Two-dimensional ultrasound and ultrasound elastography imaging of trigger points in women with myofascial pain syndrome treated by acupuncture and electroacupuncture: a double-blinded randomized controlled pilot study.

Chronic pain has been often associated with myofascial pain syndrome (MPS), which is determined by myofascial trigger points (MTrP). New features have been tested for MTrP diagnosis. The aim of this study was to evaluate two-dimensional ultrasonography (2D US) and ultrasound elastography (UE) images and elastograms of upper trapezius MTrP during electroacupuncture (EA) and acupuncture (AC) treatment. 24 women participated, aged between 20 and 40 years (M ± SD = 27.33 ± 5.05) with a body mass index ranging from 18.03 to 27.59 kg/m2 (22.59 ± 3.11), a regular menstrual cycle, at least one active MTrP at both right (RTPz) and left trapezius (LTPz) and local or referred pain for up to six months. Subjects were randomized into EA and AC treatment groups and the control sham AC (SHAM) group. Intensity of pain was assessed by visual analogue scale; MTrP mean area and strain ratio (SR) by 2D US and UE. A significant decrease of intensity in general, RTPz, and LTPz pain was observed in the EA group (p = 0.027; p < 0.001; p = 0.005, respectively) and in general pain in the AC group (p < 0.001). Decreased MTrP area in RTPz and LTPz were observed in AC (p < 0.001) and EA groups (RTPz, p = 0.003; LTPz, p = 0.005). Post-treatment SR in RTPz and LTPz was lower than pre-treatment in both treatment groups. 2D US and UE effectively characterized MTrP and surrounding tissue, pointing to the possibility of objective confirmation of subjective EA and AC treatment effects.

O efeito da eletroacupuntura no tratamento da dor muscular / The electroacupunture effect for the treatment of muscular pain

A eletroacupuntura é um recurso bastante utilizado na prática clínica para alívio da dor muscular, apesar do restrito número de pesquisas avaliando sua efetividade. Desta forma, este trabalho inclui dois capítulos, sendo o primeiro intitulado Electroacupuncture and the muscle pain threshold: a review, no qual foi realizada a revisão crítica da literatura, com o objetivo de verificar a efetividade da eletroacupuntura no tratamento da dor muscular. As bases de dados pesquisadas foram ISI, Pubmed, Scielo, Scopus, Cochrane, Bireme de 1977 a Janeiro de 2010 para artigos contendo as palavras chave electroacupuncture AND muscle AND pain. Apesar dos estudos avaliados apresentarem diferenças metodológicas, o que dificultou a comparação entre os resultados, todos consideraram que a EA é eficaz no tratamento da dor miofascial. Nenhum dos estudos considerou a influência do ciclo menstrual na avaliação do limiar de dor, nem mesmo o efeito obtido durante o tratamento, apresentando-o apenas antes e após todas as sessões. O segundo capítulo intitula-se Electroacupuncture for myofascial pain in the upper trapezius muscle, que teve como objetivo avaliar longitudinalmente os efeitos da EA no tratamento da dor miofascial da parte superior do músculo trapézio, por meio da Escala Visual Analógica, da algometria digital, da eletromiografia de superfície e do questionário de qualidade de vida SF-36. Os resultados mostraram que a EA foi efetiva no alívio da dor miofascial do músculo trapézio. Foi observado tanto efeito imediato após cada aplicação da EA como também efeito cumulativo especialmente a partir da terceira sessão. A fase pré-menstrual e menstrual parece estar relacionada ao aumento no limiar de dor observado na sexta. Concluiu-se que a EA foi eficaz no alívio da dor miofascial na amostra avaliada.(AU)

The electroacupuncture is a commonly used resource for pain relieving, despite the restrict number of studies evaluating its effectiveness. This work includes two chapters, the first Electroacupuncture and the muscle pain threshold: a review, consisted of a literature critical review regarding the effectiveness of electroacupunture on the muscular pain treatment. The electronic database researched was ISI, Pubmed, Scielo, Scopus, Cochrane, Bireme from 1977 to January 2010, for articles containing the key words electroacupuncture AND muscle AND pain. Although the methodological differences raise difficulties to the analysis of their results, all the evaluated articles considered the method as efficient. Neither regarded the menstrual cycle influence at the pain threshold, nor the effect obtained along the treatment, presenting only the before and after the entire treatment effect. The second chapter, Electroacupuncture for myofascial pain in the upper trapezius muscle, purposed to evaluate the effects of electroacupuncture as a treatment to the upper trapezius myofascial pain on a longitudinal study. The efficacy of the treatment was evaluated in terms of pain intensity using the visual analog scale (VAS), the pressure pain threshold (PPT) by algometry, electromyography (EMG) and the SF-36 questionnaire. The occurrence of influencing factors in the sessions was monitored as was the menstrual cycle of each participant. It was observed both immediate and cumulative effect specially after the third session. The menstrual phase seems to be related to the increase of pain threshold observed on the sixth session. The EA was shown to be a reliable method for pain relief in the trapezius muscle at the evaluated sample.(AU)