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ORIGINAL ARTICLE
Year : 2009  |  Volume : 57  |  Issue : 3  |  Page : 300-303

The efficacy and safety of gabapentin in carpal tunnel patients: Open label trial


Ayhan Varlibas, Kirikkale University, Faculty of Medicine, Department of Neurology, Kirikkale, 07100, Turkey

Date of Acceptance12-Mar-2009
Date of Web Publication8-Jul-2009

Correspondence Address:
A Kemal Erdemoglu
Kirikkale University, Faculty of Medicine, Department of Neurology, Kirikkale, 07100
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0028-3886.53287

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 » Abstract 

Background: Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy caused by median nerve compression at the wrist. It results in loss of considerable man days and the effectiveness the various treatment modalities are still debated. Aim: To study the efficacy of gabapentin in patients with CTS. The study aim is to investigate the efficacy of gabapentin in patients with CTS patients who were refractory to the other conservative measures or unwilling for the surgical procedure. Materials and Methods: Forty one patients diagnosed as idiopathic CTS were included in the study. Patients were assessed with symptom severity scale (SSS) and functional status scale (FSS) scores of Boston Carpal Tunnel Questionnaire (BCTQ) before and at 1, 3, and 6 months of the treatment. Response to therapy was determined by using SSS and FSS scores of BCTQ. Results: The median dosage of gabapentin was 1800 mg/daily. Side effects were mild and transient. There was a statistically significant difference in both symptom SSS and FSS scores between before and after treatment in patient groups at the end of six months (P < 0.001). According to grading the changes in subscales of BCTQ, of 41 patients, 34.1 and 29.3 had a ≥ 40% decrease in SSS and FSS, respectively. Conclusion: Gabapentin was found to be partially effective and safe in symptomatic treatment of CTS patients.


Keywords: Carpal tunnel syndrome, gabapentin, boston carpal tunnel questionnaire


How to cite this article:
Erdemoglu A K. The efficacy and safety of gabapentin in carpal tunnel patients: Open label trial. Neurol India 2009;57:300-3

How to cite this URL:
Erdemoglu A K. The efficacy and safety of gabapentin in carpal tunnel patients: Open label trial. Neurol India [serial online] 2009 [cited 2021 Jan 24];57:300-3. Available from: https://www.neurologyindia.com/text.asp?2009/57/3/300/53287



 » Introduction Top


Carpal tunnel syndrome (CTS) is the most common type of entrapment neuropathy caused by median nerve compression at the wrist. It results in significant functional disabilities. Conservative treatment is often preferred treatment of choice. The effectiveness of other treatment modalities, topical injections and surgery, is still debated. [1] Conservative treatment includes: Splints, nonsteroidal anti-inflammatory drugs (NSAIDs), physical therapy, and ergonomic modifications. However the efficacy of these treatments is limited and recurrence of symptoms is common. [1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12],[13] Surgery is indicated only when signs and symptoms of CTS are persistent and interfere with the quality of life.[14],[15] Surgery may not be acceptable for many patients.

Gabapentin, an antiepileptic drug (ADE), is prescribed in various types of neuropathic pain conditions such as diabetic neuropathy, postherpetic neuralgia, plexopathies, and radiculopathies. [16],[17],[18],[19] This study evaluates the efficacy of gabapentin in the symptom alleviation in patients with CTS.


 » Materials and Methods Top


We studied 41 consecutive patients with CTS (37 women and 4 men, mean age 42.68 ± 9.43 years, range, 28 - 60 years). Patients with isolated CTS were included in the study and patients with CTS in the setting of other neurological diseases were excluded. The protocol was approved by the local ethics committee of our institution, and the informed consent was obtained from all study participants.

