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Double-blind, multicenter trial comparing acetyl l-carnitine with placebo in the treatment of fibromyalgia patients.

Abstract

OBJECTIVE

Fibromyalgia (FMS) is a chronic syndrome characterized by widespread pain, troubled sleep, disturbed mood, and fatigue. Several analgesic strategies have been evaluated but the results are moderate and inconsistent. Antidepressant agents are now considered the treatment of choice in most patients. It has been recently suggested that FMS may be associated with metabolic alterations including a deficit of carnitine. In this multicenter randomized clinical trial we evaluated the efficacy of acetyl L-carnitine (LAC) in patients with overt FMS.

METHODS

One hundred and two patients meeting the American College of Rheumatology criteria for FMS were randomized into the study. The treatment consisted of 2 capsules/day of 500 mg LAC or placebo plus one intramuscular (i.m.) injection of either 500 mg LAC or placebo for 2 weeks. During the following 8 weeks the patients took 3 capsules daily containing either 500 mg LAC or placebo. The patients were seen during treatment after 2 (visit 3), 6 (visit 4) and 10 weeks (visit 5). The patients were also visited 4 weeks after treatment discontinuation (follow-up visit). Outcome measures included the number of positive tender points, the sum of pain threshold (kg/cm2 or "total myalgic score"), the Short Form 36 (SF36), a 100 mm visual analog scale (VAS) for self-perceived stiffness, fatigue, tiredness on awakening, sleep, work status, depression, and muscular-skeletal pain, and the Hamilton depression scale.

RESULTS

The "total myalgic score" and the number of positive tender points declined significantly and equally in both groups until the 6th week of treatment. At the 10th week both parameters remained unchanged in the placebo group but they continued to improve in the LAC group with a statistically significant between-group difference. Most VAS scores significantly improved in both groups. A statistically significant between-group difference was observed for depression and musculo-skeletal pain. Significantly larger improvements in SF36 questionnaire were observed in LAC than in placebo group for most parameters. Treatment was well-tolerated.

CONCLUSION

Although this experience deserves further studies, these results indicate that LAC may be of benefit in patients with FMS, providing improvement in pain as well as the general and mental health of these patients.

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  • Publisher Full Text
  • Authors+Show Affiliations

    ,

    Rheumatology Unit, University of Verona, Italy.

    , , , , , , , ,

    Source

    MeSH

    Acetylcarnitine
    Depression
    Dose-Response Relationship, Drug
    Double-Blind Method
    Fatigue
    Fibromyalgia
    Health Surveys
    Humans
    Middle Aged
    Pain
    Pain Measurement
    Treatment Outcome
    Vitamin B Complex

    Pub Type(s)

    Journal Article
    Multicenter Study
    Randomized Controlled Trial

    Language

    eng

    PubMed ID

    17543140

    Citation

    TY - JOUR T1 - Double-blind, multicenter trial comparing acetyl l-carnitine with placebo in the treatment of fibromyalgia patients. AU - Rossini,M, AU - Di Munno,O, AU - Valentini,G, AU - Bianchi,G, AU - Biasi,G, AU - Cacace,E, AU - Malesci,D, AU - La Montagna,G, AU - Viapiana,O, AU - Adami,S, PY - 2007/6/5/pubmed PY - 2007/8/31/medline PY - 2007/6/5/entrez SP - 182 EP - 8 JF - Clinical and experimental rheumatology JO - Clin. Exp. Rheumatol. VL - 25 IS - 2 N2 - OBJECTIVE: Fibromyalgia (FMS) is a chronic syndrome characterized by widespread pain, troubled sleep, disturbed mood, and fatigue. Several analgesic strategies have been evaluated but the results are moderate and inconsistent. Antidepressant agents are now considered the treatment of choice in most patients. It has been recently suggested that FMS may be associated with metabolic alterations including a deficit of carnitine. In this multicenter randomized clinical trial we evaluated the efficacy of acetyl L-carnitine (LAC) in patients with overt FMS. METHODS: One hundred and two patients meeting the American College of Rheumatology criteria for FMS were randomized into the study. The treatment consisted of 2 capsules/day of 500 mg LAC or placebo plus one intramuscular (i.m.) injection of either 500 mg LAC or placebo for 2 weeks. During the following 8 weeks the patients took 3 capsules daily containing either 500 mg LAC or placebo. The patients were seen during treatment after 2 (visit 3), 6 (visit 4) and 10 weeks (visit 5). The patients were also visited 4 weeks after treatment discontinuation (follow-up visit). Outcome measures included the number of positive tender points, the sum of pain threshold (kg/cm2 or "total myalgic score"), the Short Form 36 (SF36), a 100 mm visual analog scale (VAS) for self-perceived stiffness, fatigue, tiredness on awakening, sleep, work status, depression, and muscular-skeletal pain, and the Hamilton depression scale. RESULTS: The "total myalgic score" and the number of positive tender points declined significantly and equally in both groups until the 6th week of treatment. At the 10th week both parameters remained unchanged in the placebo group but they continued to improve in the LAC group with a statistically significant between-group difference. Most VAS scores significantly improved in both groups. A statistically significant between-group difference was observed for depression and musculo-skeletal pain. Significantly larger improvements in SF36 questionnaire were observed in LAC than in placebo group for most parameters. Treatment was well-tolerated. CONCLUSION: Although this experience deserves further studies, these results indicate that LAC may be of benefit in patients with FMS, providing improvement in pain as well as the general and mental health of these patients. SN - 0392-856X UR - https://www.unboundmedicine.com/medline/citation/17543140/full_citation/Double_blind_multicenter_trial_comparing_acetyl_l_carnitine_with_placebo_in_the_treatment_of_fibromyalgia_patients_ L2 - http://www.clinexprheumatol.org/pubmed/find-pii.asp?pii=17543140 ER -