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Created August 15, 2015, last updated almost 4 years ago.
Collection: 40, Score: 1673, Trend score: 0, Read count: 1940, Articles count: 15, Created: 2015-08-15 08:32:37 UTC. Updated: 2021-02-08 00:12:36 UTC.Notes
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Collected Articles
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Randomized Controlled Trial
Absence of long-term analgesic effect from a short-term S-ketamine infusion on fibromyalgia pain: a randomized, prospective, double blind, active placebo-controlled trial.
To assess the analgesic efficacy of the N-methyl-D-aspartate receptor antagonist S(+)-ketamine on fibromyalgia pain, the authors performed a randomized double blind, active placebo-controlled trial. Twenty-four fibromyalgia patients were randomized to receive a 30-min intravenous infusion with S(+)-ketamine (total dose 0.5mg/kg, n=12) or the active placebo, midazolam (5mg, n=12). Visual Analogue Pain Scores (VAS) and ketamine plasma samples were obtained for 2.5-h following termination of treatment; pain scores derived from the fibromyalgia impact questionnaire (FIQ) were collected weekly during an 8-week follow-up. ⋯ Side effects as measured by the Bowdle questionnaire (which scores for 13 separate psychedelic symptoms) were mild to moderate in both study groups and declined rapidly, indicating adequate blinding of treatments. Efficacy of ketamine was limited and restricted in duration to its pharmacokinetics. The authors argue that a short-term infusion of ketamine is insufficient to induce long-term analgesic effects in fibromyalgia patients.
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Case Reports Randomized Controlled Trial Comparative Study
Drug-induced liver injury following a repeated course of ketamine treatment for chronic pain in CRPS type 1 patients: a report of 3 cases.
Studies on the efficacy of ketamine in the treatment of chronic pain indicate that prolonged or repetitive infusions are required to ensure prolonged pain relief. Few studies address ketamine-induced toxicity. Here we present data on the occurrence of ketamine-induced liver injury during repeated administrations of S(+)-ketamine for treatment of chronic pain in patients with complex regional pain syndrome type 1 as part of a larger study exploring possible time frames for ketamine re-administration. ⋯ In all patients, the ketamine infusion was promptly terminated and the liver enzymes slowly returned to reference values within 2 months. Our data suggest an increased risk for development of ketamine-induced liver injury when the infusion is prolonged and/or repeated within a short time frame. Regular measurements of liver function are therefore required during such treatments.
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Randomized Controlled Trial
Pain relief is associated with improvement in motor function in complex regional pain syndrome type 1: secondary analysis of a placebo-controlled study on the effects of ketamine.
There are indications of motor circuit changes in patients with complex regional pain syndrome (CRPS). Nevertheless, although several studies have analyzed motor behavior in CRPS, a relation with pain could not be detected. This might be explained by the use of cross-sectional designs in these studies, in which pain is considered as a trait- rather than a state-dependent variable. We therefore studied the time-dependent relation between pain and motor function in affected arms of 29 CRPS patients during their participation in a placebo-controlled ketamine study. Movement parameters (velocity, frequency, amplitude, and number of arrests) were assessed during a finger tapping task. Linear mixed model analysis of the effects of pain (numerical rating scale score), treatment (ketamine/placebo), and week (1, 3, 6, and 12 weeks after treatment) on the movement parameters revealed that pain intensity was significantly (inversely) related to motor function, irrespective of whether patients had received ketamine or placebo. Movement parameters changed 3-12% per point numerical rating scale change. Because patients were unaware of possible effects of ketamine on motor function, these findings suggest that motor function changes were mediated by, or occurred simultaneously with, changes in pain intensity. By improving motor function, pain relief may offer a window of opportunity for rehabilitation programs in CRPS. ⋯ This article provides evidence for a direct relation between pain and motor function in CRPS, which indicates that pain relief may be an important factor in the treatment of motor disturbances in this condition. These findings may help to advance our understanding of the pathways underlying motor disturbances in CRPS.
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Pediatric emergency care · Aug 2017
Ketamine Abuse Syndrome: Hepatobiliary and Urinary Pathology Among Adolescents in Flushing, NY.
Ketamine is a recreational drug widely abused in East Asia and also in certain subpopulations of the United States. Many US clinicians are unaware of abuse symptoms, leading to misdiagnosis and missed opportunities for intervention. We will discuss clinical patterns that should alert a clinician to the possibility of ketamine abuse. ⋯ Ketamine abuse is associated with a distinctive pattern of symptoms involving the urinary and hepatobiliary systems.
