RESUMO
OBJECTIVE: to investigate the association between central line-associated bloodstream infections and clinical and care variables of intensive care unit patients with COVID-19 hospitalized at a reference public health institution. METHOD: a case-control study. RESULTS: the study sample consisted of 70 patients diagnosed with central line-associated bloodstream infections (case group) and 70 non-infected patients (control group). Most patients were male, with mean age of 57.93±13.93 years old and provided with a double lumen catheter. Median time of central line-associated bloodstream infections onset was 11 (8-18) days. Longer time on mechanical ventilation ( P =0.014; OR: 1.79; 95% CI: 0.91-3.51) and prone position ( P =0.017; OR: 2.41; 95% CI: 1.22-4.81) were associated with central line-associated bloodstream infections onset. CONCLUSION: longer time on invasive mechanical ventilation and prone position contributed to central line-associated bloodstream infections onset in COVID-19 patients.
Assuntos
COVID-19 , Infecções Relacionadas a Cateter , Cateterismo Venoso Central , Respiração Artificial , Humanos , Masculino , COVID-19/complicações , COVID-19/epidemiologia , Pessoa de Meia-Idade , Feminino , Estudos de Casos e Controles , Idoso , Respiração Artificial/estatística & dados numéricos , Cateterismo Venoso Central/efeitos adversos , Adulto , Infecções Relacionadas a Cateter/epidemiologia , Unidades de Terapia Intensiva , Decúbito VentralRESUMO
Objective: to investigate the association between central line-associated bloodstream infections and clinical and care variables of intensive care unit patients with COVID-19 hospitalized at a reference public health institution. Method: a case-control study. Results: the study sample consisted of 70 patients diagnosed with central line-associated bloodstream infections (case group) and 70 non-infected patients (control group). Most patients were male, with mean age of 57.93±13.93 years old and provided with a double lumen catheter. Median time of central line-associated bloodstream infections onset was 11 (8-18) days. Longer time on mechanical ventilation ( P =0.014; OR: 1.79; 95% CI: 0.91-3.51) and prone position ( P =0.017; OR: 2.41; 95% CI: 1.22-4.81) were associated with central line-associated bloodstream infections onset. Conclusion: longer time on invasive mechanical ventilation and prone position contributed to central line-associated bloodstream infections onset in COVID-19 patients.
Objetivo: investigar la asociación entre infecciones de la circulación sanguínea relacionadas con catéter venoso central y variables clínicas y asistenciales de pacientes con COVID-19 ingresados en la unidad de cuidados intensivos de una institución pública de salud de referencia. Método: un estudio caso-control. Resultados: la muestra del estudio estuvo compuesta por 70 pacientes con diagnóstico de infección de la circulación sanguínea relacionada con catéter venoso central (grupo caso) y 70 pacientes no infectados (grupo control). La mayoría de los pacientes eran del sexo masculino, con edad media de 57,93±13,93 años y provistos de catéter de doble luz. El tiempo medio de aparición de las infecciones del torrente sanguíneo asociadas a catéter venoso central fue de 11 (8-18) días. Un mayor tiempo en ventilación mecánica ( P =0,014; RP: 1,79; IC 95%: 0,91-3,51) y en posición de decúbito prono ( P =0,017; RP: 2,41; IC del 95 %: 1,22-4,81) se asociaron con la aparición de infecciones de la circulación sanguínea relacionadas con catéter venoso central. Conclusión: un tiempo más prolongado con ventilación mecánica invasiva y posición de decúbito prono contribuyeron a la aparición de infecciones de la circulación sanguínea relacionadas con catéter venoso central en pacientes con COVID-19.
Objetivo: investigar a associação entre infecção primária de corrente sanguínea relacionada a cateter venoso central e variáveis clínicas e assistenciais de pacientes com COVID-19 internados na unidade de terapia intensiva de uma instituição pública de saúde de referência. Método: estudo caso-controle. Resultados: o estudo foi composto por 70 pacientes com diagnóstico de infecção primária de corrente sanguínea relacionada a cateter venoso central (grupo caso) e 70 pacientes sem infecção (grupo controle). Pacientes predominantemente do sexo masculino, média de idade de 57,93±13,93 anos e portadores de cateter de duplo lúmen. A mediana de tempo de ocorrência das infecções primárias de corrente sanguínea relacionadas a cateter venoso central foi de 11 (8-18) dias. Maior tempo em ventilação mecânica ( P =0,014; RP: 1,79; IC 95%: 0,91-3,51) e posição prona ( P =0,017; RP: 2,41; IC 95%: 1,22-4,81) foram associados à ocorrência de infecções primárias de corrente sanguínea relacionadas a cateter venoso central. Conclusão: maior tempo em ventilação mecânica invasiva e posição prona contribuíram para a ocorrência de infecções primárias de corrente sanguínea relacionadas a cateter venoso central em pacientes com COVID-19.
