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Effect of Ketamine on Opioid-Induced Hyperalgesia

2014-08-27 03:24:40 | BioPortfolio

Summary

The purpose of this study is to compare pain threshold, pain tolerance, and wind up, as measured by QST, before and after a single dose of ketamine infusion under two clinical conditions: chronic pain patients on opioid therapy and chronic pain patients without opioid therapy.

Description

We hypothesize that:

1. Chronic pain patients on chronic opioids would have a lower pain threshold and lower pain tolerance when compared to opioid naïve patients (patients with chronic pain with non-opioids treatment)., as measured by QST in a non-affected neutral limb;

2. Chronic pain patients on chronic opioids would have an increased response to painful stimulation, so called "windup" as demonstrated by QST;

3. Both "wind-up" and altered pain threshold and tolerance would be indicative of the presence of opioid-induced hyperalgesia;

4. Intravenous ketamine, an NMDA receptor antagonist, could be used to differentiate between opioid-induced hyperalgesia and opioid tolerance.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Health Services Research

Conditions

Pain

Intervention

Ketamine

Location

Massachusetts General Hospital
Boston
Massachusetts
United States
02114

Status

Recruiting

Source

Massachusetts General Hospital

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:24:40-0400

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Medical and Biotech [MESH] Definitions

A cyclohexanone derivative used for induction of anesthesia. Its mechanism of action is not well understood, but ketamine can block NMDA receptors (RECEPTORS, N-METHYL-D-ASPARTATE) and may interact with sigma receptors.

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Pain in the facial region including orofacial pain and craniofacial pain. Associated conditions include local inflammatory and neoplastic disorders and neuralgic syndromes involving the trigeminal, facial, and glossopharyngeal nerves. Conditions which feature recurrent or persistent facial pain as the primary manifestation of disease are referred to as FACIAL PAIN SYNDROMES.

Dull or sharp aching pain caused by stimulated NOCICEPTORS due to tissue injury, inflammation or diseases. It can be divided into somatic or tissue pain and VISCERAL PAIN.

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