Dietary Intervention Study for Hypertension (DISH)

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: NCT00000497
Recruitment Status : Completed
First Posted : October 28, 1999
Last Update Posted : April 15, 2015
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by:
University of Mississippi Medical Center

Brief 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enable drug controlled hypertensive patients to remain at 'goal blood pressures' after antihypertensive medication was withdrawn. 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.

Condition or disease Intervention/treatment Phase
Cardiovascular Diseases Heart Diseases Hypertension Vascular Diseases Behavioral: diet, sodium-restricted Behavioral: diet, reducing Phase 3

Detailed Description:


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.


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 Type : Interventional  (Clinical Trial)
Allocation: Randomized
Primary Purpose: Treatment
Study Start Date : January 1980
Actual Study Completion Date : September 1994

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Ages Eligible for Study:   40 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
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.

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): NCT00000497

Sponsors and Collaborators
University of Mississippi Medical Center
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Herbert Langford University of Mississippi Medical Center

Publications: Identifier: NCT00000497     History of Changes
Other Study ID Numbers: 16
U01HL037854 ( U.S. NIH Grant/Contract )
First Posted: October 28, 1999    Key Record Dates
Last Update Posted: April 15, 2015
Last Verified: January 2000

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Vascular Diseases