Lidocaine on Manifestations of Fibromyalgia (LIMAFIBRO)
Background and Objectives: Fibromyalgia is a pain syndrome characterized by numerous manifestations. The objective of this study was to evaluate the effect of the combination of intravenous lidocaine and amitriptyline on the manifestations of fibromyalgia. Methods: A prospective, randomized, double-blind, comparative study was conducted. All patient received 25 mg amitriptyline. Patients of group 1 (n = 15) received 125 mL 0.9% saline, and patients of group 2 (n = 15) received 240 mg lidocaine in 125 mL 0.9% saline once a week for 4 weeks. Manifestations were recorded before and 4 weeks after treatment. Pain intensity was rated on a verbal numerical scale.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Treatment
|Official Title:||Effect of Intravenous Lidocaine on Manifestations of Fibromyalgia|
- effect of the combination of intravenous lidocaine and amitriptyline on the clinical manifestations of fibromyalgia [ Time Frame: 4 weeks ] [ Designated as safety issue: Yes ]
- Pain intensity by numerical scale (0 - 10)where 0 being an absent of pain and 10 measuring as the highest for pain intensity [ Time Frame: 4 weeks ] [ Designated as safety issue: Yes ]
|Study Start Date:||January 2005|
|Study Completion Date:||September 2008|
|Primary Completion Date:||July 2007 (Final data collection date for primary outcome measure)|
Patients received 240 mg lidocaine diluted in 125 mL 0.9% saline. The solutions were infused over a period of 1 h, once a week, for 4 weeks (T1, T2, T3 and T4).
received 240 mg lidocaine diluted in 125 mL 0.9% saline.
Amitriptyline was chosen in the present study because it is the most widely used antidepressant with proven analgesic efficacy for the treatment of a variety of chronic pain syndromes. Amitriptyline also promotes improvement of sleep, an effect observed in the present study.
Lidocaine has been widely applied by the intravenous route and patients with a variety of pain syndromes, including fibromyalgia, have reported pain relief with this technique.The dose of lidocaine employed by various investigators ranges from 1 to 5 mg/kg administered over a period of 30-60 min. The minimum effective dose is 1.5 mL/L, which is achieved with 2-5 mg/kg infused over 30-60 min. In these study, 240 mg lidocaine was administered, corresponding to about 3 mg/kg.