Brazilian Journal of Anesthesiology
https://app.periodikos.com.br/journal/rba/article/doi/10.1016/j.bjane.2015.04.007
Brazilian Journal of Anesthesiology
Scientific Article

Axillary local anesthetic spread after the thoracic interfacial ultrasound block - a cadaveric and radiological evaluation

Dispersão axilar de anestésico local após bloqueio interfascial torácico guiado por ultrassom - estudo radiológico e em cadáver

Patricia Alfaro de la Torre; Jerry Wayne Jones Jr.; Servando López Álvarez; Paula Diéguez Garcia; Francisco Javier Garcia de Miguel; Eva Maria Monzon Rubio; Federico Carol Boeris; Monir Kabiri Sacramento; Osmany Duany; Mario Fajardo Pérez; Borja de la Quintana Gordon

http://dx.doi.org/10.1016/j.bjane.2015.04.007 Braz J Anesthesiol, vol.67, n6, p.555-564, 2017
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Abstract

Abstract Background Oral opioid analgesics have been used for management of peri- and postoperative analgesia in patients undergoing axillary dissection. The axillary region is a difficult zone to block and does not have a specific regional anesthesia technique published that offers its adequate blockade. Methods After institutional review board approval, anatomic and radiological studies were conducted to determine the deposition and spread of methylene blue and local anesthetic injected respectively into the axilla via the thoracic inter-fascial plane. Magnetic Resonance Imaging studies were then conducted in 15 of 34 patients scheduled for unilateral breast surgery that entailed any of the following: axillary clearance, sentinel node biopsy, axillary node biopsy, or supernumerary breasts, to ascertain the deposition and time course of spread of solution within the thoracic interfascial plane in vivo. Results Radiological and cadaveric studies showed that the injection of local anesthetic and methylene blue via the thoracic inter-fascial plane, using ultrasound guide technique, results in reliable deposition into the axilla. In patients, the injection of the local anesthetic produced a reliable axillary sensory block. This finding was supported by Magnetic Resonance Imaging studies that showed hyper-intense signals in the axillary region. Conclusions These findings define the anatomic characteristics of the thoracic interfascial plane nerve block in the axillary region, and underline the clinical potential of this novel nerve block.

Keywords

Anesthesia, conduction, Axilla, Intercostal muscles, Brachial plexus block, Intercostal nerves, Lymph node excision, Ultrasonography

Resumo

Resumo Justificativa Os analgésicos orais à base de opioides têm sido usados para o manejo da analgesia nos períodos peri e pós-operatório de pacientes submetidos à linfadenectomia axilar. A região axilar é uma zona difícil de bloquear e não há registro de uma técnica de anestesia regional específica que ofereça o seu bloqueio adequado. Métodos Após a aprovação do Conselho de Ética institucional, estudos anatômicos e radiológicos foram feitos para determinar a deposição e disseminação de azul de metileno e anestésico local, respectivamente injetados na axila via plano interfascial torácico. Exames de ressonância magnética foram então feitos em 15 de 34 pacientes programados para cirurgia de mama unilateral que envolveria qualquer um dos seguintes procedimentos: esvaziamento axilar, biópsia de linfonodo sentinela, biópsia de linfonodo axilar ou mamas supranumerárias, para verificar a deposição e o tempo de propagação da solução dentro do plano interfascial torácico in vivo. Resultados Estudos radiológicos e em cadáveres mostraram que a injeção de anestésico local e azul de metileno via plano interfascial torácico com a técnica guiada por ultrassom resulta em deposição confiável na axila. Nos pacientes, a injeção de anestésico local produziu um bloqueio sensitivo axilar confiável. Esse achado foi corroborado por estudos de ressonância magnética que mostraram sinais hiperintensos na região axilar. Conclusões Esses achados definem as características anatômicas do bloqueio da região axilar e destacam o potencial clínico desses novos bloqueios.

Palavras-chave

Anestesia por condução, Axila, Músculos intercostais, Bloqueio do plexo braquial, Nervos intercostais, Excisão de linfonodo, Ultrassonografia

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