CARDIA-Salt Sensitivity of Blood Pressure (SSBP)
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ClinicalTrials.gov Identifier: NCT04258332 |
Recruitment Status :
Active, not recruiting
First Posted : February 6, 2020
Last Update Posted : May 7, 2024
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Condition or disease | Intervention/treatment | Phase |
---|---|---|
Salt Sensitivity of Blood Pressure Hypertension | Dietary Supplement: High Salt Diet Dietary Supplement: Low Salt Diet | Not Applicable |
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 500 participants |
Allocation: | Randomized |
Intervention Model: | Crossover Assignment |
Masking: | None (Open Label) |
Primary Purpose: | Other |
Official Title: | Dietary Sodium Inflammation and Salt Sensitivity of Blood Pressure |
Actual Study Start Date : | May 17, 2021 |
Estimated Primary Completion Date : | August 31, 2024 |
Estimated Study Completion Date : | August 31, 2024 |
Arm | Intervention/treatment |
---|---|
High Salt Diet then Low Salt Diet
The high-salt diet will be achieved through the supplementation of each participant's usual diet with Na+ bullion packets (2 packets per day). This will increase Na+ intake by approximately 2,200 mg (≈100 mEq Na+) to a total greater than 5,000 mg Na+ per day based on prior estimates of Na+ intake (see section C1.2). In addition, 1,000 mg of calcium carbonate (provided via Tums tablets) will be taken daily on the high Na+ diet to reduce the potential impact of changes in calcium intake on blood pressure. The low-salt diet is comprised of 7 days of freshly prepared frozen meals, snacks, and Na+ free water. All low-salt meals will be prepared in each site's Metabolic Kitchen, with standardization of diets across sites. The low-salt diet includes: 20 mEq Na+ (±2 mEq) (460 mg/day), 100 mEq potassium (±2 mEq), and 1,000 mg calcium (±50 mg). |
Dietary Supplement: High Salt Diet
Patients will be randomized to be on a high salt diet for 7 days. Dietary Supplement: Low Salt Diet Patients will be randomized to be on a low salt for 7 days. |
Low Salt Diet then High Salt Diet
The low-salt diet is comprised of 7 days of freshly prepared frozen meals, snacks, and Na+ free water. All low-salt meals will be prepared in each site's Metabolic Kitchen, with standardization of diets across sites. The low-salt diet includes: 20 mEq Na+ (±2 mEq) (460 mg/day), 100 mEq potassium (±2 mEq), and 1,000 mg calcium (±50 mg). The high-salt diet will be achieved through the supplementation of each participant's usual diet with Na+ bullion packets (2 packets per day). This will increase Na+ intake by approximately 2,200 mg (≈100 mEq Na+) to a total greater than 5,000 mg Na+ per day based on prior estimates of Na+ intake (see section C1.2). In addition, 1,000 mg of calcium carbonate (provided via Tums tablets) will be taken daily on the high Na+ diet to reduce the potential impact of changes in calcium intake on blood pressure. |
Dietary Supplement: High Salt Diet
Patients will be randomized to be on a high salt diet for 7 days. Dietary Supplement: Low Salt Diet Patients will be randomized to be on a low salt for 7 days. |
- Salt sensitivity of blood pressure [ Time Frame: 14 days ]The change in 24-hour ambulatory mean arterial pressure (MAP) from one week of high-salt to one week of low-salt diet
- Immune response to dietary salt loading, IL-6 [ Time Frame: 14 days ]Circulating levels of IL-6
- Immune response to dietary salt loading, Change in circulating levels of IL-17 [ Time Frame: 14 days ]Circulating levels of IL-17
- Immune response to dietary salt loading, IL-10 [ Time Frame: 14 days ]Circulating levels of IL-10
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, Learn About Clinical Studies.
Ages Eligible for Study: | 50 Years to 70 Years (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Potentially eligible individuals must consent to and be willing to adhere to the study protocol. We will include individuals not taking anti-HTN medications, i.e. normotensives and untreated hypertensives, and individuals with controlled HTN by use of ≤ 3 anti-HTN medications.
Exclusion Criteria:
- Unwilling to adhere to the study protocol
- Resistant HTN, defined as taking ≥ 4 anti-HTN medications to control BP or uncontrolled BP despite ≥ 3 anti-HTN medications that includes a diuretic
- Contraindications to high- or low-salt diet (e.g. heart, renal, or liver failure, postural orthostatic tachycardia syndrome)
- Use of salt tabs, fludricortisone, midodrine
- Contraindications to 24hr ABPM: bilateral upper extremity lymphedema, cuff will not fit
- Medical contraindications to foods, e.g. celiac disease, nut allergy, egg allergy, etc.
- Year 35 core exam systolic BP < 90 or > 160 mm Hg or diastolic BP < 50 or > 100 mm Hg
- Current use of steroids, NSAIDS, anti-inflammatories
- Rheumatologic condition (e.g. Lupus, Rheumatoid Arthritis, Psoriatic arthritis, Inflammatory Bowel Disease, Multiple Sclerosis
- Immune deficiency or immunosuppressed
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 ClinicalTrials.gov identifier (NCT number): NCT04258332
United States, Alabama | |
University of Alabama Birmingham | |
Birmingham, Alabama, United States, 35294 | |
United States, Illinois | |
Northwestern University | |
Chicago, Illinois, United States, 60611 |
Responsible Party: | Deepak Gupta, Asst Professor, Vanderbilt University Medical Center |
ClinicalTrials.gov Identifier: | NCT04258332 |
Other Study ID Numbers: |
190622 |
First Posted: | February 6, 2020 Key Record Dates |
Last Update Posted: | May 7, 2024 |
Last Verified: | May 2024 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | Research data will be shared according to the most recent NIH guideline. The data collected will be made available by the CARDIA Data Coordinating Center (DCC) both to the study for use by other investigators and to NHLBI for inclusion in the NHLBI's Data Repository Program, in accordance with the NHLBI Policy for Data Sharing from Clinical Trials and Epidemiological Studies, http://www.nhlbi.nih.gov/funding/datasharing.htm. Through the conduct of the study and in resource sharing, attention will be given to protect private health information; thus, we will make data available to others through the CARDIA DCC under a data use agreement specifying (1) to use the data only for research purposes and not to identify an individual participant; (2) to secure the data using appropriate computer technology; and (3) to destroy or return the data after analyses are completed. The overall CARDIA DCC at the UAB will be responsible for overseeing approval and sharing of research data. |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Hypersensitivity Immune System Diseases |