- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02730780
The Natriuretic Peptide System in African-Americans.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
High blood pressure, or hypertension, is a major cause of heart disease, heart failure, and stroke. Natriuretic peptides are cardiac derived hormones that may protect against hypertension. The classical actions of the natriuretic peptides include natriuresis, vasodilation, and inhibition of the renin-angiotensin-aldosterone system (RAAS), which support a key role for these hormones in blood pressure regulation.
Race based differences exist in the risk and severity of hypertension and cardiovascular disease, with African-American individuals typically being at greater risk compared with white individuals. Nearly half of African-American adults have hypertension, compared with one-third of whites. Additionally, salt-sensitivity denotes the impaired ability to handle a salt load with resulting increases in blood pressure. It is estimated that 75% of hypertensive African-Americans exhibit salt-sensitivity, compared with 35% of hypertensive whites. Why this predilection towards salt-sensitivity exists, particularly among African-American individuals, is not well understood. Thus, establishing the origins of salt retention in African Americans has biologic, preventative, and therapeutic importance, and may provide insight regarding racial differences in cardiovascular risk.
The natriuretic peptide system is the principal counter-regulatory mechanism to salt retention. However, little is known regarding racial differences in the natriuretic peptide system. Recently, it was discovered that African-Americans have lower natriuretic peptide levels compared with whites, raising the possibility that African-Americans individuals can have a relative "natriuretic peptide deficiency" with reduced natriuretic peptide responses to salt loading. However, the prior studies were based on epidemiologic data with individuals on random salt backgrounds. This highlights the need for more detailed physiologic studies, under controlled salt conditions and with standardized assessment of the natriuretic peptide and RAAS and tissue sodium stores.
The aim of this study is to assess the natriuretic peptide response to dietary salt loading in African-American individuals compared with white individuals. This study will test the primary hypothesis that compared with whites, African-American individuals have blunted natriuretic peptide responses to dietary salt loading.
Secondary hypotheses include:
- Compared with white individuals, African-American individuals have higher baseline tissue sodium content, and
- Compared with white individuals, African-American individuals have impaired "target organ" responses to salt loading, as manifested by higher blood pressure and increased frequency of salt-sensitive hypertension, decreased urinary sodium excretion, less suppression of plasma renin and serum aldosterone, and lack of increase in left ventricular early diastolic relaxation velocities.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Tennessee
-
Nashville, Tennessee, United States, 37203
- Vanderbilt Univeristy
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- age between 18 and 55 years
- BMI between 18 and <25 kg/m2
- normotensive or pre-hypertensive
- willing to adhere to study diets
Exclusion Criteria:
- prevalent cardiovascular disease or use of medications for cardiovascular disease
- Current or prior history of hypertension or use of blood pressure lowering medications
- Current or prior history of diabetes mellitus or use of anti-diabetic medications
- Prevalent renal disease (eGFR < 60 ml/min/1.73m2), abnormal serum sodium or potassium
- Current or prior smoker
- Current pregnancy
- Current steroid use
- Contraindications to MRI
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Health Services Research
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: African-American
40 healthy African-American subjects will be enrolled and each will undergo study procedures at 4 separate visits, with each visit occurring 7-days apart.
After a baseline visit, the subject will begin either a low-salt or high-salt diet, based upon randomization assignment to one of the two following dietary protocols: A) low-salt diet, washout, then high-salt diet; or B) high-salt diet, washout, then low-salt diet.
Each dietary or washout period lasts for 7 days.
|
The low-salt diet (7 days) will consist of meals, snacks, and sodium free water provided by the study staff.
The high-salt diet (7 days) consists of each subject's usual diet, supplemented each day with 2 bouillon broth packets, which will be provided to the subject by the study staff.
|
Other: Whites
40 healthy white subjects will be enrolled and each will undergo study procedures at 4 separate visits, with each visit occurring 7-days apart.
After a baseline visit, the subject will begin either a low-salt or high-salt diet, based upon randomization assignment to one of the two following dietary protocols: A) low-salt diet, washout, then high-salt diet; or B) high-salt diet, washout, then low-salt diet.
Each dietary or washout period lasts for 7 days.
|
The low-salt diet (7 days) will consist of meals, snacks, and sodium free water provided by the study staff.
The high-salt diet (7 days) consists of each subject's usual diet, supplemented each day with 2 bouillon broth packets, which will be provided to the subject by the study staff.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
The difference in circulating NT-proANP levels in response to low and high dietary salt.
Time Frame: 4 years
|
4 years
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Tissue sodium content
Time Frame: 4 years
|
Measured by sodium MRI
|
4 years
|
Blood pressure
Time Frame: 4 years
|
4 years
|
|
Salt-sensitive hypertension
Time Frame: 4 years
|
Measured by change in mean arterial pressure
|
4 years
|
Urinary sodium excretion
Time Frame: 4 years
|
Measured from 24 hour urine collection
|
4 years
|
Myocardial early relaxation velocities
Time Frame: 4 years
|
Measured from Echocardiography as tissue Doppler e'
|
4 years
|
Plasma renin
Time Frame: 4 years
|
Physiological parameter
|
4 years
|
Serum aldosterone
Time Frame: 4 years
|
Physiological parameter
|
4 years
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Deepak K Gupta, MD, Vanderbilt Cardiovascular Medicine
Publications and helpful links
General Publications
- Gupta DK, de Lemos JA, Ayers CR, Berry JD, Wang TJ. Racial Differences in Natriuretic Peptide Levels: The Dallas Heart Study. JACC Heart Fail. 2015 Jul;3(7):513-519. doi: 10.1016/j.jchf.2015.02.008. Epub 2015 Jun 10.
- Gupta DK, Claggett B, Wells Q, Cheng S, Li M, Maruthur N, Selvin E, Coresh J, Konety S, Butler KR, Mosley T, Boerwinkle E, Hoogeveen R, Ballantyne CM, Solomon SD. Racial differences in circulating natriuretic peptide levels: the atherosclerosis risk in communities study. J Am Heart Assoc. 2015 May 21;4(5):e001831. doi: 10.1161/JAHA.115.001831.
Study record dates
Study Major Dates
Study Start (Actual)
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 (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 151943
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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