Clinical Outcomes and Bacterial Characteristics of Carbapenem-resistant Acinetobacter baumannii Among Patients From Different Global Regions.

BACKGROUND: Carbapenem-resistant Acinetobacter baumannii (CRAb) is 1 of the most problematic antimicrobial-resistant bacteria. We sought to elucidate the international epidemiology and clinical impact of CRAb. METHODS: In a prospective observational cohort study, 842 hospitalized patients with a clinical CRAb culture were enrolled at 46 hospitals in five global regions between 2017 and 2019. The primary outcome was all-cause mortality at 30 days from the index culture. The strains underwent whole-genome analysis. RESULTS: Of 842 cases, 536 (64%) represented infection. By 30 days, 128 (24%) of the infected patients died, ranging from 1 (6%) of 18 in Australia-Singapore to 54 (25%) of 216 in the United States and 24 (49%) of 49 in South-Central America, whereas 42 (14%) of non-infected patients died. Bacteremia was associated with a higher risk of death compared with other types of infection (40 [42%] of 96 vs 88 [20%] of 440). In a multivariable logistic regression analysis, bloodstream infection and higher age-adjusted Charlson comorbidity index were independently associated with 30-day mortality. Clonal group 2 (CG2) strains predominated except in South-Central America, ranging from 216 (59%) of 369 in the United States to 282 (97%) of 291 in China. Acquired carbapenemase genes were carried by 769 (91%) of the 842 isolates. CG2 strains were significantly associated with higher levels of meropenem resistance, yet non-CG2 cases were over-represented among the deaths compared with CG2 cases. CONCLUSIONS: CRAb infection types and clinical outcomes differed significantly across regions. Although CG2 strains remained predominant, non-CG2 strains were associated with higher mortality. Clinical Trials Registration. NCT03646227.

Tendencias de los fenotipos de resistencia bacteriana en hospitales públicos y privados de alta complejidad de Colombia / Trends of bacterial resistance phenotypes in high-complexity public and private hospitals in Colombia

Objetivo. Describir y comparar las frecuencias de los fenotipos de resistencia bacteriana de microorganismos obtenidos de pacientes en unidades de cuidados intensivos (UCI) y otros servicios de hospitalización (no UCI) públicos y privados de alta complejidad de Colombia. Métodos. Estudio observacional, analítico, retrospectivo y multicéntrico, en el cual se consolidaron los registros de los aislamientos bacterianos y los fenotipos de resistencia bacteriana de los microorganismos obtenidos de pacientes atendidos en UCI y no UCI de 79 hospitales públicos y privados de alta complejidad en el período de enero de 2007 a diciembre de 2009. La información se analizó con el programa WHONET® versión 5.5 (OMS) de acuerdo con las recomendaciones del Instituto de Estándares Clínicos y de Laboratorio 2009 y se resumió en un formato de extracción de datos en Excel®. Se realizó un análisis descriptivo en el cual se calcularon proporciones. El análisis de tendencias se realizó mediante la prueba de correlación de rangos de Spearman. Resultados. Las tendencias de los fenotipos de resistencia bacteriana de 2007 a 2009 muestran un comportamiento incremental en la proporción de Enterococcus faecium resistente a vancomicina, Klebsiella pneumoniae resistente a imipenem y a ciprofloxacina, Escherichia coli resistente a ceftazidima, y Enterobacter cloacae resistente a cefotaxima (ρ = 1, P < 0,01) y una disminución de la proporción de los fenotipos E. coli resistente a ciprofloxacina, K. pneumoniae resistente a ceftazidima, Staphylococcus aureus resistente a oxacilina, y Pseudomonas aeruginosa resistente a ceftazidima y a ciprofloxacina (ρ = –1, P < 0,01). Conclusiones. El análisis de tendencias presentado en este estudio constituye la línea de base para el establecimiento de un subsistema nacional de vigilancia epidemiológica. Las tendencias observadas muestran que la resistencia bacteriana a los antimicrobianos en el ámbito hospitalario es un fenómeno dinámico en Colombia y son evidencia de la emergencia de los fenotipos Efa-van y Kpn-imp en los hospitales.

