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Adrenocorticotropic Hormone Stimulation in Postural Orthostatic Tachycardia Syndrome (POTS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01764711
Recruitment Status : Active, not recruiting
First Posted : January 9, 2013
Last Update Posted : May 3, 2021
National Institutes of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
Alfredo Gamboa, Vanderbilt University

Brief Summary:
This study is to determine different chemical levels in the blood during a low salt diet. This study will compare normal volunteers to those with Postural Tachycardia Syndrome (POTS)

Condition or disease Intervention/treatment Phase
Postural Tachycardia Syndrome Drug: Cosyntropin administration Not Applicable

Detailed Description:

Patients with postural tachycardia syndrome had a subnormal increment in aldosterone with upright posture, which might reflect a blunted adrenal response to stimulation upon assuming upright posture. In this AIM, we propose to assess the adrenal response to aldosterone stimulation with intravenous adrenocorticotropin hormone.

For this protocol, subjects enrolled in the parent study will be approached about this sub-study. Subjects will be assured that they are not required to participate in this study even if they choose to participate in the parent study.

There will be no randomization for this specific sub-study. The order of diets (low sodium vs. high sodium) will be performed as a part of the parent study, and not as a part of this sub-study. This sub-study will only be performed in the LOW dietary salt phase.

All subjects will be previously screened and evaluated as a part of the parent study. No further screening will be performed exclusively for this study. Women of childbearing potential will have had a serum pregnancy test as a part of the parent study. Pregnant women will not be allowed to participate.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 50 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Other
Official Title: Aldosterone and Sodium Regulation in Postural Tachycardia Syndrome Participating in the Dietary Salt in Orthostatic Tachycardia Study.
Study Start Date : January 2013
Actual Primary Completion Date : December 2020
Estimated Study Completion Date : December 2021

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Hormones
Drug Information available for: Cosyntropin

Arm Intervention/treatment
Experimental: Low Salt Diet
Each participant will be asked to sit in a chair for 30 minutes prior to a blood draw. Then a small dose of cosyntropin is administered intravenous. Blood samples will be drawn again at 30 minutes and 60 minutes after the drug has been given.
Drug: Cosyntropin administration
After 30 minutes of rest in the seated position, participants will be given cosyntropin intravenously. Blood samples will be taken 30 minutes pre-drug administration, 30 minutes post and 60 minutes post drug administration.
Other Name: Cortrosyn

Primary Outcome Measures :
  1. Adrenal responsiveness to adrenocorticotropin hormone. (ACTH) [ Time Frame: 24 hours ]
    To assess the adrenal responsiveness to adrenocorticotropin hormone (ACTH), as measured by plasma aldosterone level, is contributing to the pathophysiology of Orthostatic Tachycardia.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

Subjects will be enrolled in the parent study "Dietary Salt in Postural Tachycardia Syndrome" during the "LOW SALT" phase

Postural Tachycardia Syndrome Diagnosed with postural tachycardia syndrome by the Vanderbilt Autonomic Dysfunction Center Increase in heart rate ≥30 beats/min with position change from supine to standing (10 minutes) Chronic symptoms consistent with POTS that are worse when upright and get better with recumbence

  • Control Subjects

    • Healthy, non-obese, non-smokers without orthostatic tachycardia
    • Selected to match profiles of POTS patients (gender, age)
    • Not using vasoactive medication
  • Age between 18-50 years
  • Male and female subjects are eligible.
  • Able and willing to provide informed consent

Exclusion Criteria:

  • Overt cause for postural tachycardia (such as acute dehydration)
  • Inability to give, or withdrawal of, informed consent
  • pregnant
  • Other factors which in the investigator's opinion would prevent the subject from completing the protocol.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01764711

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United States, Tennessee
Vanderbilt University Medical Center
Nashville, Tennessee, United States, 37232
Sponsors and Collaborators
Vanderbilt University
National Institutes of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
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Principal Investigator: Alfredo J Gamboa, MD Vanderbilt University Medical Center
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Responsible Party: Alfredo Gamboa, Research Associate Professor of Medicine, Vanderbilt University Identifier: NCT01764711    
Other Study ID Numbers: 120612
R01HL102387 ( U.S. NIH Grant/Contract )
First Posted: January 9, 2013    Key Record Dates
Last Update Posted: May 3, 2021
Last Verified: April 2021
Keywords provided by Alfredo Gamboa, Vanderbilt University:
Additional relevant MeSH terms:
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Postural Orthostatic Tachycardia Syndrome
Pathologic Processes
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Cardiac Conduction System Disease
Orthostatic Intolerance
Primary Dysautonomias
Autonomic Nervous System Diseases
Nervous System Diseases
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs