Mechanisms Underlying Abnormal Ambulatory BP Patterns

May 12, 2016 updated by: National Heart, Lung, and Blood Institute (NHLBI)
To understand the mechanism(s) underlying sodium-dependent blood pressure control, and to determine the consequences thereof.

Study Overview

Status

Completed

Conditions

Detailed Description

BACKGROUND:

The blood pressure of a significant percentage of the hypertensive population, and the normotensive population at a high risk for the development of hypertension (Blacks and older individuals), is sodium (salt)-dependent. That is to say, increasing the intake of salt will increase blood pressure in these individuals; conversely, and more importantly, decreasing the intake of salt will reduce blood pressure.

DESIGN NARRATIVE:

The investigators believed that the mechanisms responsible for sodium-dependent blood pressure were only indirectly linked to race, sex, and age. Their research was consistent with the hypothesis that sodium-dependent blood pressure control resulted from decreased responsiveness of the renal and adrenal blood pressure regulatory systems. This produced abnormal daily blood pressure patterns, with reduced fluctuation resulting in extended periods of increased blood pressure. The increased cardiovascular load led to the early development of cardiovascular and renal disease, including hypertension. They tested this hypothesis by identifying 'high risk' and 'normal risk' subjects based on renal responses to sodium restriction. The subjects were equal numbers of healthy males and females, Blacks and whites, between the ages of 55-70 years. Using an innovative approach, they then examined the influence of risk status on 24-hour patterns of blood pressure, hormonal activity, and sodium handling. Finally, they determined the clinical significance of the profiles by examining changes in cardiac and renal status at a two-year follow-up.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Study Type

Observational

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

No older than 100 years (Child, Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

No eligibility criteria

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Heart, Lung, and Blood Institute (NHLBI)

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 1993

Study Completion (Actual)

December 1, 1995

Study Registration Dates

First Submitted

May 25, 2000

First Submitted That Met QC Criteria

May 25, 2000

First Posted (Estimate)

May 26, 2000

Study Record Updates

Last Update Posted (Estimate)

May 13, 2016

Last Update Submitted That Met QC Criteria

May 12, 2016

Last Verified

November 1, 2001

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 4215
  • R01HL046177 (U.S. NIH Grant/Contract)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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