Hypertension Clinical Trial
Official title:
Observational Cohort Study of Sodium, Weight and Cardiovascular Disease
To investigate cardiovascular events among individuals with low sodium intake or large weight changes in a prospective observational follow-up of subjects from the Trials of Hypertension Prevention (TOHP) study.
BACKGROUND:
Sodium reduction and weight loss lead to decreased blood pressure (BP). Among hypertensives,
BP lowering leads to decreased risk of MI, stroke, and cardiovascular death. Nonetheless,
concerns have been raised about increased numbers of cardiovascular events among individuals
with low sodium intake or large weight changes.
DESIGN NARRATIVE:
The prospective observational follow-up of the Trials of Hypertension Prevention (TOHP)
includes cardiovascular events among the 4, 507 surviving participants from the ten clinical
centers involved in Phases I and II of TOHP. Phase I was a randomized trial of the effects
of non- pharmacologic interventions, including sodium reduction and weight loss, on BP over
18 months of follow-up with 2,182 participants. Phase II examined the effects of sodium
reduction and weight loss on BP over a longer 36-month period in a randomized 2X2 factorial
design with 2,382 participants. During follow-up in Phases I and II of TOHP, several
measures of both weight and sodium excretion were carefully obtained on all participants.
The prospective observational follow-up specifically examines whether these values, with an
emphasis on average level of sodium excretion and weight changes are predictive of later
cardiovascular disease. The follow-up is conducted centrally by mail from the Division of
Preventive Medicine, which served as the Coordinating Center for Phases I and II, and which
has been very successful in conducting such large-scale studies by mail. Information on
cardiovascular events subsequent to the trial periods is collected through June, 2003,
representing an average follow-up of approximately fourteen years from the end of Phase I
and eight years from the end of Phase II. This cohort provides a unique resource to address
the impact in a normotensive population of salt restriction and weight change on subsequent
cardiovascular events.
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