Clinical diagnosis of CTS was based on the American Academy of Neurology diagnostic criteria [2] Comprehensive medical and neurological evaluations were performed to exclude neuropathies of other etiologies. Electrophysiological diagnosis of CTS was based on the criteria proposed by the American Academy of Neurology. [2]

Boston carpal tunnel questionnaire (BCTQ), a self-administered disease-specific outcome instrument, was used to assess the severity of symptoms and the functional status. [20] The BCTQ has two subscales evaluating the clinical symptoms (symptom severity scale, SSS) and functional handicap (functional status scale, FSS). Symptom severity scale evaluates symptoms like pain, numbness, weakness, paraesthesia, or clumsiness using 11 questions. Functional status scale evaluates difficulties with daily activities like writing, buttoning clothes, holding a book while reading, gripping a telephone handle, opening jars, household chores, carrying grocery bags, and bathing/ dressing using eight questions. All answers were summed and the mean scores were calculated. The BCTQ has been validated into Turkish in a preliminary study recently. [21]

Treatment and dosage

Patients were started on gabapentin 300 mg/day initially and were advised to attend the clinic at weekly interval for titrating the drug dose. The drug dosage was titrated to a maximum of 3600 mg/day according to the tolerance of patients. The possible side effects were also monitored to assess the safety of the drug. Patients were asked to report or visit the clinic if any adverse effects appeared during the study period.

Patients with the following conditions were excluded from the prescription of the drug: (1) known contraindication to or prior use of any AEDs; (2) creatinin clearance <30 mL min or elevated liver enzymes, (3) clinically significant cardiovascular, renal, or hepatic disease; (4) history of narcotic or alcohol abuse; and (5) previous CTS surgery.

Patients were asked to visit the clinic at 1, 3, and 6 months after the initial evaluation and the initiation of the gabapentin treatment. At every visit, patients were clinically evaluated and were asked to complete BCTQ to evaluate the efficacy of the treatment.

Statistical analysis

In statistical analysis, student's t test, paired t test were used to compare the variables. The level of statistical significance was P < 0.05.


 » Results Top


Patient characteristics

Of the 47 evaluated patients, 6 patients were excluded by the exclusion criteria. There were 35 females, mean age was 42.7 years (range, 28-60) and mean duration of symptoms was 20.7 ± 15.59 months (range 7-72) [Table 1].

Clinical findings

The symptoms were right hand in 18, left hand in 16 and both the hands in 7. In 19 patients paresthesiae were present in the first three fingers and in 22 patients it was in all the fingers. Most of the patients had numbness, tingling (97.6%), and nocturnal worsening of symptoms (92.7%) as the initial presentation [Table 2]. Almost 49% patients had numbness in the distribution of the median nerve. Phalen's maneuver was positive in 80.5% patients and Tinel's sign was positive in 70.7% patients.

Boston carpal tunnel questionnaire findings

The BCTQ subscale scores before the initiation of gabapentin and at the end of 1, 3, and 6 months are shown in [Table 3] and [Table 4]. There was a significant decline in the SSS scores at the end of third and six months of treatment [Table 3] and [Table 4]. Similarly the decline in the FSS scores was significant at the end of the study [Table 3] and [Table 4].

Dosage and compliance

The median dose of gabapentin was 1800 (range: 900-3600 mg). Drug dosage was titrated up to 3600 mg unless there were side effects at such levels. All subjects who completed the first three months of study were considered to have a good compliance to the treatment. Side effects observed were: Gastrointestinal disturbance ( n : 8) and drowsiness ( n : 3). Gastrointestinal disturbance and drowsiness were the most common side effects in the first month of treatment. Although side effects were seen in 26.8% of patients, most of them were mild and tolerable.


 » Discussion Top


This study clearly shows the efficacy and safety of gabapentin in the symptomatic treatment of CTS. We used the most objective BCTQ symptom severity and functional interference subscores to evaluate the efficacy of the drug. There have been a number of clinical studies showing the efficacy of gabapentin in neuropathic pain such as trigeminal neuralgia and postherpetic neuralgias., [16],[17],[18],[19] Only two studies evaluated the efficacy of gabapentin in the symptomatic treatment of CTS.[22],[23] Duman et al . [22] reported an improvement in the symptoms in 21 patients with CTS patients treated for three months. The mean dosage of gabapentin was 648.00 ± 112.25 mg/d (range, 600-900 mg/d), a lower dosage than this study. Taverner et al . [23] found improvement and/or remission of symptoms in 84.2% of patients with CTS treated with gabapentin for six mont The recommended dose of gabapentin in patients with epilepsy is 900-3600 mg/ day. We initiated the patients with a dosage of 300 mg/ day and increased up to 3600 mg according to the patient's tolerance and requirement. The side effects in our study were transient and mild.

