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

The Renin-Aldosterone Axis in Postural Tachycardia Syndrome

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified August 2009 by Vanderbilt University.
Recruitment status was:  Recruiting
Information provided by:
Vanderbilt University Identifier:
First received: August 18, 2009
Last updated: August 19, 2009
Last verified: August 2009
The purpose of this study is to determine the role of the renin-angiotensin-aldosterone in the pathophysiology of postural tachycardia syndrome, and to provide an insight about the disease process in this disorder.

Condition Intervention
Postural Tachycardia Syndrome Drug: Angiotensin II

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: The Renin-Aldosterone Axis in Postural Tachycardia Syndrome

Resource links provided by NLM:

Further study details as provided by Vanderbilt University:

Primary Outcome Measures:
  • Difference in blood pressure rise between patients and healthy volunteers [ Time Frame: 1 hour ]

Secondary Outcome Measures:
  • Differences in blood volume hormones responses between patients and healthy volunteers [ Time Frame: 1 hour ]

Estimated Enrollment: 18
Study Start Date: April 2009
Estimated Study Completion Date: April 2011
Estimated Primary Completion Date: April 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Healthy controls
Drug: Angiotensin II
Angiotensin II infusion for 1 hour
Experimental: 2
Drug: Angiotensin II
Angiotensin II infusion for 1 hour


Ages Eligible for Study:   18 Years to 64 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Diagnosis of postural tachycardia syndrome by the Vanderbilt Autonomic Dysfunction Center criteria
  • Age between 18-64 years
  • Male or females are eligible
  • Able and willing to provide informed consent
  • Healthy control subjects with no major medical problem (including postural tachycardia syndrome), free of medications during the study

Exclusion Criteria:

  • Overt cause of postural tachycardia e.g., dehydration
  • Inability to give or withdraw informed consent
  • Pregnancy
  • Hypertension (BP > 140/90)
  • Significant co-morbid condition
  • Other factors which in the investigator`s opinion would prevent the subject from completing the protocol
  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: NCT00962949

Contact: Bonnie Black, RN 615-343-6862
Contact: Ginnie Farley, RA 615-322-0083 ginnie.farley@Vanderbilt.Edu

United States, Tennessee
Vanderbilt University Recruiting
Nashville, Tennessee, United States, 37232
Principal Investigator: David Robertson, MD         
Sub-Investigator: Hossam Mustafa, MD         
Sponsors and Collaborators
Vanderbilt University
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Hossam Mustafa MD, Vanderbilt University school Of Medicine Identifier: NCT00962949     History of Changes
Other Study ID Numbers: 081398
Study First Received: August 18, 2009
Last Updated: August 19, 2009

Keywords provided by Vanderbilt University:
Orthostatic intolerance

Additional relevant MeSH terms:
Postural Orthostatic Tachycardia Syndrome
Pathologic Processes
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Orthostatic Intolerance
Primary Dysautonomias
Autonomic Nervous System Diseases
Nervous System Diseases
Angiotensin II
Vasoconstrictor Agents
Serine Proteinase Inhibitors
Protease Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action processed this record on September 18, 2017