Systolic Hypertension in the Elderly Program (SHEP)
chlorthalidone
+ atenolol
+ reserpine
Cardiovascular Diseases+1
+ Cerebrovascular Disorders
+ Heart Diseases
See all eligibility criteria
Prevention Study
See protocol details
Summary
The primary objective was to assess whether long-term administration of antihypertensive therapy to elderly subjects with isolated systolic hypertension reduced the combined incidence of fatal and non-fatal stroke. The secondary objectives were to evaluate: the effect of long-term antihypertensive therapy on mortality from any cause in elderly people with isolated systolic hypertension; possible adverse effects of chronic use of antihypertensive drug treatment in this population; the effect of therapy on indices of quality-of-life; the natural history of isolated systolic hypertension in the placebo population. BACKGROUND: More than 3 million persons in the United States over the age of 60 have isolated systolic hypertension. They face an excess risk (2-3 fold) of stroke, other cardiovascular disease and death. Population-based data show that the prevalence rises from approximately 8 percent in the age group 60-69 years to approximately 20 percent over the age of 80. Based on available data, an annual stroke rate of 2.0 percent has been estimated in this population. The full-scale clinical trial followed a pilot study conducted from 1980 to 1983. Recruitment in the trial began in March 1985 and was finished in January 1988. Follow-up ended in February 1991. Data analysis continued through October 1996. DESIGN NARRATIVE: A randomized, double-blind trial in which 2,365 subjects were assigned to active treatment and 2,371 to placebo. For the active treatment group, a stepped-care regimen was used which included chlorthalidone 12.5 or 25 mg/day, and as needed, addition of atenolol 25 or 50 mg/day or reserpine, 0.05 or 0.10 mg/day. Treatment goal was to reduce systolic blood pressure by at least 20 mm Hg from baseline and to below 160 mm Hg with minimal amounts of study medication. The primary endpoint was the incidence of fatal and non-fatal stroke. Secondary endpoints were cardiovascular and coronary morbidity and mortality, all-cause mortality, and quality-of-life measures.
Protocol
This section provides details of the study plan, including how the study is designed and what the study is measuring.In this clinical study, participants are placed into groups randomly, like flipping a coin. This ensures that the study is fair and unbiased, making the results more reliable. By assigning participants by chance, researchers can better compare treatments without external influences.
Other Ways to Assign Participants
Non-randomized allocation: Participants are assigned based on specific factors, such as their medical condition or a doctor's decision.
None (Single-arm trial): If the study has only one group, all participants receive the same treatment, and no allocation is needed.
Neither participants nor researchers know who is receiving which treatment. This is the most rigorous way to reduce bias, ensuring that expectations do not influence the results.
Other Ways to Mask Information
Open-label: Everyone knows which treatment is being given.
Single-blind: Participants do not know which treatment they are receiving, but researchers do.
Triple-blind: Participants, researchers, and outcome assessors do not know which treatment is given.
Quadruple-blind: Participants, researchers, outcome assessors, and care providers all do not know which treatment is given.
Eligibility
Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.Conditions
Criteria
