Adipose-derived stromal cells (ASCs) are usually isolated by digestion with collagenase. We have compared alternative methods to isolate ASCs in a more economically viable protocol. Nine protocols using red blood cells lysis buffer solution, trypsin, collagenase and centrifugation were compared; the isolation rate, cell viability, expansion rate, immunophenotype and differentiation in adipogenic and osteogenic lineages were analyzed. ASCs were isolated and successfully maintained by digestion with trypsin. Cells presented similar immunophenotypes, adipogenic differentiation and in vitro proliferation but an osteogenic differentiation capacity up to seven times higher than ASCs isolated by collagenase. This alternative protocol is thus efficient and more cost-effective than the commonly-used methods and may represent a promising protocol for obtaining ASCs for bone tissue engineering.
Purpose: Preoperative imaging evaluation may be useful for determining the position of recti abdominis muscles before their correction. The purpose of this study is to evaluate the accuracy of ultrasonography to measure the width of rectus abdominis muscle diastasis. Methods: Rectus diastasis was measured by ultrasonography preoperatively in 20 females. Rectus diastasis was measured in seven levels along the anterior rectus sheath by ultrasound after sustained deep inspiration and after expiration. Rectus diastasis, at the same levels, was also measured after its exposition during abdominoplasty by two independent observers, using a surgical compass. These values were compared using Wilcoxon's statistical text, for non independent values. Results: There was no significant difference between the values obtained by ultrasound and those measured during surgery in the supra-umbilical levels and at the level of the umbilicus. However, below the umbilicus these values differed significantly, showing smaller values in the imaging evaluation. Conclusion: Ultrasonography is an accurate method to measure rectus diastasis above the umbilicus and at the umbilical level. Key words: Abdominal Wall. Abdominal Muscles. Ultrasonography. Diagnostic Imaging. Surgery, Plastic. Rectus Abdominis. RESUMO Objetivo:Estudos radiológicos pré-operatórios podem ser úteis para determinar a posição dos músculos retos do abdome antes de sua correção. O objetivo deste estudo é avaliar a acurácia da ultra-sonografia para medir a largura da diástase dos músculos retos do abdome. Métodos: A diástase dos músculos retos foi medida pela ultra-sonografia, no pré-operatório em 20 mulheres. A diástase dos retos foi medida em sete níveis da bainha anterior dos retos foram examinados com ultrasom após inspiração profunda sustentada e após expiração. A diástase dos retos, nos mesmos níveis, foi também medida após sua exposição durante a abdominoplastia, por dois observadores independentes, usando compasso cirúrgico. As medidas foram comparadas usando o teste estatístico de Wilcoxon para dados não independentes. Resultados: Não houve diferença significante entre as medidas ultra-sonográficas e intra-operatórias nos níveis supra-umbilicais e na cicatriz umbilical. Todavia, inferiormente à cicatriz umbilical, essas medidas diferiram significantemente sendo as ultrasonográficas menores nestes pontos. Conclusão: A ultra-sonografia é um método acurado para medir a diástase de retos na região supra-umbilical e no nível do umbigo.
Purpose:The aim of the present study was to assess, in cadavers, the resistance to medial traction of the posterior and anterior layer of the rectus abdominis muscle sheath. Methods: An anatomical, prospective, self-controlled study was carried out in 20 male cadavers. An evaluation of the tension of the posterior and anterior layers of the rectus abdominis muscle sheath was performed following anatomical dissection of these structures. The traction necessary to advance the tissue ten millimeters was assessed using an analogic dynamometer. Results There was no significant statistical difference between the necessary traction at various levels of the anterior and posterior layers of the rectus sheath. However, medial advancement of the anterior layer of the rectus sheath required more traction strength than did advancement of the posterior layer to the midline. Conclusion: There is no difference in the tensile strength in the various levels of the anterior and posterior layers of the rectus sheath; however, medial advancement of the the anterior layer required more traction strength. Key words: Abdominal muscles. Tensile strength. Rectus abdominis. Cadáver. RESUMO Objetivo:Comparar a resistência à tração medial das lâminas posterior e anterior da bainha do músculo reto do abdome em diferentes níveis supra e infra-umbilicais em cadáveres. Métodos: Vinte cadáveres adultos foram submetidos à dissecção da parede abdominal anterior. Foram feitas alças com fio de náilon no plano aponeurótico em oito pontos diferentes na lâmina anterior e na lâmina posterior da bainha do músculo reto do abdome, sendo quatro destes pontos supra-umbilicais e quatro infra-umbilicais. Com o uso de um dinamômetro analógico, foi verificada a força necessária para o avanço medial de dez milímetros destes dezesseis pontos. Resultados: Não foram encontradas diferenças significantes de medidas da resistência à tração entre os diferentes níveis da aponeurose anterior e posterior, mas quando se comparou as medidas obtidas na aponeurose anterior às obtidas na posterior verificou-se que a aponeurose anterior necessitou de maior força de tração para o avanço medial. Conclusão: Não há diferença de tensão ao longo da aponeurose anterior e posterior. A aponeurose anterior é mais resistente à tração medial quando comparada à posterior. Descritores: Músculos Abdominais. Resistência à Tração. Reto do Abdome. Cadáver. -ORIGINAL ARTICLE Amorim CR et al 256
Os autores descrevem o trabalho realizado no laboratório de Microcirurgia Experimental do Serviço de Cirurgia Plástica ISCMPA-FFFCMPA, enfatizando alternativas no treinamento inicial de microcirurgia com investimento reduzido, mostrando o resultado experimental obtido
The authors describe their experience at the Experimental Microsurgery Lab of the Plastic Surgery Service of Irmandade Santa Casa de Misericórdia de Porto Alegre Hospital -- Fundação Faculdade Federal de Ciências Médicas de Porto Alegre Medical School, highlighting initial low cost microsurgery training alternatives. They present the experimental results obtained
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