Antiepileptic drugs have been widely used in the treatment of neuropathic pain for the reason that the fundamental mechanisms being similar with some epilepsy and neuropathic pain models. However there is a limited understanding of the mechanism of action of these agents. Antiepileptic drugs depress abnormal neuronal discharges and raise the threshold for neural impulse propagation. Recent studies have shown the efficacy of new AEDs such as pregabalin, lamotrigine, and gabapentin in neuropathic pain. Gabapentin has been shown to provide significant analgesia in several neuropathic pain conditions, including trigeminal neuralgia and peripheral diabetic neuropathy, and may also be effective in treating neuropathic pain refractory to other antiepileptics. [16],[17],[18],[19] Gabapentin acts on modulating voltage-dependent calcium channels and glutamate uptake, the mechanism by which gabapentin relieves pain is under investigation.

The major limitation of this study was not having a control arm. This would have allowed us to study the placebo effect on various parameters studied. However our study is the only study that has shown the longterm efficacy and safety of gabapentin in the symptomatic treatment of CTS. We feel that gabapentin can be the drug in patients with persistent symptoms who are reluctant to have surgery and also in patients with persistent symptoms following surgery.

 
 » References Top

1.Verdugo RJ, Salinas RS, Castillo J, Cea JG. Surgical versus non-surgical treatment for carpal tunnel syndrome. Cochrane Database Syst Rev 2003;(3): CD001552.  Back to cited text no. 1  [PUBMED]  [FULLTEXT]
2.Practice parameter for carpal tunnel syndrome (summary statement). Report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology 1993;43:2406-9.  Back to cited text no. 2  [PUBMED]  
3.Chang MH, Chiang HT, Lee SS, Ger LP, Lo YK. Oral drug of choice in carpal tunnel syndrome. Neurology 1998;51:390-3.  Back to cited text no. 3  [PUBMED]  
4.Dammers JW, Veering MM, Vermeulen M. Injection with methylprednisolone proximal to the carpal tunnel: Randomised double blind trial. BMJ 1999;319:884-6.  Back to cited text no. 4  [PUBMED]  [FULLTEXT]
5.Garfinkel MS, Singhal A, Katz WA, Allan DA, Reshetar R, Schumacher HR Jr. Yoga-based intervention for carpal tunnel syndrome: A randomized trial. JAMA 1998;280:1601-3.  Back to cited text no. 5  [PUBMED]  [FULLTEXT]
6.Herskovitz S, Berger AR, Lipton RB. Low-dose, short-term oral prednisone in the treatment of carpal tunnel syndrome. Neurology 1995;45:1923-5.  Back to cited text no. 6  [PUBMED]  
7.O'Gradaigh D, Merry P. Corticosteroid injection for the treatment of carpal tunnel syndrome. Ann Rheum Dis 2000;59:918-9.  Back to cited text no. 7  [PUBMED]  [FULLTEXT]
8.Ayhan-Ardic FF, Erdem HR. Long term clinical and electrophysiological results of local steroid injection in patients with carpal tunnel syndrome. Funct Neurol 2000;15:157-65.  Back to cited text no. 8    
9.Oztas O, Turan B, Bora I, Karakaya MK. Ultrasound therapy effect in carpal tunnel syndrome. Arch Phys Med Rehabil 1998;79:1540-4.  Back to cited text no. 9  [PUBMED]  [FULLTEXT]
