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March 3, 2010
Objective
The objective of our study was to evaluate the effect of intravenous lidocaine on the
manifestations of fibromyalgia.
Methods
A randomized, double-blind, comparative study was conducted on 30 patients. All patients
received 25 mg amitriptyline. Group 1 (n = 15) received 125 mL of saline; group 2 (n = 15)
received 240 mg lidocaine in 125 mL of saline once a week for 4 weeks. The following
parameters were evaluated: clinical manifestations before and 4 weeks after treatment;
pain intensity on a numerical scale.
Results
All patients were female, and the mean age was 44.7 ± 10.5 years in group 1
and 40.9 ± 11.6 years in group 2. No difference in pain intensity or the number of
tender points was observed between groups at any time point. Both groups demonstrated a
significant decrease in the two parameters after treatment. A significant reduction in
sleep disorders, paresthesia, and headache was observed after treatment in the two groups,
but there was no significant difference between groups. There was no significant reduction
in fatigue, subjective edema or morning stiffness after treatment in either group, without
a significant difference between groups.
Conclusion
The addition of 240 mg intravenous lidocaine (once a week) to 25 mg amitriptyline for 4
weeks did not modify pain intensity or manifestations in patients with fibromyalgia
compared with amitriptyline alone.
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