Study on the Effect of a Beta Blocker on Increased Sensitivity to Pain in Humans Caused by Opioids

May 15, 2018 updated by: Larry Fu-nien Chu, Stanford University

Effect of Beta Blockade on Opioid-Induced Hyperalgesia in Humans

This research study explores whether a beta-blocker (propranolol) can prevent a person from becoming more sensitive to pain after administration of an opioid (remifentanil). Beta blockers inhibit the sympathetic (fight or flight) response and are often used to treat angina and high blood pressure. In a previous study in human volunteers, the investigators demonstrated an increased sensitivity to pain after a 60-minute infusion of the opioid remifentanil. The goal of this study is to identify a possible inhibitor of this phenomenon.

Study Overview

Detailed Description

Recent evidence suggests that opioid therapy may cause a biphasic response, i.e. initial pain relief followed paradoxically by a longer lasting hypersensitivity to pain. Recent genetic analysis in mice suggests that beta adrenergic receptor antagonists reduce opiate-induced hyperalgesia (OIH). The purpose of this study is to determine the analgesic and antihyperalgesic properties of the beta-blocker propranolol on remifentanil-induced hypersensitivity in humans.

The investigators want to determine the analgesic and antihyperalgesic properties of the beta-blocker propranolol on remifentanil-induced hypersensitivity in humans. The investigators hope to learn whether the administration of beta-blocker propranolol will significantly diminish the hyperalgesic response after administration of an opioid.

The primary outcome measure for this study is change in size (area) of secondary hyperalgesia after cessation of remifentanil infusion, a measure of OIH.

Study Type

Interventional

Enrollment (Actual)

10

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

    • California
      • Stanford, California, United States, 94305
        • Stanford University School of Medicine

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

18 years to 45 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  1. Healthy men,
  2. Age between 18 and 45 years
  3. Normal weight (according to the table provided by Metropolitan Life Insurance).

Exclusion Criteria:

  1. Hypersensitivity to opioids or naloxone,
  2. History of addictive disease,
  3. Significant cardiac, respiratory, gastrointestinal, neurological, dermatological, and psychiatric diseases,
  4. Concurrent medication with an analgesic drug,
  5. Student and employees affiliated with our laboratory

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?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Propranolol, Then Placebo
Propranolol, a beta blocker, or placebo to match, will be given to test whether or not it could modulate the expression of remifentanil-induced postinfusion hyperalgesia (RPH) during two pain test including: mechanically evoked pain to map the size of the hyperalgesic skin region caused by electrical stimulation and heat pain.
Propranolol administered intravenously, initially set to target plasma concentration of 5 ng/mL, titrated upward in 5 ng/mL intervals until a final concentration of 15 ng/mL is achieved.
Other Names:
  • Inderal
  • Hemangeol
  • Innopran
Remifentanil administered intravenously at a plasma concentration of 3 ng/mL.
Placebo Comparator: Placebo, Then Propranolol
Propranolol, a beta blocker, or placebo to match, will be given to test whether or not it could modulate the expression of remifentanil-induced postinfusion hyperalgesia (RPH) during two pain test including: mechanically evoked pain to map the size of the hyperalgesic skin region caused by electrical stimulation and heat pain.
Propranolol administered intravenously, initially set to target plasma concentration of 5 ng/mL, titrated upward in 5 ng/mL intervals until a final concentration of 15 ng/mL is achieved.
Other Names:
  • Inderal
  • Hemangeol
  • Innopran
Remifentanil administered intravenously at a plasma concentration of 3 ng/mL.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Percent Change From Baseline in Size (Area) of Secondary Hyperalgesia After Cessation of Remifentanil Infusion, a Measure of Opioid-induced Hyperalgesia (OIH).
Time Frame: Baseline; 15 min post remifentanil (REM) infusion; 60 min post REM infusion
A slightly modified version of a previously described model of secondary hyperalgesia was used. Two copper wires contained in a microdialysis catheter were inserted in parallel over a length of 5 mm into the dermis of the right volar forearm. The wires were connected to a constant current stimulator controlled by a pulse generator to deliver rectangular and monophasic pulses with a duration of 0.5 mg at 2 Hz. Over a period of 15 min, the current was increased by targeting a pain rating of 5 on an 11-point numeric rating scale (0 = no pain and 10 = maximum tolerable pain) until the hyperalgesic area surrounding the stimulation site was fully established. Once the area was established, the current was held constant. Percent change from baseline in size (area) of secondary hyperalgesia after cessation of remifentanil infusion was calculated per group.
Baseline; 15 min post remifentanil (REM) infusion; 60 min post REM infusion

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Objective Opioid Withdrawal Scale (OOWS)
Time Frame: Pretreatment [90 min prior to 60-min REM infusion]; 30 min prior to 60-min REM infusion; 15 and 40 min after start of 60-min REM infusion; 5, 15, and 75 minutes after finish of 60-min REM infusion)
OOWS: Is a 13-item instrument of documenting physically observable signs of withdrawal, which are rated as present (1) or absent (0) during the observation period. Maximum score = 13, minimum score = 0. Lower scores correspond to fewer symptoms.
Pretreatment [90 min prior to 60-min REM infusion]; 30 min prior to 60-min REM infusion; 15 and 40 min after start of 60-min REM infusion; 5, 15, and 75 minutes after finish of 60-min REM infusion)

Collaborators and Investigators

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

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

February 1, 2009

Primary Completion (Actual)

May 1, 2011

Study Completion (Actual)

June 1, 2011

Study Registration Dates

First Submitted

October 14, 2010

First Submitted That Met QC Criteria

October 15, 2010

First Posted (Estimate)

October 18, 2010

Study Record Updates

Last Update Posted (Actual)

June 15, 2018

Last Update Submitted That Met QC Criteria

May 15, 2018

Last Verified

May 1, 2018

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

No

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

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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