Histological evaluation of capsules formed by silicon implants coated with polyurethane foam and with a textured surface in rats

ABSTRACT PURPOSE: To assess the capsules formed by silicone implants coated with polyurethane foam and with a textured surface. METHODS: Sixty-four Wistar albinus rats were divided into two groups of 32 each using polyurethane foam and textured surface. The capsules around the implants were analyzed for 30, 50, 70 and 90 days. Were analyzed the following parameters: foreign body reaction, granulation tissue, presence of myofibroblasts, neoangiogenesis, presence of synovial metaplasia, capsular thickness, total area and collagen percentage of type I and III, in capsules formed around silicone implants in both groups. RESULTS: The foreign body reaction was only present in the four polyurethane subgroups. The formation of granulation tissue and the presence of myofibroblasts were higher in the four polyurethane subgroups. Regarding to neoangiogenesis and synovial metaplasia, there was no statistical difference between the groups. Polyurethane group presented (all subgroups) a greater capsule thickness, a smaller total area and collagen percentage of type I and a higher percentage area of type III, with statistical difference. CONCLUSION: The use of polyurethane-coated implants should be stimulated by the long-term results in a more stable capsule and a lower incidence of capsular contracture, despite developing a more intense and delayed inflammatory reaction in relation to implants with textured surface.

Effect of propranolol on capsular reaction around silicone implants in guinea pigs

PURPOSE: To evaluate the effect of propranolol on capsular architecture around silicone implants by measuring the inflammation, capsular thickness, and collagen fiber density, using a guinea pig experimental model. METHODS: Thirty six adult male guinea pigs randomly divided into two groups (n=18) were used. Each one received a silicone implant with textured-surface. The capsular tissue around implants from untreated or treated animals with the beta-adrenoceptor antagonist propranolol (10 mg/kg, dissolved in daily water) were analyzed for inflammation by histological scoring, capsular thickness by computerized histometry, and collagen fibers type I and Type III density by picrosirius polarization at different time points (7, 14 or 21 days after silicone implantation). RESULTS: Propranolol treatment reduced inflammation and impaired capsular thickness and delayed collagen maturation around the textured implant. CONCLUSION: Propranolol reduces the risk of developing capsular contracture around silicone implants with textured surface. .

Opções a capsulotomia e capsulectomia no tratamento da contratura capsular: existem alternativas medicamentosas ao tratamento cirúrgico? Revisão de literatura / Options for capsulotomy and capsulectomy in the treatment of capsular contracture: are there clinical treatment alternatives to surgery? A literature review

INTRODUÇÃO: A contratura capsular é uma das principais complicações em cirurgias envolvendo implantes mamários. A classificação mais usada para avaliar o grau de contratura é a de Baker, que a divide em graus I, II, III e IV, sendo as de grau III e IV consideradas significativas. Apesar de existirem diversas teorias, a etiologia da contratura capsular permanece incerta. O tratamento convencional para os casos de contratura é a abordagem cirúrgica com realização de capsulotomia ou capsulectomia. Estes procedimentos, no entanto, não estão isentos de morbidades, com complicações como deiscências, hematomas, seromas, pneumotórax, assimetrias e recidiva da contratura. Este estudo faz uma revisão sobre as alternativas ao tratamento cirúrgico convencional, descritas na literatura. MÉTODOS: Foi realizada pesquisa nas bibliotecas da Pubmed e da Cochrane, utilizando-se os termos: 'capsular contracture', 'capsular contracture treatment' e 'capsular contracture breast treatment'. Foram identificados 991 artigos e selecionados os que discutiam opções medicamentosas para o tratamento de contratura, diferentes de capsulectomia e capsulotomia. RESULTADOS: Foram encontrados vårios estudos utilizando drogas com o fim de reduzir a contratura capsular, das quais o Zafirlucaste é apresentado em maior número de trabalhos. CONCLUSÃO: Dentre as várias drogas utilizadas, o Zafirlucaste apresentou boa eficácia, com baixos índices de complicação; a Triancinolona parece ser também uma boa opção, no entanto precisa de profissional habilitado para realizar as infiltrações. As demais drogas necessitam de maiores estudos.

INTRODUCTION: Capsular contracture is among the main complications of surgeries involving breast implants. The most commonly used classification to assess the degree of contracture is the Baker grading system, which divides contractures into grades I, II, III, and IV. Of these, grade III and IV contractures are considered significant. Although several causes have been postulated, the etiology of capsular contracture remains uncertain. Conventional treatment for contracture is based on a surgical approach, specifically capsulotomy or capsulectomy. These procedures, however, are not exempt from morbidity, and patients may develop complications such as dehiscence, hematoma, seroma, pneumothorax, asymmetry, and contracture recurrence. This study provides a review of alternatives to conventional surgery described in the literature. METHODS: We researched the PubMed and Cochrane Library databases using the following keywords: "capsular contracture", "capsular contracture treatment", and "capsular contracture breast treatment". We identified 991 articles from which we selected those discussing medication options for contracture treatment other than capsulectomy and capsulotomy. RESULTS: We identified several studies in which drugs, most commonly zafirlukast, were used to reduce capsular contracture. CONCLUSION: Among the various reported drugs, zafirlukast exhibited good efficacy and a low rate of complication. Triamcinolone also appears to be a good option, although professional assistance would be needed for drug administration via infiltration. The other drugs described would require further investigation.