Cardiovascular DiseasesPhase 3NCT00000497
Dietary Intervention Study for Hypertension (DISH)
A Phase 3 study testing diet, sodium-restricted and diet, reducing in people with Cardiovascular Diseases and Heart Diseases, run by University of Mississippi Medical Center.
Trial summary
The primary objective of this multicenter cooperative clinical trial was to determine if dietary modification would enable drug controlled hypertensive patients to remain at 'goal blood pressures' after antihypertensive medication was withdrawn. Read more about this study
- Who is it for?
- Ages 40 years and older
- Conditions the study is for
- Cardiovascular Diseases, Heart Diseases, Hypertension
- What is being tested?
- diet, sodium-restricted and diet, reducing
- Type of treatment
- Lifestyle or therapy programme
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Jan 1980to Sep 1994
- Phase
- Phase 3
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 40 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Men and women with hypertension. Diastolic blood pressure equal to or above 95 mm Hg and 90 mm Hg, respectively for home and clinic readings.
About this study
The primary objective of this multicenter cooperative clinical trial was to determine if dietary modification would enable drug controlled hypertensive patients to remain at 'goal blood pressures' after antihypertensive medication was withdrawn. The proposal made use of the HDFP hypertensive population who had five years of treatment for their hypertension. Additionally, the group of investigators proposed to determine if dietary treatment would permit patients not previously adequately controlled under the HDFP program to achieve normalization of blood pressure with a combination of dietary modification and drug treatment. The study also proposed to search for predictors (i.e., levels of hormonal agents such as plasma renin activity) of responsiveness to dietary manipulation among the hypertensive population as well as to identify psychological attributes that might be of importance in managing these patients.
Read the detailed description
BACKGROUND:
The background against which the proposal was made had been developed from the combined information of the Veterans Administration Cooperative Study and the Hypertension Detection and Follow-up Study. Data from both these studies clearly established the importance of reducing sodium content by means of diuretic administration as a mainstay of the treatment of elevated blood pressure. The risks of the lifetime of treatment were undefined, but the cost of indefinite treatment of high blood pressure was sufficiently high to stimulate careful examination of alternative modes of management of such patients. The demonstrations by Parijs and others that moderate reduction in sodium intake led to improved management of hypertension and data suggesting that increased potassium intake may enhance this blood pressure lowering effect associated with sodium restriction was cited by the investigators as a basis for the trial. Any additional data regarding modest sodium restriction and potassium ingestion would have impact on utilizing such therapy in preventing hypertension and as adjunctive therapy.
DESIGN NARRATIVE:
The study was intended to take advantage of the availability of patients at the three centers at the completion of the Hypertension Detection and Follow-up Program Study. These patients were enrolled as 'stepped-care' participants and had been treated with antihypertensive drugs for at least five years. The main objective of the study was to determine the contribution of dietary modification to maintenance of normal blood pressure after withdrawal of medication. Two types of diet change were followed: 1) reduction of sodium intake coupled with increased potassium intake; and 2) reduction of weight in the subgroups of patients that were obese.
- Being tested
- diet, sodium-restricted, diet, reducing
- Medical subject headings
- Cardiovascular Diseases, Heart Diseases, Hypertension, Vascular Diseases
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
diet, sodium-restrictedBehavioural
diet, reducingBehavioural
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 Oct 1999 (estimated)
- Study startJan 1980
- Study completionSep 1994
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (6)Papers the sponsor has linked to this study.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Treatment
- Allocation
- Randomised
Sponsor and investigators
- Lead sponsor
- University of Mississippi Medical Center
- Sponsor type
- University, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Investigators
- Herbert Langford, University of Mississippi Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00000497
- Sponsor's protocol ID
- 16
- Other IDs
- U01HL037854
- Status last verified
- Jan 2000
- First submitted
- 27 Oct 1999
- Last updated
- 15 Apr 2015
- Results posted
- No
Publications
Wassertheil-Smoller S, Langford HG, Blaufox, MD, et al: Rate of Hypertension Return After Withdrawal of Prolonged Antihypertensive Therapy. Clin Sci, 63: 423S-525S (Supp 8), 1982.
Wassertheil-Smoller, Langford HG, Blaufox MD, Oberman A, Hawkins M. Diuretics and salt restriction in blood pressure control. Curr Concepts Nutr. 1983;12:175-89. No abstract available.
PubMed 6342972Langford HG, Blaufox, MD, Oberman A, et al: Effect of Weight Loss on the Return of Hypertension After Withdrawal of Prolonged Antihypertensive Therapy. Nutritional Prevention of Cardiovascular Disease, 301-315, 1984.
Wing RR, Caggiula AW, Nowalk MP, Koeske R, Lee S, Langford H. Dietary approaches to the reduction of blood pressure: the independence of weight and sodium/potassium interventions. Prev Med. 1984 May;13(3):233-44. doi: 10.1016/0091-7435(84)90081-1.
PubMed 6494106Langford HG, Blaufox MD, Oberman A, Hawkins CM, Curb JD, Cutter GR, Wassertheil-Smoller S, Pressel S, Babcock C, Abernethy JD, et al. Dietary therapy slows the return of hypertension after stopping prolonged medication. JAMA. 1985 Feb 1;253(5):657-64.
PubMed 3881608Langford HG, Schlundt D, Levine K. Sodium restriction in hypertension. Compr Ther. 1984 Sep;10(9):6-11.
