This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Hypoglycemia Associated Autonomic Failure in Type 1 DM, Q2

This study has been completed.
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Information provided by (Responsible Party):
Steve Davis, Vanderbilt University Identifier:
First received: January 1, 2008
Last updated: December 10, 2014
Last verified: December 2014
Alprazolam (Xanax) will blunt the body's ability to defend itself from low blood sugar.

Condition Intervention
Type 1 Diabetes Drug: Alprazolam Other: control group

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Participant)
Official Title: Hypoglycemia Associated Autonomic Failure in Type 1 DM, Question 2

Resource links provided by NLM:

Further study details as provided by Steve Davis, Vanderbilt University:

Primary Outcome Measures:
  • Catecholamine levels [ Time Frame: Comparative study performed every 6-8 weeks ]

Estimated Enrollment: 56
Study Start Date: June 2005
Study Completion Date: June 2009
Primary Completion Date: June 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 2
Hyperinsulinemic glucose clamp with Xanax given orally at beginning of each 2 hour clamp on day 1.
Drug: Alprazolam
1 mg alprazolam given orally 60 minutes prior to each 2 hour glucose clamp on day 1 (x2)
Other Name: Xanax
Experimental: 1
Hyperinsulinemic glucose clamp in group with no drug.
Other: control group
control group is two hyperinsulinemic glucose clamps on day 1 with no drug given.

Detailed Description:

Due to the fundamental importance of glucose as a cerebral fuel, a complex and redundant counterregulatory response to hypoglycemia exists in man. Some studies have shown that prior activation of GABA(A) receptors may result in blunting of counterregulatory responses during next day hypoglycemia.

The Specific Aim is to determine if repeated activation of GABA(A) receptors using Alprazolam will result in blunting of neuroendocrine, ANS and metabolic counterregulatory mechanisms during next day hypoglycemia in T1DM and healthy man.


Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • 16 (8 males, 8 females) Type 1 diabetes patients aged 18-45 yr.
  • 16 (8 males, 8 females) healthy controls aged 18-45 yr.
  • HbA1c > 7.0% (Type 1 diabetes patients)
  • Had diabetes for 2-15 years (Type 1 diabetes patients)
  • No clinical evidence of diabetic tissue complications (Type 1 diabetes patients)
  • Body mass index 21-30 kg · m-2
  • Normal bedside autonomic function
  • Normal results of routine blood test to screen for hepatic, renal, and hematological abnormalities
  • Female volunteers of childbearing potential: negative HCG pregnancy test

Exclusion Criteria:

  • Prior history of poor health: any current or prior disease condition that alters carbohydrate metabolism and prior cardiac events and/or evidence for cardiac disease
  • Hemoglobin of less than 12 g/dl
  • Abnormal results following screening tests
  • Pregnancy
  • Subjects unable to give voluntary informed consent
  • Subjects with known liver or kidney disease
  • Subjects taking steroids
  • Subjects taking beta blockers
  • Subjects on anticoagulant drugs, anemic, or with known bleeding diseases
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00592332

United States, Tennessee
Vanderbilt University
Nashville, Tennessee, United States, 37232
Sponsors and Collaborators
Vanderbilt University
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Principal Investigator: Stephen N Davis, MD Vanderbilt University
  More Information

Responsible Party: Steve Davis, Department Chair, Vanderbilt University Identifier: NCT00592332     History of Changes
Other Study ID Numbers: IRB#040908-HAAF-T1DM-Q2
Study First Received: January 1, 2008
Last Updated: December 10, 2014

Additional relevant MeSH terms:
Pure Autonomic Failure
Glucose Metabolism Disorders
Metabolic Diseases
Primary Dysautonomias
Autonomic Nervous System Diseases
Nervous System Diseases
Hypnotics and Sedatives
Central Nervous System Depressants
Physiological Effects of Drugs
Anti-Anxiety Agents
Tranquilizing Agents
Psychotropic Drugs
GABA Modulators
GABA Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action processed this record on August 22, 2017