Genetic Epidemiology of Blood Pressure Intervention

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: NCT00079690
Recruitment Status : Completed
First Posted : March 15, 2004
Last Update Posted : July 29, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To localize and identify new genes related to variation in blood pressure (BP) responses to a low dietary sodium intake, a high dietary sodium intake, oral potassium supplementation, and the cold pressor test.

Condition or disease
Cardiovascular Diseases Heart Diseases Hypertension

Detailed Description:


Systemic hypertension is a complex disease determined by both genetic and environmental factors and is of significant public health interest. In addition, identifying genes that interact significantly with dietary sodium and potassium intake, or even the cold pressure test may enable clinicians to target life style modification for prevention and treatment of hypertension.

The study is conducted in response to a Request for Applications issued in October, 2001 on the Interaction of Genes and the Environment in Shaping Risk Factors for Heart, Lung, Blood, and Sleep Disorders.


The study uses a family intervention study design. The investigators will recruit 750 sibships (n=1750 siblings) and their parents (n=1250) from 500 families, each family ascertained through a proband who has untreated high normal BP or stage-1 hypertension (systolic BP 130-160 mm Hg and diastolic BP 85-100 mm Hg) from rural China. They will collect baseline information on medical history, lifestyle risk factors, anthropometric measures, BP, and blood measures (renin activity, ACE, angiotensin II, natriuretic peptide, glucose, insulin, and lipids) in all participants, and dietary nutrient intake (three 24-hour recalls) and urinary sodium and potassium excretion (three 24-hour) in the siblings. They will conduct the following interventions in the siblings: a cold pressor test at baseline (day 2 or 3), a 1-week low sodium-feeding study (40 mmol sodium/day on days 4-10), a 1-week high sodium-feeding study (280 mmol sodium/day on days 11-17), and a 1-week oral potassium supplementation (90 mmol potassium/day on days 18-24). They will measure BP and 24-hour urinary sodium and potassium excretion during the last 3 days of each intervention period. They will also perform genotyping for genomewide linkage scans and for candidate genes in all siblings and their parents. BP responses to the interventions will be analyzed primarily as quantitative traits. The primary analyses include linkage analysis, transmission/disequilibrium test, and association analysis between genetic markers and BP responses to the interventions.

Study Type : Observational
Study Start Date : September 2002
Actual Primary Completion Date : August 2006
Actual Study Completion Date : August 2006

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
No eligibility criteria

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): NCT00079690

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Jiang He Tulane University of Louisiana