Cardiovascular DiseasesPhase 3NCT00000515
Randomized Trial of Dietary Intervention Therapy in Obese Hypertensives (DITOH)
A Phase 3 study testing diet, reducing in people with Cardiovascular Diseases and Heart Diseases, run by National Heart, Lung, and Blood Institute (NHLBI).
Trial summary
To determine the effects on blood pressure of dietary intervention, restricting caloric intake to 600 calories per day for 16 weeks compared to a control diet of 1200 calories per day in obese hypertensives. Read more about this study
- Who is it for?
- Ages 25 to 55 years
- Conditions the study is for
- Cardiovascular Diseases, Heart Diseases, Hypertension
- What is being tested?
- diet, reducing
- Type of treatment
- Lifestyle or therapy programme
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Jul 1984to Sep 1992
- 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 25 to 55 years
- All sexes
- No healthy volunteers
- Adult
Men and women, ages 25 to 55. Subjects were obese, weighing between 130 and 210 percent of ideal body weight. Subjects had diastolic blood pressures between 90 and 105 mm Hg and were not on antihypertensive medications.
About this study
To determine the effects on blood pressure of dietary intervention, restricting caloric intake to 600 calories per day for 16 weeks compared to a control diet of 1200 calories per day in obese hypertensives. Secondary aims included a study of psychological characteristics at baseline and during the weight loss and maintenance phases of the study.
Read the detailed description
BACKGROUND:
Hypertension is a highly prevalent disorder contributing to a large proportion of cardiovascular morbidity and mortality in the United States. Although drug therapy of elevated blood pressure can reduce the risks of cardiovascular morbidity and mortality, such therapy constitutes significant expense for individuals over long periods of time as well as large national expenditures. In addition, the side effects of drug therapy may be significant. DITOH would provide much needed information concerning the effects of various means of weight reduction on blood pressure as possible definitive therapy for hypertension or as an approach which could be combined with reduced drug dosages.
DESIGN NARRATIVE:
Randomized. After three weeks on a control diet, subjects were randomized to the Protein Sparing Modified Fast Diet which provided 600 calories per day (1.5 grams per kilogram of ideal body weight of high quality protein plus 19 grams of fat) or to a 1200 calorie per day Balanced Deficit Diet. After 16 weeks in the weight-loss phase, subjects entered the maintenance program for 20 weeks. Both diets were supplemented with vitamins, minerals, and fluids. The Protein Sparing Modified Fast Diet was supplemented with 5 grams of salt given as bouillon to equal the salt intake of the Balanced Deficit Diet. Patients were followed for 24 months after the end of the weight loss phase. The primary endpoint was change in diastolic blood pressure. Individuals who continued to have diastolic pressures above 104 mm Hg following the initial 16 week treatment period were treated with antihypertensive drugs.
The study completion date listed in this record was obtained from the Query/View/Report (QVR) System.
- Conditions
- Cardiovascular Diseases, Heart Diseases, Hypertension, Obesity
- Being tested
- diet, reducing
- Medical subject headings
- Cardiovascular Diseases, Heart Diseases, Hypertension, Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
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 startJul 1984
- Study completionSep 1992
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- More trials run by National Heart, Lung, and Blood Institute (NHLBI)The sponsor's other registered studies.
- 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
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
Sponsor and investigators
- Sponsor type
- US National Institutes of Health
- Investigators
- George Blackburn, Beth Israel Deaconess Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00000515
- Sponsor's protocol ID
- 34
- Other IDs
- R01HL031989-06A2
- Status last verified
- Feb 2005
- First submitted
- 27 Oct 1999
- Last updated
- 26 Nov 2013
- Results posted
- No
Study at a glance
From the registry record, last updated by the sponsor on 26 Nov 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Randomized Trial of Dietary Intervention Therapy in Obese Hypertensives (DITOH)
- ClinicalTrials.gov ID
- NCT00000515
- Acronym / sponsor ID
- 34
- Conditions
- Cardiovascular Diseases, Heart Diseases, Hypertension, Obesity
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Lead sponsor
- National Heart, Lung, and Blood Institute (NHLBI)US National Institutes of Health
- Study start
- Jul 1984
- Study completion
- Sep 1992 (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.
To determine the effects on blood pressure of dietary intervention, restricting caloric intake to 600 calories per day for 16 weeks compared to a control diet of 1200 calories per day in obese hypertensives. Secondary aims included a study of psychological characteristics at baseline and during the weight loss and maintenance phases of the study.
Detailed description
BACKGROUND:
Hypertension is a highly prevalent disorder contributing to a large proportion of cardiovascular morbidity and mortality in the United States. Although drug therapy of elevated blood pressure can reduce the risks of cardiovascular morbidity and mortality, such therapy constitutes significant expense for individuals over long periods of time as well as large national expenditures. In addition, the side effects of drug therapy may be significant. DITOH would provide much needed information concerning the effects of various means of weight reduction on blood pressure as possible definitive therapy for hypertension or as an approach which could be combined with reduced drug dosages.
DESIGN NARRATIVE:
Randomized. After three weeks on a control diet, subjects were randomized to the Protein Sparing Modified Fast Diet which provided 600 calories per day (1.5 grams per kilogram of ideal body weight of high quality protein plus 19 grams of fat) or to a 1200 calorie per day Balanced Deficit Diet. After 16 weeks in the weight-loss phase, subjects entered the maintenance program for 20 weeks. Both diets were supplemented with vitamins, minerals, and fluids. The Protein Sparing Modified Fast Diet was supplemented with 5 grams of salt given as bouillon to equal the salt intake of the Balanced Deficit Diet. Patients were followed for 24 months after the end of the weight loss phase. The primary endpoint was change in diastolic blood pressure. Individuals who continued to have diastolic pressures above 104 mm Hg following the initial 16 week treatment period were treated with antihypertensive drugs.
The study completion date listed in this record was obtained from the Query/View/Report (QVR) System.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
Who may qualify
- Ages
- 25 to 55 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- 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, 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 26 Nov 2013.
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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.
George Blackburn
Beth Israel Deaconess Medical Center
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing diet, reducing in people with Cardiovascular Diseases and Heart Diseases, run by National Heart, Lung, and Blood Institute (NHLBI).
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 26 Nov 2013. 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?
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 26 Nov 2013.