Observational Cohort Study of Sodium, Weight and CVD

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)
ClinicalTrials.gov Identifier:
First received: September 28, 2000
Last updated: January 18, 2008
Last verified: January 2008

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.

Cardiovascular Diseases
Heart Diseases

Study Type: Observational

Resource links provided by NLM:

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: September 1999
Study Completion Date: August 2004
Primary Completion Date: August 2004 (Final data collection date for primary outcome measure)
Detailed Description:


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.


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.


Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

No eligibility criteria

  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT00006308

Sponsors and Collaborators
Investigator: Nancy Cook Brigham and Women's Hospital
  More Information

No publications provided

ClinicalTrials.gov Identifier: NCT00006308     History of Changes
Other Study ID Numbers: 916
Study First Received: September 28, 2000
Last Updated: January 18, 2008
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Vascular Diseases

ClinicalTrials.gov processed this record on April 17, 2014