Perfil microbiológico da unidade de queimaduras da EPM/UNIFESP, São Paulo, Brasil / Microbiological surveillance of burn unit of EPM/UNIFESP in São Paulo, Brazil

Introdução: Apesar dos grandes avanços em seu tratamento, infecção de pele com queimadura continua a ser um grande desafio. O objetivo deste estudo é avaliar os aspectos microbiológicos do primeiro ano de funcionamento de uma unidade de queimadura em um Hospital Universitário. Métodos: Estudo retrospectivo. Dados microbiológicos foram coletados e analisados a partir de pacientes internados na Unidade de Queimadura (UTQ) do Hospital São Paulo, Hospital Universitário da Escola Paulista de Medicina (EPM) da Universidade Federal de São Paulo (UNIFESP), entre junho de 2009 e julho de 2010. Resultados: O tempo médio de permanência hospitalar foi de 13,8 dias, com uma taxa de mortalidade de 5,9%. A média da superfície corpórea queimada foi de 10,3%. Avaliou-se 159 culturas de 101 pacientes. Culturas de sangue foram as mais solicitadas (41%). Também foram acessadas 245 culturas de vigilância, coletadas de 75 pacientes. A análise microbiológica revelou um índice de positividade total de 34,5%. Os agentes mais prevalentes foram Staphylococcus coagulase-negativo - CoNS - (33%), Pseudomonas aeruginosa (24%), Acinetobacter spp. (22%) e Klebsiella pneumoniae (5%). Conclusão: A avaliação microbiológica do primeiro ano de funcionamento da UTQ da EPM/ UNIFESP revelou que, embora o agente mais prevalente tenha sido a CoNS, bacilos Gram negativos ainda são muito prevalentes, como a Pseudomonas aeruginosa e a Acinetobacter baumannii. Apesar de pouco tempo de operação, observou-se um grande número de microrganismos multirresistentes, que pode ser explicado por longa exposição a agentes antimicrobianos e alta taxa de transferência de outros hospitais.

Introduction: Despite great advances in treatment, burned skin infection remains a major challenge. The aim of this study is to evaluate the microbiological aspects of the first year's operation of a Burn Unit in a University Hospital. Methods: Retrospective study. Microbiological data were collected and analyzed from patients admitted to the Burn Unit of São Paulo Hospital, a University Hospital of the Paulista Medical School (EPM) of the Federal University of São Paulo (UNIFESP) from June 2009 to July 2010. Results: The average length of stay was 13.8 days with a mortality rate of 5.9%, and median of TBSA was 10.3%. Evaluated 159 cultures from 101 patients. Blood cultures were the most requested (41%). It was also accessed 245 surveillance cultures collected from 75 patients. The microbiological analysis revealed a total positivity rate of 34,5%. The most prevalent agents were Coagulase-negative Staphylococcus - CoNS - (33%), Pseudomonas aeruginosa (24%), Acinetobacter spp. (22%) and Klebsiella pneumoniae (5%). Conclusion: The microbiological evaluation of the first year's activity of EPM/UNIFESP Burn Care Unit revealed that, although the most prevalent agent was CoNS, Gram negative bacilli are still very prevalent, such as Pseudomonas aeruginosa and Acinetobacter baumannii. Despite the short time of operation, was observed large number of multiresistant microorganisms which can be explained by long exposure to antimicrobials and high transfer rate from other hospitals.

Keratinocyte growth factor, tumor necrosis factor-alpha and interleukin-1 beta gene expression in cultured fibroblasts and keratinocytes from burned patients

PURPOSE: To evaluate the gene expression of KGF, TNF-alpha and IL-1 beta in skin fibroblasts and keratinocytes cultured from burned patients. METHODS: Three patients with large burns and three patients with small burns, as well as two controls, were included. The cell culture was initiated by the enzymatic method. After extraction and purification of mRNA, qPCR was used to assess the gene expression of KGF, TNF-alpha and IL-1 beta. RESULTS: The expression of KGF was increased on average 220-fold in large burns and 33.33-fold in small burns in fibroblasts, and 11.2-fold in large burns and 3.45-fold in small burns in keratinocytes compared to healthy patients (p<0.05). Expression of TNF-alpha was not observed. IL-1 beta is down-regulated in fibroblasts of burned patients, and much more repressed in small burns (687-fold, p<0.05). In keratinocytes, the repression of IL-1 beta expression occurs in patients with small burns (28-fold), while patients with large burns express this gene intensively (15-fold). CONCLUSIONS: The study showed a quantitative pattern in the expression of KGF gene, which is more expressed according to the size of the burn. TNF-alpha was not expressed. A qualitative pattern in the expression of IL-1 beta gene was demonstrated.