- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00580957
The Autonomic Nervous System and the Metabolic Syndrome
Study Overview
Detailed Description
The purpose of this study is to look at the role of the autonomic nervous system, an involuntary nervous system that controls your blood pressure, in insulin resistance and the metabolic syndrome. Insulin is a substance that helps your body use the sugar in the food that you eat. Some people's tissues stop reacting in a normal way to insulin, a condition known as insulin resistance. A person with insulin resistance can have other health problems, such as obesity, high cholesterol, and high blood pressure. These problems together are called the metabolic syndrome. We think that the autonomic or involuntary nervous system controls the way your body responds to insulin. This system is changed in obese people, and we think that it may cause the insulin resistance. We plan to study this with two drugs -trimethaphan and L-NMMA. Neither of these drugs are approved by the Food and Drug Administration (FDA), and they will be used for research purposes only.
Fifty people will take part in this study.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Tennessee
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Nashville, Tennessee, United States, 37232
- Vanderbilt University Medical Center
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- For lean subjects:
- 21 subjects aged 18-60 yr.
- All potential volunteers will have routine blood test to screen for hepatic, renal, and hematological abnormalities.
- Body mass index < 25Kg/m^2 .
- Female volunteers of childbearing potential will undergo HCG pregnancy test at screening and again on the study day.
- For Obese subjects with metabolic syndrome:
- 21 subjects aged 18-60 yr.
- All potential volunteers will have routine blood test to screen for hepatic, renal, and hematological abnormalities.
- Body mass index > 30Kg/m^2.
Participants will be enrolled if they met at least three of the following criteria for metabolic syndrome (Expert panel, Jama 2001):
- Waist circumference >102 cm in men and >88 cm in women
- High fasting blood sugar (>110 mg%)
- Triglyceride levels >150 mg%
- Low HDL cholesterol (<40 mg% for men; <50 mg% for women)
- High blood pressure (systolic=130 and diastolic = 85 mmHg) • Female volunteers of childbearing potential will undergo serum HCG pregnancy test at screening and urine HCG pregnancy test again on the study day.
Exclusion Criteria:
- Pregnant females
- Subjects unable to give voluntary informed consent
- Subjects on anticoagulant drugs or anemic (anemia defined as Hcto less than 35%)
- Subjects with a recent medical illness documented by physicians's visit or detected during the screening visit.
- Subjects with a history of coronary heart disease.
- Subjects with known kidney or liver disease.
- Subjects with recent weight loss or consuming low carbohydrate diet.
Study Plan
How is the study designed?
Design Details
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Blocked
Active treatment arm.
Transient autonomic blockade with Trimethaphan and blood pressure restoration with L-NMMA will be used during insulin clamp
|
Trimethaphan 4 mg/min IV will be infused for the duration of the study.
L-NMMA 125-500 mcg/k/min IV will be titrated to restore blood pressure to pre-trimethaphan levels Insulin clamp will be used to determine insulin resistance
Other Names:
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Placebo Comparator: Intact
Saline will be used instead of trimethaphan during insulin clamp
|
Saline IV infusion to simulate trimethaphan infusion in active arm Insulin clamp will be done to determine insulin resistance
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Insulin Resistance
Time Frame: Last 30 minutes of a two hour insulin clamp
|
Glucose infusion rate in mg/kg/min
|
Last 30 minutes of a two hour insulin clamp
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Glucose Metabolism Disorders
- Metabolic Diseases
- Insulin Resistance
- Hyperinsulinism
- Metabolic Syndrome
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Antihypertensive Agents
- Autonomic Agents
- Peripheral Nervous System Agents
- Cholinergic Antagonists
- Cholinergic Agents
- Adjuvants, Anesthesia
- Ganglionic Blockers
- Nicotinic Antagonists
- Trimethaphan
Other Study ID Numbers
- 060085
- CRC-1522 (Other Identifier: Vanderbilt University)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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