Comparación de resultados obtenidos en el tratamiento del dolor miofascial de la cintura pélvica con toxina botulínica sola y asociada con lidocaína

摘要

Objectives: Between 70 and 85 % of the adult population suffers from back pain sometime in their life. Myofascial pain syndrome (MPS) has been described recently and defined as a localized non-inflammatory musculoskeletal pain, developed without apparent cause, being refractory to pharmacological and physical treatments, and is accompanied by the presence of trigger points and palpable taut bands in the muscle. Its prevalence is estimated to vary between 30 and 85 %. The psoas, quadratus lumborum and pyramidal muscles are the most frequently involved in the pelvic girdle MPS. One of the main alternatives to treat MPS is botulinum toxin type A (BT), which acts in the synaptic membrane at the neuromuscular junction, inhibiting the release of acetylcholine, producing muscle relaxation and pain relief, although in many cases its effect is not evident until several days have passed. Lidocaine is an amide type local anesthetic with an intermediate duration of action, which act by preventing the propagation of nerve impulses by decreasing the permeability of sodium channels. The objective of this study was to test whether adding LA to the BT dose, we got a shortening in the time of the reduction of EVA and improvement in quality of life. Material and methods: The study design was prospective, controlled, longitudinal and randomized in which we have evaluated the evolution of 20 patients randomly divided into two groups. The first group were given BT A type (group T). The second group was treated with BT A type and an additional dose of 2 % lidocaine (group TL). Previously, both groups had responded positively to a test with lidocaine 2 % infiltration of the affected muscle. Monitoring patients was sequentially to 3, 7, 15 and 90 days of treatment performed. For statistical analysis we used an analysis of variance, ANOVA, complemented by Mauchly test for sphericity check and by Greenhouse-Geisser test, with a confidence interval of 95 %, considering p < 0.05 to establish statistical differences. Results: There was statistically significant difference between group EVA TL and TB in the assessment on the third day, just as in the evaluation of Lattinen Index. No significant differences in the other reviews. In both groups there was significant difference in EVA reduction and Lattinen Index improvement at the beginning and end of the study. Conclusions: BT-A presents an alternative to the management of this condition when conservative therapy has failed. Local anesthetics cause a predictable, short and reversible muscle relaxation caused by blocking nerve conduction in nerve endings, while BT acts on the neuronal endings of the motor plate, preventing the release of acetylcholine. Its action is exercised in different places and with different characteristics. The action of local anesthetics is almost instantaneous and short, the TXB action is delayed and long lasting, so both can be complementary and agonists in their final effect.