Objective:The aim of the present study was to define normative data of phrenic nerve conduction parameters of a healthy population. Methods: Phrenic nerve conduction studies were performed in 27 healthy volunteers. Results: The normative limits for expiratory phrenic nerve compound muscle action potential were: amplitude (0.47 mv -0.83 mv), latency (5.74 ms -7.10 ms), area (6.20 ms/mv -7.20 ms/mv) and duration (18.30 ms -20.96 ms). Inspiratory normative limits were: amplitude (0.67 mv -1.11 mv), latency (5.90 ms -6.34 ms), area (5.62 ms/mv -6.72 ms/mv) and duration (13.77 ms -15.37 ms). Conclusion: The best point of phrenic nerve stimulus in the neck varies among individuals between the medial and lateral border of the clavicular head of the sternocleidomastoid muscle and stimulation of both sites, then choosing the best phrenic nerve response, seems to be the appropriate procedure.Keywords: electrodiagnosis; reference values; phrenic nerve; spirometry; neural conduction. RESUMOObjetivo: O objetivo do presente estudo foi definir os dados normativos de condução do nervo frênico de uma população saudável. Métodos: Foram realizados estudos de condução do nervo frênico em 27 voluntários saudáveis. Resultados: Os limites normais do potencial de ação muscular composto do nervo frênico durante a expiração foram: amplitude (0.47 mv -0.83 mv), latência (5.74 ms -7.10 ms), área (6.20 ms/mv -7.20 ms/mv) e duração (18.30 ms -20.96 ms). E durante a inspiração os limites normais foram: amplitude (0.67 mv -1.11 mv), latência (5.90 ms -6.34 ms), área (5.62 ms/mv -6.72 ms/mv) e duração (13.77 ms -15.37 ms). Conclusão: O melhor ponto de estímulo do nervo frênico no pescoço varia entre a borda medial e lateral da cabeça clavicular do músculo esternocleidomastóideo. Estimular ambos os locais e escolher a melhor resposta do nervo frênico parece ser o procedimento mais adequado.Palavras-chave: eletrodiagnóstico; valores de referência; nervo frênico; espirometria; condução nervosa.Phrenic nerve conduction has found increasing application in the diagnosis of respiratory dysfunction associated with surgical, neuromuscular, and pulmonary disorders 1,2,3,4,5,6 , which are important causes of respiratory failure and frequently contribute to difficulties in weaning patients off the ventilator in the critical care unit 7 . To determine a neuromuscular cause of hypercapnic respiratory failure, respiratory electrodiagnostic studies are often used 8 . Recently, many authors have correlated phrenic nerve conduction abnormalities with chronic obstructive pulmonary disease. These studies demonstrated abnormal phrenic compound motor action potential (CMAP) amplitudes and latencies in chronic obstructive pulmonary disease patients 9,10,11,12 .Innervated by the phrenic nerve, the diaphragm is the principal respiratory muscle in humans. The diaphragmatic CMAPs are recorded with chest surface electrodes following phrenic nerve stimulation in the neck. Amplitude, latency, and area are measures used to evaluate phrenic nerve integrity 1,2,3,4,5,...

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Quantitative electromyography is an important tool to evaluate myopathies, and some difficult-to-treat asthmatic patients may have a subclinical corticosteroid myopathic process, using only inhaled corticosteroid, according to some studies. In this report, diaphragm quantitative electromyography was used to evaluate asthmatic difficult-to-treat patients, comparing them with a control group. Significant differences were obtained in amplitude, duration and size index of motor unit action potentials, with lower parameters in the asthmatic patients, which may indicate a myopathic process.