Assuntos
Humanos , Respiração Artificial , Estudos de Casos e Controles , Sepse , Cateteres Venosos Centrais , COVID-19 , Unidades de Terapia IntensivaRESUMO
AIM: To investigate the influence of the CagA diversity in Helicobacter pylori (H. pylori) strains from Colombia on the host cell biology. METHODS: Eighty-four H. pylori-cagA positive strains with different Glu-Pro-Ile-Tyr-Ala (EPIYA) motifs patterns, isolated from patients with gastritis (n = 17), atrophic gastritis (n = 17), duodenal ulcer (n = 16), intestinal metaplasia (n = 16) and gastric cancer (n = 18), were included. To determine the integrity of the cag pathogenicity island (cagPAI) we evaluated the presence of cagA, cagT, cagE, and cag10 genes by polymerase chain reaction. AGS gastric epithelial cells were infected with each strain and assayed for translocation and tyrosine phosphorylation of CagA by western blot, secretion of interleukin-8 (IL-8) by enzyme-linked immuno sorbent assay after taking supernatants from cocultures and cell elongation induction. For cell elongation quantification, coculture photographs were taken and the proportion of "hummingbird" cells (> 15 µm) was determined. RESULTS: Overall 72% (60/84) of the strains were found to harbor a functional cagPAI. Levels of phosphorylated CagA were significantly higher for isolates from duodenal ulcer than the ones in strains from gastritis, atrophic gastritis, intestinal metaplasia and gastric cancer (49.1% ± 23.1% vs 21.1% ± 19.5%, P < 0.02; 49.1% ± 23.1% vs 26.2% ± 14.8%, P < 0.045; 49.1% ± 23.1% vs 21.5% ± 19.5%, P < 0.043 and 49.1% ± 23.1% vs 29.5% ± 27.1%, P < 0.047 respectively). We observed variable IL-8 expression levels ranging from 0 to 810 pg/mL and from 8.8 to 1442 pg/mL at 6 h and 30 h post-infection, respectively. cagPAI-defective strains did not induce detectable levels of IL-8 at 6 h post-infection. At 30 h post-infection all strains induced IL-8 expression in AGS cells, although cagPAI-defective strains induced significantly lower levels of IL-8 than strains with a functional cagPAI (57.1 ± 56.6 pg/mL vs 513.6 ± 338.6 pg/mL, P < 0.0001). We did not observe differences in the extent of cell elongation induction between strains with a functional or a defective cagPAI in 6 h cocultures. At 24 h post infection strains with functional cagPAI showed high diversity in the extent of hummingbird phenotype induction ranging from 7% to 34%. cagPAI defective strains induced significantly lower levels of elongation than strains with functional cagPAI with one or more than one EPIYA-C motif (15.1% ± 5.2% vs 18.9% ± 4.7%, P < 0.03; and 15.1% ± 5.2% vs 20.0% ± 5.1%, P < 0.003 respectively). No differences were observed in cellular elongation induction or IL-8 expression among H. pylori strains bearing one and more than one EPIYA-C motifs, neither at 6 h nor at 24 h of coculture. There were no associations between the levels of induction of cell elongation or IL-8 expression and number of EPIYA motifs or pathology. CONCLUSION: The present work describes a lack of association between H. pylori CagA protein EPIYA motifs variations from Colombian isolates and disease-associated cellular responses.
RESUMO
AIM: To investigate Helicobacter pylori (H. pylori) CagA diversity and to evaluate the association between protein polymorphisms and the occurrence of gastric pathologies. METHODS: One hundred and twenty-two clinical isolates of H. pylori cultured from gastric biopsies obtained from Colombian patients with dyspepsia were included as study material. DNA extracted from isolates was used to determine cagA status, amplifying the C-terminal cagA gene region by polymerase chain reaction. One hundred and six strains with a single amplicon were sequenced and results were used to characterize the 3' variable region of the cagA gene. To establish the number and type of tyrosine phosphorylation motifs Glutamine acid-Proline-Isoleucine-Tyrosine-Alanine (EPIYA) bioinformatic analysis using Amino Acid Sequence Analyzer-Amino Acid Sequence Analyzer software was conducted. Analysis of the association between the number of EPIYA motifs and the gastric pathology was performed using chi(2) test and analysis of the presence of EPIYA-C motifs in relation to the pathology was made by logistic regression odds ratios. Comparisons among EPIYA types found and those reported in GenBank were performed using a proportion test in Statistix Analytical Software version 8.0. RESULTS: After amplification of the 3' of the cagA gene, 106 from 122 isolates presented a single amplicon and 16 showed multiple amplicons. As expected, diversity in the size of the cagA unique fragments among isolates was observed. The 106 strains that presented a single amplicon after 3' cagA amplification came from patients with gastritis (19 patients), atrophic gastritis (21), intestinal metaplasia (26), duodenal ulcer (22) and gastric cancer. DNA sequence analysis showed that the differences in size of 3' cagA unique fragments was attributable to the number of EPIYA motifs: 1.9% had two EPIYA motifs, 62.3% had three, 33.0% had four and 2.8% had five motifs. The majority of tested clinical strains (62.3%) were found to harbor the ABC combination of EPIYA motifs and a significant statistical difference was observed between the frequencies of ABCC tyrosine phosphorylation motifs and Western strains sequences deposited in GenBank. CONCLUSION: The present report describes a lack of association between H. pylori CagA-protein polymorphisms and pathogenesis. ABCC high frequency variations compared with Western-strains sequences deposited in GenBank require more investigation.