Objective. Describe and compare the frequency of bacterial resistance phenotypes of microorganisms obtained from patients in intensive care units (ICU) and other (non- ICU) high-complexity public and private hospital services in Colombia. Methods. A retrospective observational, analytical, multicenter study was conducted. The records from January 2007 to December 2009 on bacterial isolates and bacterial resistance phenotypes of microorganisms obtained from ICU and non- ICU patients in 79 high-complexity public and private hospitals were consolidated. The information was analyzed with the WHONET® 5.5 (WHO) software, following the 2009 recommendations of the Clinical and Laboratory Standards Institute, and summarized on an Excel® spreadsheet. A descriptive analysis with the calculation of proportions was performed. The trends were analyzed with Spearman rank correlation. Results. The 2007–2009 trends for bacterial resistance phenotypes show increased percentages of vancomycin-resistant Enterococcus faecium, imipenem-resistant Klebsiella pneumoniae, ciprofloxacin-resistant K. pneumoniae, ceftazidime-resistant Escherichia coli and cefotaxime-resistant Enterobacter cloacae (r = 1, P < 0.01), and reduced percentages of ciprofloxacin-resistant E. coli, ceftazidime-resistant K. pneumoniae, oxacillinresistant Staphylococcus aureus, ceftazidime-resistant Pseudomonas aeruginosa, and ciprofloxacin-resistant P. aeruginosa (r = –1, P < 0.01). Conclusions. The trend analysis presented in this study is the baseline for establishing a national epidemiological surveillance subsystem. The trends observed reveal that bacterial resistance to antimicrobial drugs in hospitals in Colombia is a dynamic phenomenon, with evidence of the emergence of vancomycin-resistant E. faecium and imipenem-resistant K. pneumoniae phenotypes in the hospitals.

[Trends of bacterial resistance phenotypes in high-complexity public and private hospitals in Colombia]. / Tendencias de los fenotipos de resistencia bacteriana en hospitales públicos y privados de alta complejidad de Colombia.

OBJECTIVE: Describe and compare the frequency of bacterial resistance phenotypes of microorganisms obtained from patients in intensive care units (ICU) and other (non-ICU) high-complexity public and private hospital services in Colombia. METHODS: A retrospective observational, analytical, multicenter study was conducted. The records from January 2007 to December 2009 on bacterial isolates and bacterial resistance phenotypes of microorganisms obtained from ICU and non-ICU patients in 79 high-complexity public and private hospitals were consolidated. The information was analyzed with the WHONET(®) 5.5 (WHO) software, following the 2009 recommendations of the Clinical and Laboratory Standards Institute, and summarized on an Excel(®) spreadsheet. A descriptive analysis with the calculation of proportions was performed. The trends were analyzed with Spearman rank correlation. RESULTS: The 2007-2009 trends for bacterial resistance phenotypes show increased percentages of vancomycin-resistant Enterococcus faecium, imipenem-resistant Klebsiella pneumoniae, ciprofloxacin-resistant K. pneumoniae, ceftazidime-resistant Escherichia coli and cefotaxime-resistant Enterobacter cloacae (r = 1, P < 0.01), and reduced percentages of ciprofloxacin-resistant E. coli, ceftazidime-resistant K. pneumoniae, oxacillin-resistant Staphylococcus aureus, ceftazidime-resistant Pseudomonas aeruginosa, and ciprofloxacin-resistant P. aeruginosa (r = -1, P < 0.01). CONCLUSIONS: The trend analysis presented in this study is the baseline for establishing a national epidemiological surveillance subsystem. The trends observed reveal that bacterial resistance to antimicrobial drugs in hospitals in Colombia is a dynamic phenomenon, with evidence of the emergence of vancomycin-resistant E. faecium and imipenem-resistant K. pneumoniae phenotypes in the hospitals.