Concentrações de interleucina-2 na secreção nasofaríngea de crianças com bronquiolite viral aguda pelo vírus respiratório sincicial

Abstract

Objective: To assess interleukin-2 concentrations in nasopharyngeal secretion of children (0-24 months) with acute respiratory syncytial virus bronchiolitis, within the first 12 hours of hospital admission, and compare the levels of IL-2 with the severity of the illness.Methods: Prospective study performed between June and August 1999. The study included 62 patients, previously healthy, hospitalized with acute viral bronchiolitis characterized by recent prodromes of coryza and/or nasal obstruction, which evolved to at least two of the following signs: respiratory dysfunction, tachypnea, wheezing or rales, and detection of respiratory syncytial virus in nasopharyngeal aspirate. The nasopharyngeal specimens were collected within 12 hours of hospital admission. The interleukin-2 levels were obtained by enzyme immunoassay. Severity of illness was assessed through oxygen saturation by pulse oximetry, Modified Clinical Score System, time of supplemental oxygen required, length of hospital stay, and mechanical ventilation. Spearman s correlation and Kruskal-Wallis test were used to compared these variables in relation to the median of interleukin-2. The chi-square test was used for categorical analysis of interleukin-2.Results: The mean age of patients was 2.2 (1.3-4) months. Males comprised 54% of cases. Hemoglobin oxygen saturation by pulse oximetry at hospital admission was below 95% in 66.1% of patients. The mean time of supplemental oxygen use was 4.7 days (±3.54). The mean length of hospital stay was 4.25 days (±1.76). Mechanical ventilation was used in 4.8% of patients. The values of interleukin-2 in nasopharyngeal aspirates varied from 0 to 40,256 ng/ml with median of 86 ng/ml (4.4 457.3). The study showed no statistical difference between levels of IL-2 and severity of illness. Conclusions:The interleukin-2 levels showed a heterogeneous behavior. We found no association between interleukin-2 levels in nasopharyngeal secretion and respiratory syncytial virus bronchiolitis.J Pediatr (Rio J). 2004;80(4):315-20: Interleukin-2, acute viral bronchiolitis, respiratory syncytial virus, nasopharyngeal aspirates.

Systematic review and meta‐analysis of respiratory syncytial virus infection epidemiology in Latin America

“…After the screening by full text process, 136 studies were included for data extraction. During the data extraction process, 62 studies were excluded, leaving 74 for analyses (Figure ). Most studies were performed in pediatric populations from Brazil, Argentina, Chile, Mexico, and Uruguay.…”

“…Data available for resource use came from Argentina , Brazil , Chile , Colombia , Mexico , and Uruguay . Healthy children and patients with risk factors of prematurity, congenital heart disease, or chronic lung conditions were analyzed separately.…”