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Opioid Compromise in Hypertension--Modulating Factors

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: May 25, 2000
Last updated: February 17, 2016
Last verified: May 2000
To confirm the preliminary findings of age, race, and hypertension chronicity effects on opioid and cardiovascular responses to stress and to determine the opioid mechanisms mediating these effects using an opioid receptor blockade strategy.

Cardiovascular Diseases Heart Diseases Hypertension

Study Type: Observational

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

Study Start Date: April 1992
Study Completion Date: March 1997
Detailed Description:


Opioids exert depressor effects on cardiovascular responses through sympathetic nervous system inhibition. Research suggests that opioid inhibition of sympathetic activity may be compromised in hypertension. Preliminary studies by the Principal Investigator suggest that the nature of this compromise may be influenced by age and race. Additionally, literature suggests that hypertension chronicity may modulate opioid sympathoinhibitory actions. The receptor mechanisms mediating the observed modulating effects of age, race, and hypertension chronicity on opioidergic inhibition and regulation of blood pressure remained to be determined.


Two double-blind, placebo-controlled cross-over studies were conducted to evaluate the effects of naltrexone hydrochloride, an oral opiate antagonist, on adrenergically-mediated cardiovascular responses in older and younger, Black and White normotensives and hypertensives with varying lengths of hypertension duration. Cardiovascular and opioid responses were measured in response to a stressor combined with either placebo or naltrexone pretreatment. Results from these studies assisted in (a) elucidating opioidergic mechanisms underlying the increased rates of hypertension morbidity and mortality among Blacks and the elderly, and (b) ultimately optimized the design of pharmacological interventions for the prevention and treatment of hypertension.

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


Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria
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No Contacts or Locations Provided
  More Information

Publications: Identifier: NCT00005434     History of Changes
Other Study ID Numbers: 4361
R29HL046218 ( U.S. NIH Grant/Contract )
Study First Received: May 25, 2000
Last Updated: February 17, 2016

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Vascular Diseases processed this record on July 19, 2017