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      Toxina botulínica en el tratamiento del síndrome de dolor miofascial Translated title: Botulinum toxin in the treatment of myofascial pain syndrome

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          Abstract

          RESUMEN Las infiltraciones con toxina botulínica han sido utilizadas en el tratamiento del dolor asociado a múltiples patologías, como distonías focales, espasticidad, cefaleas y dolor miofascial. Sin embargo, los resultados de los diferentes estudios realizados con toxina botulínica en el síndrome de dolor miofascial (SDM) son contradictorios. El objetivo de la presente revisión es analizar la evidencia de la eficacia de la toxina botulínica tipo A (TBA) frente a placebo en la disminución del dolor crónico de origen miofascial. Se realizó una búsqueda bibliográfica en PubMed, Web of Science (WoS), Scielo y Scopus, utilizando las siguientes palabras clave: dolor miofascial, punto gatillo, toxina botulínica y bótox. Los estudios que cumplieron los criterios inclusión fueron once ensayos clínicos que comparaban la TBA frente a solución salina normal (SSN). Aunque en la mayoría de los ensayos clínicos analizados no podemos evidenciar un beneficio de la TBA frente a SSN, no sería acertado concluir que la toxina botulínica no está indicada en el tratamiento de dolor asociado al SDM, dado que existe una selección de pacientes muy heterogénea, hay una gran variabilidad en la dosis de toxina botulínica, se usan diferentes técnicas de infiltración de los puntos gatillo (PG), la duración de los estudios es variable y no hay estudios que realicen un análisis costo-efectivo. Se necesitan ensayos clínicos más específicos, con muestras más homogéneas, que nos permitan sacar conclusiones acerca del papel de la TBA en el tratamiento del SDM.

          Translated abstract

          ABSTRACT Botulinum toxin injections have been used in pain treatment associated with pathologies such as focal dystonia, spasticity, headaches and myofascial pain. However, results from botulinum toxin trials in myofascial pain syndrome (MPS) are contradictory. The objective of this paper is to analyze the evidence of botulinum toxin type A (BTA) efficacy compared to placebo in myofascial pain management. Literature search was performed in PubMed, Web of Science (WoS), Scielo and Scopus, using the following key words: myofascial pain, trigger point, botulinum toxin and botox. Eleven clinical trials comparing BTA versus normal saline solution (NSS) met the inclusion criteria. Although most of the clinical trials analyzed cannot demonstrate a BTA superiority, it would not be correct to conclude that botulinum toxin is not indicated in miofascial pain treatment due to the great heterogeneous patient selection, variability in BTA doses, different trigger points (TP) injections techniques, variability in trials duration, and absence of cost-effective analysis. More specific clinical trials are required using homogeneous samples to provide conclusive evidence for BTA in the MPS treatment.

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          Most cited references35

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          Comparison of lidocaine injection, botulinum toxin injection, and dry needling to trigger points in myofascial pain syndrome.

          Myofascial pain syndrome (MPS) is one of the most common causes of chronic musculoskeletal pain. Several methods have been recommended for the inactivation of trigger points (TrP). This prospective, single-blind study was proposed to compare TrP injection with botulinum toxin type A (BTX-A) to dry needling and lidocaine injection in MPS. Eighty-seven trigger points (cervical and/or periscapular regions) in 23 female and six male patients with MPS were treated and randomly assigned to three groups: lidocaine injection (n=10, 32 TrP), dry needling (n=10, 33 TrP), and BTX-A injection (n=9, 22 TrP). Clinical assessment including cervical range of motion, TrP pain pressure threshold (PPT), pain scores (PS), and visual analog scales for pain, fatigue, and work disability were evaluated at entry and the end of the 4th week. Additionally, depression and anxiety were evaluated with the Hamilton depression and anxiety rating scales, and quality of life was assessed using the Nottingham health profile (NHP). The subjects were also asked to describe side effects. INJECTION PROCEDURE: One milliliter of 0.5% lidocaine was administered to each TrP in the lidocaine injection group, 10-20 IU of BTX-A to each TrP in the BTX-A group, and dry needling to each TrP in the last group, followed by stretching of the muscle groups involved. The patients were instructed to continue their home exercise programs. Pain pressure thresholds and PS significantly improved in all three groups. In the lidocaine group, PPT values were significantly higher than in the dry needle group, and PS were significantly lower than in both the BTX-A and dry needle groups. In all, visual analog scores significantly decreased in the lidocaine injection and BTX-A groups and did not significantly change in the dry needle group. Disturbance during the injection procedure was lowest in the lidocaine injection group. Quality of life scores assessed by NHP significantly improved in the lidocaine and BTX-A groups but not in the dry needle group. Depression and anxiety scores significantly improved only in the BTX-A-injected group. Injection is more practical and rapid, since it causes less disturbance than dry needling and is more cost effective than BTX-A injection, and seems the treatment of choice in MPS. On the other hand, BTX-A could be selectively used in MPS patients resistant to conventional treatments.
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            A comparative trial of botulinum toxin type A and methylprednisolone for the treatment of myofascial pain syndrome and pain from chronic muscle spasm.

            M Porta (2000)
            Myofascial pain syndrome (MPS) is a common illness, characterised by acute or chronic focal pain, muscle stiffness and fatigue. The pathophysiology of MPS remains unclear. Previous preliminary studies have demonstrated therapeutic efficacy of the muscle relaxant botulinum toxin type A (BTX-A) in the treatment of MPS. A single-centre, randomised trial compared the effects of BTX-A with the steroid methylprednisolone (both administered intramuscularly with 0.5% bupivacaine), in 40 patients suffering from chronic myofascial pain in the piriformis, iliopsoas or scalenus anterior muscles. Thirty days after receiving an injection of either BTX-A or steroid followed by post-injection physiotherapy, pain severity had decreased significantly from baseline in both treatment groups, with no significant difference between the two treatment groups. However, the baseline pain score was significantly higher in the BTX-A treatment group compared with the steroid group (7.9 vs. 7.3), and the reduction in pain score between baseline and 30 days post-injection was greater in the BTX-A group compared with the steroid group (-3.9 vs. -3.5; P=0.06). At 60 days post-injection, the pain severity score for the BTX-A-treated patients was statistically significantly lower than the pain score for the steroid-treated population (2.3 vs. 4.9). Furthermore, the reduction in pain score in the BTX-A group at 60 days post-injection was greater than at 30 days (-5.5 vs. -3.9), whereas the effect of the steroid had begun to wane. These results indicate the superior efficacy of BTX-A over conventional steroid treatment in patients suffering from MPS, when combined with appropriate physiotherapy.
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              Botulinum toxin treatment of pain syndromes –an evidence based review

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                Author and article information

                Journal
                dolor
                Revista de la Sociedad Española del Dolor
                Rev. Soc. Esp. Dolor
                Inspira Network Group, S.L (Madrid, Madrid, Spain )
                1134-8046
                April 2021
                : 28
                : 2
                : 100-110
                Affiliations
                [1] Granada orgnameHospital Universitario Virgen de las Nieves orgdiv1Unidad del Dolor España
                [2] Majadahonda Madrid orgnameHospital Universitario Puerta de Hierro orgdiv1Unidad del Dolor España
                Article
                S1134-80462021000300008 S1134-8046(21)02800200008
                10.20986/resed.2021.3902/2021
                5ac9ba65-9734-4f01-b706-c223c773c607

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 15 February 2021
                : 17 April 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 11
                Product

                SciELO Spain

                Categories
                Revisión

                bótox,Myofascial pain,trigger point,botulinum toxin,toxina botulínica,punto gatillo,botox,Dolor miofascial

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