PubMed 6488753
Study at a glance
From the registry record, last updated by the sponsor on 15 Apr 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Dietary Intervention Study for Hypertension (DISH)
- ClinicalTrials.gov ID
- NCT00000497
- Acronym / sponsor ID
- 16
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Lead sponsor
- University of Mississippi Medical CenterUniversity, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Study start
- Jan 1980
- Study completion
- Sep 1994 (actual)
- First posted
- 28 Oct 1999 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The primary objective of this multicenter cooperative clinical trial was to determine if dietary modification would enable drug controlled hypertensive patients to remain at 'goal blood pressures' after antihypertensive medication was withdrawn. The proposal made use of the HDFP hypertensive population who had five years of treatment for their hypertension. Additionally, the group of investigators proposed to determine if dietary treatment would permit patients not previously adequately controlled under the HDFP program to achieve normalization of blood pressure with a combination of dietary modification and drug treatment. The study also proposed to search for predictors (i.e., levels of hormonal agents such as plasma renin activity) of responsiveness to dietary manipulation among the hypertensive population as well as to identify psychological attributes that might be of importance in managing these patients.
Detailed description
BACKGROUND:
The background against which the proposal was made had been developed from the combined information of the Veterans Administration Cooperative Study and the Hypertension Detection and Follow-up Study. Data from both these studies clearly established the importance of reducing sodium content by means of diuretic administration as a mainstay of the treatment of elevated blood pressure. The risks of the lifetime of treatment were undefined, but the cost of indefinite treatment of high blood pressure was sufficiently high to stimulate careful examination of alternative modes of management of such patients. The demonstrations by Parijs and others that moderate reduction in sodium intake led to improved management of hypertension and data suggesting that increased potassium intake may enhance this blood pressure lowering effect associated with sodium restriction was cited by the investigators as a basis for the trial. Any additional data regarding modest sodium restriction and potassium ingestion would have impact on utilizing such therapy in preventing hypertension and as adjunctive therapy.
DESIGN NARRATIVE:
The study was intended to take advantage of the availability of patients at the three centers at the completion of the Hypertension Detection and Follow-up Program Study. These patients were enrolled as 'stepped-care' participants and had been treated with antihypertensive drugs for at least five years. The main objective of the study was to determine the contribution of dietary modification to maintenance of normal blood pressure after withdrawal of medication. Two types of diet change were followed: 1) reduction of sodium intake coupled with increased potassium intake; and 2) reduction of weight in the subgroups of patients that were obese.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
Who may qualify
- Ages
- 40 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| diet, sodium-restricted | Behavioural | – |
| diet, reducing | Behavioural | – |
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Apr 2015.
- BackgroundWassertheil-Smoller S, Langford HG, Blaufox, MD, et al: Rate of Hypertension Return After Withdrawal of Prolonged Antihypertensive Therapy. Clin Sci, 63: 423S-525S (Supp 8), 1982.
- Background: PubMed 6342972Wassertheil-Smoller, Langford HG, Blaufox MD, Oberman A, Hawkins M. Diuretics and salt restriction in blood pressure control. Curr Concepts Nutr. 1983;12:175-89. No abstract available.
- BackgroundLangford HG, Blaufox, MD, Oberman A, et al: Effect of Weight Loss on the Return of Hypertension After Withdrawal of Prolonged Antihypertensive Therapy. Nutritional Prevention of Cardiovascular Disease, 301-315, 1984.
- Background: PubMed 6494106Wing RR, Caggiula AW, Nowalk MP, Koeske R, Lee S, Langford H. Dietary approaches to the reduction of blood pressure: the independence of weight and sodium/potassium interventions. Prev Med. 1984 May;13(3):233-44. doi: 10.1016/0091-7435(84)90081-1.
- Background: PubMed 3881608Langford HG, Blaufox MD, Oberman A, Hawkins CM, Curb JD, Cutter GR, Wassertheil-Smoller S, Pressel S, Babcock C, Abernethy JD, et al. Dietary therapy slows the return of hypertension after stopping prolonged medication. JAMA. 1985 Feb 1;253(5):657-64.
- Background: PubMed 6488753Langford HG, Schlundt D, Levine K. Sodium restriction in hypertension. Compr Ther. 1984 Sep;10(9):6-11.
Related trials for Cardiovascular Diseases
Recruiting
Efficacy and Safety of Ischemic Preconditioning Therapy Versus Optimal Medical Therapy in Reducing the Recurrence of Ischemic Events in Symptomatic Moyamoya Disease
Moya Moya Disease, Moyamoya Syndrome
Enrolling by invitationObservational study
Multi-Scale Analysis of Phenotypes in Heart Failure (MAP-HEART)
Heart Failure
Active, not recruiting
RACE-CARS - RAndomized Cluster Evaluation of Cardiac ARrest Systems
Cardiac Arrest
Active, not recruiting
Comparison of the Effects of Kinesio Taping and Interval Exercise in Patients Diagnosed With Venous Insufficiency: A Randomised Controlled Trial
Chronic Venous Insufficiency C2 and Below
RecruitingPhase 1/2
Safety and Efficacy of CG-BM1 in Ischemic Stroke
Ischemic Stroke or High-risk TIA (ABCD² ≥ 4)
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Herbert Langford
University of Mississippi Medical Center
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing diet, sodium-restricted and diet, reducing in people with Cardiovascular Diseases and Heart Diseases, run by University of Mississippi Medical Center.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 15 Apr 2015. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00000497, which also lists 6 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Apr 2015.