10.Rozmaryn LM, Dovelle S, Rothman ER, Gorman K, Olvey KM, Bartko JJ. Nerve and tendon gliding exercises and the conservative management of carpal tunnel syndrome. J Hand Ther 1998;11:171-9.  Back to cited text no. 10  [PUBMED]  
11.Spooner GR, Desai HB, Angel JF, Reeder BA, Donat JR. Using pyridoxine to treat carpal tunnel syndrome Randomized control trial. Can Fam Physician 1993;39:2122-7.  Back to cited text no. 11  [PUBMED]  [FULLTEXT]
12.Walker WC, Metzler M, Cifu DX, Swartz Z. Neutral wrist splinting in carpal tunnel syndrome: A comparison of night-only versus full-time wear instructions. Arch Phys Med Rehab 2000;81:424-9.  Back to cited text no. 12    
13.Wong SM, Hui AC, Tang A, Ho PC, Hung LK, Wong KS, et al. Local vs systemic corticosteroids in the treatment of carpal tunnel syndrome. Neurology 2001;56:1565-7.  Back to cited text no. 13  [PUBMED]  [FULLTEXT]
14.Duncan KH, Lewis RC Jr, Foreman KA, Nordyke MD. Treatment of carpal tunnel syndrome by members of the American Society for Surgery of the Hand: Results of a questionnaire. J Hand Surg [Am] 1987;12:384-91.  Back to cited text no. 14  [PUBMED]  
15.DeStefano F, Nordstrom DL, Vierkant RA. Long-term symptom outcomes of carpal tunnel syndrome and its treatment. J Hand Surg [Am] 1997;22:200-10.  Back to cited text no. 15  [PUBMED]  
16.Backonja M, Beydoun A, Edwards KR, Schwartz SL, Fonseca V, Hes M, LaMoreaux L, Garofalo E. Gabapentin for the symptomatic treatment of painful neuropathy in patients with diabetes mellitus: A randomized controlled trial. JAMA 1998;280:1831-6.  Back to cited text no. 16  [PUBMED]  [FULLTEXT]
17.Coderre TJ, Kumar N, Lefebvre CD, Yu JS. Evidence that gabapentin reduces neuropathic pain by inhibiting the spinal release of glutamate. J Neurochem 2005;94:1131-9.  Back to cited text no. 17  [PUBMED]  [FULLTEXT]
18.Nicholson B. Gabapentin use in neuropathic pain syndromes. Acta Neurol Scand 2000;101:359-71.  Back to cited text no. 18  [PUBMED]  [FULLTEXT]
19.Rowbotham M, Harden N, Stacey B, Bernstein P, Magnus-Miller L. Gabapentin for the treatment of postherpetic neuralgia: A randomized controlled trial. JAMA 1998;280:1837-42.  Back to cited text no. 19  [PUBMED]  [FULLTEXT]
20.Levine DW, Simmons BP, Koris MJ, Daltroy LH, Hohl GG, Fossel AH, et al. A self-administered questionnaire for the assessment of severity of symptoms and functional status in carpal tunnel syndrome. Bone Joint Surg Am 1993;75:1585-92.  Back to cited text no. 20    
21.Heybeli N, Kutluhan S, Demirci S, Kerman M, Mumcu EF. Assessment of outcome of carpal tunnel syndrome: A comparison of electrophysiological findings and a self-administered Boston questionnaire. J Hand Surg [Br] 2002;27:259-64.  Back to cited text no. 21  [PUBMED]  [FULLTEXT]
22.Duman I, Aydemir K, Ozgul A, Kalyon TA. Assessment of the Efficacy of Gabapentin in Carpal Tunnel Syndrome. J Clin Rheumatol 2008;14:175-7.  Back to cited text no. 22  [PUBMED]  [FULLTEXT]
23.Taverner D, Lisbona MP, Segalιs N, Docampo E, Calvet J, Castro S, Benito P. [Efficacy of gabapentin in the treatment of carpal tunnel syndrome]. Med Clin (Barc) 2008;130:371-3.  Back to cited text no. 23    



 
 
    Tables

  [Table 1], [Table 2], [Table 3], [Table 4]

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