Análise clínica e microbiológica de úlceras venosas de pacientes atendidos em Unidades Básicas de Saúde de Goiânia
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2012-03-30
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Universidade Federal de Goiás
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This cross-sectional study was performed in the dressing rooms of the primary healthcare network of Goiânia, Goiás, Brasil, with the following objectives: to identify the prevalence of Gram-negative bacteria (GNB) in venous ulcers (VU) with clinical signs of infection; analyze the susceptibility profile of the isolates; detect the production of AmpC β-lactamases and metallo-beta-lactamases, and extended spectrum beta-lactamase (ESBL); describe the clinical signs and symptoms of infection in VU; evaluate the wounds clinical stage of infection and its relationship with the presence of GNB. The data were analyzed by means of descriptive statistics procedures, proportion and Chi-square tests (p<0.05). All ethical aspects were followed. The participants were 69 patients with venous ulcers, with or without arterial complication, totaling 98 wounds. It was verified that 74.5% of the wounds showed GNB growth, particularly enterobacteria (53.8%) and non-fermenting gram-negative bacteria (46.2%). The prevalent species among the enterobacteria was Escherichia coli (24.5%), followed by Enterobacter aerogenes, Pantoea agglomerans and Proteus mirabilis (12.2% each). Regarding the non-fermenting gram-negative bacteria, the prevalent genre was Pseudomonas (66.6%), particularly the species P. aeruginosa (59.5%), present in 25.5% of the analyzed wounds. Regarding the susceptibility profile of the enterobacteria, the highest resistance rates were to tetracycline (38.8%) and amoxicillin-clavulanic acid (26.5%). Among P. aeruginosa, the highest resistance was observed for cefoxitin (100%). Regarding the production of the AmpC enzyme, 30% of the microorganisms in the CESP (Citrobacter spp., Enterobacter spp., Serratia spp. and Providencia spp.) group, and 100% of the P. aeruginosa were resistant to cefoxitin. The remaining microorganisms of the CESP group (70%) that were sensitive to cefoxitin were subjected to a confirmatory test, and 37.5% were found to be positive for the production of the AmpC enzyme. Regarding metallo-beta-lactamase, 23.8% of the non-fermenting gram-negative bacteria showed reduced sensitivity to imipenem, meropenem or ceftazidime. When subjected to the confirmatory test, 8% of the P. aeruginosa were positive for the MBL enzyme. Regarding the clinical signs and symptoms of infection, the highlighted results with >70% frequency are: opaque and/or reddish brown discoloration; increase in exudate volume and pain. Stage-three infection was the most prevalent (71.4%). An association was found between cellulitis and friable granulation tissue that bleeds easily and the culture for GNB. In conclusion, the presence of gram-negative pathogens with resistance profiles in primary healthcare patients suggests the need to implement microbiological surveillance for patients with VU experiencing a prolonged or difficult healing process, and that the identification VU infection should be guided by knowledge regarding the etiology, classic characteristic and clinical stages of infection.
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SANTOS, Silvana de Lima Vieira dos. Clinical and microbiological analysis of the venous ulcers of patients treated at Basic Health Centers of Goiânia. 2012. 193 f. Tese (Doutorado em Ciencias da Saude) - Universidade Federal de Goiás, Goiânia, 2012.