Intra-operative Ketamine Infusions in Opioid-dependent Patients With Chronic Lower Back Pain

This study has been completed.
Information provided by (Responsible Party):
Dartmouth-Hitchcock Medical Center Identifier:
First received: May 8, 2009
Last updated: May 3, 2013
Last verified: May 2013

Noxious stimuli occurring intraoperatively and postoperatively generate central sensitization, decreasing pain thresholds and ultimately increasing analgesic requirements. The pathophysiology of central sensitization is thought to involve excitatory amino acid receptors such as N-methyl-d-aspartate (NMDA) (1, 2). Ketamine is a N-methyl-d-aspartate (NMDA) receptor antagonist that has been shown to be useful in the reduction of acute postoperative pain and analgesic consumption in a variety of surgical interventions (3).

Spine surgery provides a unique opportunity to evaluate the preemptive and preventative impact of ketamine on the primary end points of postoperative 24 and 48 hour opioid consumption in patients with chronic pain. The goal of this IRB approved double blinded, prospective, randomized placebo controlled trial is to quantify the preemptive and preventative analgesic effects of ketamine infusions in this patient population. Such insight may lead to better pain control, improved satisfaction, and ultimately a reduction in side-effects related to postoperative opioid use.

Condition Intervention
Chronic Low Back Pain
Drug: Ketamine
Other: Normal saline

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Intra-operative Ketamine Infusions in Patients With Chronic Lower Back Discomfort Undergoing Laminectomies.

Resource links provided by NLM:

Further study details as provided by Dartmouth-Hitchcock Medical Center:

Primary Outcome Measures:
  • Morphine Consumption in the First 48 Hours After Surgery [ Time Frame: 48 hours ] [ Designated as safety issue: No ]
    Total morphine(mg)consumed at 48 hours.

Secondary Outcome Measures:
  • Hospital Duration [ Time Frame: 24 and 48 hours ] [ Designated as safety issue: No ]
  • Mortality [ Time Frame: 1 year ] [ Designated as safety issue: No ]
  • Hemodynamic Changes [ Time Frame: 24 and 48 hours ] [ Designated as safety issue: No ]
  • Complications Related to Ketamine [ Time Frame: 24 and 48 hours ] [ Designated as safety issue: No ]

Enrollment: 102
Study Start Date: February 2007
Study Completion Date: April 2009
Primary Completion Date: April 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: Normal saline Other: Normal saline
Normal saline at same rate as the previously described ketamine infusion (10mcg/kg/min), same amount of ketamine/placebo syringe on induction (0.5mg/kg).
Experimental: Ketamine Drug: Ketamine
Peripheral provision of 0.5mg/kg of ketamine on induction followed by a 10mcg/kg/min infusion until surgical wound closure

  Show Detailed Description


Ages Eligible for Study:   18 Years to 90 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Laminectomy procedures.
  • History of chronic back pain.
  • Daily opioid use.
  • Capable of providing informed consent.

Exclusion Criteria:

  • Intolerance/allergy to ketamine.
  • Intolerance/true allergy to morphine.
  • Elevated intra-ocular pressure.
  • Uncontrolled hypertension.
  • Elevated intra-cranial pressure.
  • Any history of a psychosis.
  • Pregnancy.
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Please refer to this study by its identifier: NCT00899600

United States, New Hampshire
Dartmouth-Hitchcock Medical Center
Lebanon, New Hampshire, United States, 03756
Sponsors and Collaborators
Dartmouth-Hitchcock Medical Center
Principal Investigator: Jeffrey A Clark, MD DHMC
  More Information

No publications provided

Responsible Party: Dartmouth-Hitchcock Medical Center Identifier: NCT00899600     History of Changes
Other Study ID Numbers: 100674
Study First Received: May 8, 2009
Results First Received: November 27, 2012
Last Updated: May 3, 2013
Health Authority: United States: Institutional Review Board

Keywords provided by Dartmouth-Hitchcock Medical Center:
chronic pain
back surgery
opioid dependent
NMDA receptor antagonism
Central sensitization

Additional relevant MeSH terms:
Anesthetics, Dissociative
Anesthetics, General
Anesthetics, Intravenous
Central Nervous System Agents
Central Nervous System Depressants
Excitatory Amino Acid Agents
Excitatory Amino Acid Antagonists
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Sensory System Agents
Therapeutic Uses processed this record on March 26, 2015