RESUMO
BACKGROUND: Sternal wound infection (SWI) after coronary artery bypass graft (CABG) surgery is a major complication. Identifying patients at risk of SWI is essential for the application of preventive measures. OBJECTIVE: To identify the pre- and intra-operative risk factors, apply the STS risk score and determine the correlation between the risk score and microorganisms isolated from surgical wounds in a Brazilian hospital. METHODS: This is a retrospective analysis of a database of all CABG surgeries performed in a single institution from 2006 to 2008. Chi-square analysis was used for categorical variables and Student's t-test was used for quantitative variables. Multivariate logistic regression model was used to identify independent risk factors for SWI. P <0.05 was considered significant. RESULTS: The infection rate was 7.2 percent (143/1975). The multiple regression analysis found the following risk factors: female gender (OR 2.06; 95 percentCI 1.40-3.03; P<0.001), BMI>40 kg/m² (OR 6.27, 95 percentCI 2.53-15.48; P<0.001), diabetes (OR 2.33; 95 percentCI 1.56-3.49; P<0.001), number of affected coronary arteries (OR 7.78; 95 percentCI 1.04-57.79; P<0.001) and use of bilateral internal thoracic artery (OR 3.85; 95 percentCI 2.10-7.07; P<0.001). Infected patients had a mean score of 9, whereas non-infected patients had a mean score of 7 (P<0.001). There was no correlation between microorganisms, scores and risk factors. CONCLUSION: Female gender, diabetes, BMI>40 kg/m², number of affected coronary arteries and use of bilateral internal thoracic artery were associated with a higher risk of infection. The STS risk score can be successfully used and there was no correlation between microorganisms, the score and risk factors at our institution.
FUNDAMENTO: A infecção de ferida operatória esternal após cirurgia de revascularização miocárdica (CRM) é uma grave complicação. Identificar pacientes com risco elevado é fundamental para introdução de medidas de preventivas. OBJETIVO: Identificar os fatores de risco pré e intra-operatórios, avaliar o escore de risco da STS e correlação entre o escore e os microorganismos isolados em ferida operatória em hospital brasileiro. MÉTODOS: Análise retrospectiva de um banco de dados prospectivamente coletado de todas as CRM realizadas em centro único, no período de 2006 a 2008. Teste do qui-quadrado foi utilizado para variáveis categóricas e teste t-Student, para variáveis quantitativas. Modelo multivariado por regressão logística foi utilizado para identificação de fatores de risco independente para infecção de ferida esternal. P<0,05 foi considerado significativo. RESULTADOS: A incidência de infecção foi de 7,2 por cento (143/1975). Na regressão múltipla, identificamos os seguintes fatores de risco: sexo feminino (OR 2,06; IC95 por cento; 1,40-3,03; P<0,001), IMC>40 kg/m² (OR 5,38; IC95 por cento; 2,24-12,90; P<0,001), diabetes (OR 2,33; IC95 por cento 1,56-3,49; P<0,001), número de artérias coronárias acometidas (OR 2,06; IC95 por cento; 1,40-3,03; P<0,001) e uso bilateral de artéria torácica interna (OR 3,44; IC95 por cento 1,89-6,26; P<0,001). Os pacientes infectados apresentaram média de escore da STS de 9 versus 7 nos não infectados (P<0,001). Não houve correlação entre microorganismos, escore e fatores de risco. CONCLUSÃO: Sexo feminino, diabetes, IMC>40 kg/m², número de artérias coronárias acometidas, uso bilateral da artéria torácica interna foram associados a maior risco de infecção. O escore de risco da STS pode ser aplicado com sucesso, não havendo correlação entre microrganismos, escore e fatores de risco em nossa instituição.
Assuntos
Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Índice de Massa Corporal , Ponte de Artéria Coronária/efeitos adversos , Complicações do Diabetes , Esterno/cirurgia , Infecção da Ferida Cirúrgica/microbiologia , Métodos Epidemiológicos , Medição de Risco/métodos , Medição de Risco/normas , Infecção da Ferida Cirúrgica/epidemiologiaRESUMO
BACKGROUND: Sternal wound infection (SWI) after coronary artery bypass graft (CABG) surgery is a major complication. Identifying patients at risk of SWI is essential for the application of preventive measures. OBJECTIVE: To identify the pre- and intra-operative risk factors, apply the STS risk score and determine the correlation between the risk score and microorganisms isolated from surgical wounds in a Brazilian hospital. METHODS: This is a retrospective analysis of a database of all CABG surgeries performed in a single institution from 2006 to 2008. Chi-square analysis was used for categorical variables and Student's t-test was used for quantitative variables. Multivariate logistic regression model was used to identify independent risk factors for SWI. P <0.05 was considered significant. RESULTS: The infection rate was 7.2% (143/1975). The multiple regression analysis found the following risk factors: female gender (OR 2.06; 95%CI 1.40-3.03; P<0.001), BMI>40 kg/m² (OR 6.27, 95%CI 2.53-15.48; P<0.001), diabetes (OR 2.33; 95%CI 1.56-3.49; P<0.001), number of affected coronary arteries (OR 7.78; 95%CI 1.04-57.79; P<0.001) and use of bilateral internal thoracic artery (OR 3.85; 95%CI 2.10-7.07; P<0.001). Infected patients had a mean score of 9, whereas non-infected patients had a mean score of 7 (P<0.001). There was no correlation between microorganisms, scores and risk factors. CONCLUSION: Female gender, diabetes, BMI>40 kg/m², number of affected coronary arteries and use of bilateral internal thoracic artery were associated with a higher risk of infection. The STS risk score can be successfully used and there was no correlation between microorganisms, the score and risk factors at our institution.
