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Gabapentin for the Treatment of Spasticity in Patients with Spinal Cord Injury

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Gabapentin for the Treatment of Spasticity in Patients with Spinal Cord Injury Spinal Cord (1997) 35, 686 ± 689 1997 International Medical Society of Paraplegia All rights reserved 1362 ± 4393/97 $12.00 Gabapentin for the treatment of spasticity in patients with spinal cord injury M Gruenthal1, M Mueller2, WL Olson1, MM Priebe3, AM Sherwood4 and WH Olson1 1Departments of Neurology and Internal Medicine, and 2Division of Physical Medicine and Rehabilitation, University of Louisville School of Medicine, Louisville, KY; 3Department of Physical Medicine and Rehabilitation, Baylor College of Medicine and Veterans Aairs Medical Center, Spinal Cord Injury Service, Houston, Texas; 4Division of Restorative Neurology and Neurobiology, Baylor College of Medicine, Houston, Texas. Address reprint requests to Dr Gruenthal at The University of Louisville Department of Neurology, HSC #113, 500 S Preston Street, Louisville, KY 40292, USA. Our serendipitous observations suggested that some patients with spasticity appeared to have improved following the administration of the anticonvulsant drug gabapentin. As some patients with spasticity are either refractory to or intolerant of established medical treatments, we conducted this study to investigate the eect of gabapentin on spasticity in patients with spinal cord injury. Twenty-®ve patients with spinal cord injury and spasticity received oral gabapentin (2400 mg over 48 h) in a randomized, double blind, placebo-controlled crossover study. We assessed responses by measuring the Ashworth spasticity scale, muscle stretch re¯exes, presence of clonus and re¯ex response to noxious stimuli. Patient ratings were obtained using a Likert Scale. Administration of gabapentin, but not placebo, was associated with an 11% reduction in spasticity as measured by the Ashworth Scale (P=0.04) and by a 20% reduction in the Likert Scale (P=0.0013). Signi®cant changes were not obtained for the other measures. The data obtained suggest that gabapentin may be useful in the management of spasticity associated with spinal cord injury. Keywords: spasticity; spinal cord injury; gabapentin Introduction Painful muscle spasms, spasticity and rigidity aect up omy and longitudinal myelotomy. Implantation of to 67% of patients with a severe spinal cord injury.1 pumps for the administration of intrathecal baclofen Painful spasms and increased tone limit rehabilitation had emerged as an eective procedure.9,10 Advantages and the quality of life by interfering with physical of this technique include eectiveness in the absence of therapy, sitting, patient transfers and other activities of dose-limiting adverse eects. Nevertheless, hypoten- daily living. Ambulation may be compromised in sion, weakness and respiratory depression have been patients with incomplete lesions due to pain, decreased reported in placebo-controlled trials.10,11 Complica- range of motion, tone and clonus. Medical therapy for tions include mechanical failure, accidental overdosage spasticity following spinal cord injury has traditionally and infection.9±11 involved orally administered baclofen, dantrolene, Thus, despite available therapies, a treatment benzodiazepines and clonidine.2±4 Baclofen is generally combining the attributes of clinical ecacy, safety, regarded as the drug of choice for spasticity of spinal tolerability and cost-eectiveness is not available for origin. Its ecacy has been demonstrated in placebo all patients with spasticity of spinal cord origin. Our controlled trials.5 It is less of a sedative than diazepam,2 anecdotal experience with gabapentin, a recently and causes less weakness than dantrolene.6 Despite its marketed anticonvulsant, led us to conduct a demonstrated bene®ts, 25 ± 35% of patients do not prospective, double-blind, placebo controlled cross- respond to oral baclofen.7 Furthermore, dose limiting over trial of adjunctive oral gabapentin in the neurotoxic adverse eects such as somnolence, ataxia, treatment of spasticity of spinal cord origin. dizziness and confusion have been noted.2 Tizanidine has demonstrated eectiveness in clinical trials, but is not currently approved for use in North America.8 Methods Surgical treatments for spasticity of spinal origin include tendon lengthening, neurotomy, dorsal rhizot- Patient population Men and women age 18 and older with spinal cord injury were eligible for participation if they had Correspondence: Dr Michael Gruenthal uncontrolled spasticity, were not pregnant, had no Gabapentin for spasticity MGruenthalet al 687 history of renal disease and were able to give informed Table 1. Clinical assessment of spasticity consent. Potential patients were identi®ed in the databases of the Frazier Rehabilitation Center in 1. Ashworth spasticity II. Clonus