Genetics of Hypertension and Its Intermediate Phenotypes
Primary Purpose
Cardiovascular Diseases, Hypertension
Status
Completed
Phase
Locations
Study Type
Observational
Intervention
Sponsored by

About this trial
This is an observational trial for Cardiovascular Diseases
Eligibility Criteria
No eligibility criteria
Sites / Locations
Outcomes
Primary Outcome Measures
Secondary Outcome Measures
Full Information
NCT ID
NCT00006499
First Posted
November 16, 2000
Last Updated
March 15, 2016
Sponsor
National Heart, Lung, and Blood Institute (NHLBI)
1. Study Identification
Unique Protocol Identification Number
NCT00006499
Brief Title
Genetics of Hypertension and Its Intermediate Phenotypes
Study Type
Observational
2. Study Status
Record Verification Date
July 2004
Overall Recruitment Status
Completed
Study Start Date
June 2000 (undefined)
Primary Completion Date
undefined (undefined)
Study Completion Date
April 2004 (Actual)
3. Sponsor/Collaborators
Name of the Sponsor
National Heart, Lung, and Blood Institute (NHLBI)
4. Oversight
5. Study Description
Brief Summary
To define the underlying genetics of hypertension in an Asian population by studying intermediate phenotypes.
Detailed Description
BACKGROUND:
Hypertension, an exceedingly common trait in most developed countries, imparts an increased risk of cardiovascular, cerebrovascular and renal diseases. Nevertheless, the primary determinants of elevated blood pressure in most patients are unknown. Recognizing that a sizable portion of variation in blood pressure is genetically determined, one line of research has focused on identifying genetic variants that contribute to the pathogenesis of hypertension. However, standard genetic linkage analysis using "hypertension" as a phenotype may lack power due to the multifactorial nature of the disorder. A way to overcome this challenge is to subdivide hypertensive subjects into more homogenous subgroups.
DESIGN NARRATIVE:
The overall goal, which is to define the underlying genetics of hypertension in an Asian population by studying intermediate phenotypes, can be divided into three parts. First, the rural Chinese population will be characterized by the collection of intermediate phenotype data on 600 unrelated individuals with high diastolic blood pressure and on 100 normotensive controls. Intermediate phenotypes include: 1) non-modulation of adrenal and renal vascular responses to angiotensin II with changes in sodium intake; 2) altered urinary kallikrein excretion; 3) low plasma renin activity response to volume depletion; 4) increased free cortisol excretion; and 5) insulin resistance. Second, candidate genes will be chosen according to the underlying physiology of the intermediate phenotypes, and variations in the coding sequences of these potentially relevant genes will be identified. Finally, polymorphisms identified in the candidate genes will be tested through case-control analyses defined by the intermediate phenotypes.
The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.
6. Conditions and Keywords
Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Cardiovascular Diseases, Hypertension
7. Study Design
10. Eligibility
Sex
All
Maximum Age & Unit of Time
100 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
No eligibility criteria
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Xiping Xu
Organizational Affiliation
Harvard University School of Public Health
12. IPD Sharing Statement
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Genetics of Hypertension and Its Intermediate Phenotypes
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