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This systematic review aims to examine the available literature and to synthesize published data concerning the treatment of Complex Regional Pain Syndrome (CRPS) with ketamine. ⋯ There is no high quality evidence available evaluating the efficacy of ketamine for CRPS and all manuscripts examined in this review were of moderate to low quality. Therefore, we conclude there is currently only weak evidence supporting the efficacy of ketamine for CRPS, yet there is clearly a rationale for definitive study.
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Ketamine is a lipophilic, general anesthetic. When given at subanesthetic doses, it also has been found to be an effective analgesic, with efficacy in cancer-associated neuropathic pain, ischemic pain, and regional pain syndromes. ⋯ Ketamine is metabolized via cytochrome P450 3A4, although no significant interactions have been reported. Ketamine is considered one of the World Health Organization (WHO) essential drugs for the management of refractory pain.
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This work summarizes the efficiency, failures and adverse effects of oral administration of ketamine at home for intractable pain. ⋯ Pain was reduced or abolished in two-thirds of patients under ketamine therapy; ketamine was effective for patients taking opioids and resulted in few adverse effects.
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We evaluated whether outpatient intravenous ketamine infusions were satisfactory for pain relief in patients suffering from various chronic intractable pain syndromes. ⋯ We conclude that in patients with severe refractory pain of multiple etiologies, subanesthetic ketamine infusions may improve VAS scores. In half of our patients, relief lasted for up to 3 weeks with minimal side effects.
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Acta Anaesthesiol Scand · Nov 2014
Review Meta AnalysisA systematic review and meta-analysis of ketamine for the prevention of persistent post-surgical pain.
While post-operative pain routinely resolves, persistent post-surgical pain (PPSP) is common in certain surgeries; it causes disability, lowers quality of life and has economic consequences. The objectives of this systematic review and meta-analysis were to evaluate the effectiveness of ketamine in reducing the prevalence and severity of PPSP and to assess safety associated with its use. We searched the Cochrane Central Register of Controlled Trials, MEDLINE and EMBASE through December 2012 for articles in any language. ⋯ The study data from our review are heterogeneous and demonstrate efficacy of intravenously administered ketamine only in comparison with placebo. Highly variable timing and dosing of ketamine in these studies suggest that no unifying effective regimen has emerged. Future research should focus on clinically relevant outcomes, should stratify patients with pre-existing pain and possible central sensitization and should enroll sufficiently large numbers to account for loss to follow-up in long-term studies.
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Acta Anaesthesiol Scand · Aug 2003
Randomized Controlled Trial Clinical TrialThe effectiveness of intravenous ketamine and lidocaine on peripheral neuropathic pain.
Neuropathic pain is often severe and resistant to pharmacological treatment. The aims of the present study were to assess the analgesic effect of ketamine and lidocaine and to investigate if measurement of different variables of sensibility could be used to identify responders. We also wanted to study if treatment resulted in changes of sensibility. ⋯ Ketamine showed a significant analgesic effect. The clinical usefulness is, however, limited by disturbing side-effects.
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Randomized Controlled Trial Multicenter Study
The analgesic efficiency of combined pregabalin and ketamine for total hip arthroplasty: a randomised, double-blind, controlled study.
Pregabalin and ketamine given together have a small, additive effect in reducing post-operative pain after total hip arthroplasty.
pearl -
Anesthesia and analgesia · Jul 2019
Meta AnalysisKetamine Infusions for Chronic Pain: A Systematic Review and Meta-analysis of Randomized Controlled Trials.
Why?
Although often used to manage chronic pain acutely, the longer-term benefits of ketamine infusions remain uncertain. Despite this there has been significant growth in using ketamine infusions to treat chronic pain, rationalised by ketamine’s expected effect to reduce central sensitisation.
What?
This meta-analysis identified a small benefit for up to two weeks after a ketamine infusion, although little evidence of longer-term benefit. There appears to be a dose-response effect, suggesting greater efficacy with high-dose ketamine infusions.
The underlying problem...
Most research on ketamine infusions focuses on perioperative analgesia. Trials invetsigating ketamine infusions for chronic pain are universally small, lack standardisation and are often low quality.
This meta-analysis unfortunately does not add clarity to the question of whether ketamine infusions have long-term benefit in chronic pain syndromes. Clinicians will continue to need to judge indication on a case-by-case basis...
summary
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