Louisville, KY and the Veterans Aairs Medical scale Center Spinal Cord Injury Service in Houston, TX Hip flexor Ankle Hip extensor Wrist and contacted by telephone. Patients who described Hip abductor themselves as free of spasms or rigidity were excluded. Hip adductor Knee extensor Knee flexor Study design Ankle dorsiflexor After obtaining Institutional Review Board approval, Ankle plantarflexor informed consent was obtained from all of the patients. Triceps The study consisted of a baseline evaluation (day 1) Bicpes followed by randomization to one of two treatment III. Reflexes IV. Response to noxious arms. One half of the patients received six doses of stimuli gabapentin 400 mg orally in three divided doses per Brachioradialis Nailbed day while the other half received placebo. A repeat Biceps Babinski evaluation was conducted on day 3. Subjects then Triceps underwent an 11 day washout period (days 4 ± 14) Gastrocnemius followed by a third evaluation on day 15. The drug Quadriceps femoris Adductor regimen was then repeated except that the placebo was given to those patients who had previously received gabapentin and vice versa. The ®nal evaluation was conducted on day 17. All evaluations for a given Table 2 Scoring system for clinical assessment patient were conducted at the same time of day and within 5 h of the last dose. A double blind was I. Ashworth spasticity scale II. Clonus maintained throughout the entire study. In addition, 1=Normal, no increase 0=None, normal the examiner was kept unaware of the results of in tone 1=Non-sustained clonus 2=slight increase in tone, 2=Sustained clonus previous examinations for each patient at each giving a `catch' when 3=Spontaneous clonus evaluation. Patients were instructed to continue taking affected part is moved any antispasticity drugs which they were using prior to 3=More marked increase enrollment. Each evaluation consisted of several in tone, but affected measures. Patient ratings of spasticity were measured part easily moved with a six point Likert Scale in which patients were 4=Considerable increase in asked to rate spasms using the categories `none', `mild', tone; passive movement `moderate', `severe', `very severe' or `worst'. Each difficult category was accompanied by a simple diagram of a 5=Affected part rigid, face depicting increasing levels of dissatisfaction. immobile Spasticity was assessed clinically in the right upper III. Reflexes IV. Response to noxious stimuli and lower extremities by a standardized Ashworth 0=Areflexia 0=No response Scale rating, muscle stretch re¯exes, the presence or 1=Hyporeflexia 1=Minimal flexor response absence of clonus in response to rapid ankle 2=Isoreflexia, normal 2=Flexor withdrawal dorsi¯exion and wrist extension, the presence or 3=Hyperreflexia 3=Fully developed triple 4=Hyperreflexia with flexor response absence of re¯ex withdrawal in response to nailbed clonus eliceted pressure to the ®rst ®nger, and assessment of the Babinski response. Table 1 shows the individual components of these tests and Table 2 shows the scoring system used for each measure. Each evaluation Statistical analysis was conducted by the same physician in Louisville and This was a crossover study in which patients were used in Houston who met to develop a uni®ed technique. as their own matched controls for all primary analyses. Patients were assigned at random to receive either We examined the data for dierences in Likert Scale gabapentin or placebo as the initial treatment. rating and in the individual clinical measures shown in Randomization using a random number table and Table 1 Since all data were ordinal, analyses were drug dispensing were done by a pharmacist who had conducted using the Wilcoxon matched pairs ranked no direct contact with the investigators or patients and sum test. The primary analysis was a comparison of no knowledge of any patient's clinical status. Neither results obtained following administration of gabapentin the patients nor the investigators were informed of and placebo. To investigate the eects of possible treatment assignments until the study was completed. variation in individual baseline data as a function of The physical characteristics of the administered the eleven day washout period, data obtained during gabapentin and placebo were identical. treatment (placebo or gabapentin) were also compared Gabapentin for spasticity M Gruenthal et al 688 to baseline data obtained immediately prior to ment order did not aect the data obtained with initiation of that treatment. To investigate possible administration of either placebo or gabapentin. dierences in the scores as a function of treatment Themedianscoresobtainedforeachmeasureare order, unpaired comparisons between patients assigned shown in Table 4. Administration of gabapentin to receive placebo ®rst and gabapentin ®rst were made resulted in an 11% reduction
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