not limited to unable to remain still in an MRI scanner for more than 30 minutes, claustrophobia, presence of paramagnetic substances or pacemakers in body, weight over 300 lbs

Other: Experimental hypoglycemia

Diabetes Mellitus, Type 1

Diabetes Study -
Elizabeth Seaquist
See this study on