Trans women are specifically vulnerable to interpersonal violence. Being perceived as the gender that a transgender person identifies with, defined in some contexts as passing, may influence violence ratings. The EVAS (Violence and Health Self-Evaluation) study was a cross-sectional study that enrolled 121 trans women between 2019 and 2020 in Rio de Janeiro, Brazil, aiming to investigate the association between self-reported passing and different types of interpersonal violence. We enrolled 121 participants who had a median age of 36.3 (interquartile range [IQR] 13.7). Most of them were Black/mixed (78.5%) and had at least a high school education (63%). Most participants considered themselves as trans women (71.9%). Their median monthly income was $252.50 (IQR $302.50). Only 40 (33.1%) trans women had a main partner. Trans women with high passing had a higher prevalence of family violence and lower prevalence of observed police violence, violence in open and closed public spaces. Participants that reported a high passing had higher prevalence of family violence (p = .016); moreover, they reported observing less frequently police violence in the neighborhood they lived in for the last 12 months (p = .012) as well as having lower rates of suffering violence. Trans women who reported high passing had 81% (56%-92%) lower chance of suffering violence in open public places more than once, while prior racism experience had a positive association with violence in an open public place (aOR = 3.93, 95% CI [.48, 15.40]). Passing seems to protect from violence in public spaces, whilst it increases family violence. Data also suggest that observing police violence and violence in close public spaces. There is an urgent need to better understand the complex relationships around violence and foster its prevention.

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Objetivo: identificar na literatura acadêmica as principais discriminações interseccionais vividas por mulheres trans e discutir o seu processo de estabelecimento nesse grupo populacional. Método: estudo de revisão integrativa de literatura conduzida em duas bases e três bibliotecas virtuais durante o ano de 2021 e revisada em 2022. Foi realizada análise lexicográfica por meio do software IRAMUTEC. Resultados: foram identificados 486 manuscritos, selecionando-se 15 para análise. Emergiram três categorias analíticas: (1) Interseccionalidade como multiplicador de opressões, (2) Dificuldade de acesso ao cuidado e a precarização da saúde e (3) Necessidade de Políticas Públicas Específicas e o enfrentamento da InJustiça. Conclusão: as condições estruturais do racismo, sexismo, etnofobia e violências correlatas se sobrepõem, e na base da pirâmide discriminatória se encontram as mulheres transexuais negras. Pesquisas adicionais são necessárias para levar a melhores intervenções a esta população em risco de violência.ABSTRACTObjective: to identify, in the academic literature, the main intersecting discriminations experienced by trans women and to discuss process by which it is established related to this population group. Method: this integrative literature review study was conducted in two databases and three virtual libraries during 2021 and then revised in 2022. Lexicographic analysis was performed using the IRAMUTEC software. Results: 486 manuscripts were identified and 15 were selected for analysis. Three analytical categories emerged: (1) Intersectionality as a multiplier of oppression; (2) Difficulty in accessing care and increasingly precarious health; and (3) Need for specific public policies and addressing injustice. Conclusion: the structural conditions of racism, sexism, ethnophobia, and related violence overlap, and black transsexual women are at the base of the pyramid of discrimination. Additional research is needed to lead to better interventions for this population at risk of violence.RESUMENObjetivo: identificar en la literatura académica las principales discriminaciones interseccionales experimentadas por mujeres trans, así como discutir su proceso de implantación en este grupo poblacional. Método: estudio de revisión integradora de literatura realizado en dos bases de datos y tres bibliotecas virtuales durante el año 2021 y revisado en 2022. El análisis lexicográfico se realizó mediante el software IRAMUTEC. Resultados: se identificaron 486 manuscritos y se seleccionaron 15 para su análisis. Surgieron tres categorías de análisis: (1) Interseccionalidad como multiplicador de la opresión, (2) Dificultad de acceso a la atención y precarización de la salud, y (3) Necesidad de Políticas Públicas Específicas y el enfrentamiento a la InJusticia. Conclusión: las condiciones estructurales del racismo, el sexismo, la etnofobia y las violencias relacionadas se superponen, y en la base de la pirámide de discriminación se encuentran las mujeres negras transgénero. Se necesita investigaciones adicionales para conducir a mejores intervenciones para esta población en riesgo de violencia.

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