RESUMEN
BACKGROUND: The need for reducing unnecessary antibiotic treatment is being emphasized in the management of urinary tract infections (UTI), a disease frequent in childhood. An ideal test should provide early diagnosis without the waiting times of urine culture, but even a simple test of exclusion could significantly improve patient management. METHODS: We evaluated the sensitivity, specificity, negative and positive predictive value of automated microscopy IRIS iQ200 combined with the dipstick analyses in children with suspected UTI. Multivariable logistic regression analysis was used to identify the set of variables that best predict positive culture results and develop a numerical risk score. RESULTS: Of 474 consecutive urine samples retrospectively analyzed, 69 were positive at urine culture with prevalence of infection of 14.6%. Parameters significantly associated with the presence of infection in multivariable analysis were age <1 year (p<0.001), leukocyte esterase ≥ 15×10^6/L (p<0.001), number of small particles (ASP) ≥ 5500 × 10^6/L (p<0.001) and bacteria ≥ 3 × 10^6/L (p=0.01). The derived score ranged from 0 to 10, with higher values indicating higher risk of UTI. The area under the score ROC curve was 79% (95% CI 0.72-0.85), and was better than those of the individual urinary chemical and microscopic analyses. CONCLUSIONS: This routine method could improve the management of UTI in children by early identifying patients with low probability of infection, for whom antibiotic treatment can be withheld until the results of urine culture become available.
Asunto(s)
Urinálisis/métodos , Infecciones Urinarias/diagnóstico , Infecciones Urinarias/orina , Adolescente , Niño , Preescolar , Análisis Discriminante , Reacciones Falso Positivas , Femenino , Humanos , Lactante , Modelos Logísticos , Masculino , Análisis Multivariante , Valor Predictivo de las Pruebas , Estudios Retrospectivos , Infecciones Urinarias/tratamiento farmacológicoRESUMEN
BACKGROUND: Graft coronary artery vasculopathy is the main cause of late morbidity and mortality in pediatric cardiac allograft recipients. Growing evidence suggests that elevated plasma homocysteine levels are associated with cardiac allograft vasculopathy following heart transplantation. The purpose of this study was to evaluate the effect of vitamin supplementation as a potential strategy for reducing homocysteine levels in pediatric heart transplant recipients and examine creatinine levels as potential determinants of plasma homocysteine concentration after transplantation. METHODS: We studied 27 pediatric heart transplant patients with homocysteine levels higher than normal. All children received vitamin supplementation (vitamin B(12), vitamin E, vitamin A and folic acid). During treatment, levels of homocysteine, vitamins and creatinine were evaluated after 3, 6, 9 and 12 months. RESULTS: We observed a significant homocysteine concentration decrease after treatment at every determination, whereas no significant change occurred for creatinine. Vitamin B(12) serum level increased markedly, whereas folic acid, vitamin E and vitamin A serum levels showed only minor increases. CONCLUSIONS: We observed a significant increase of mean levels of vitamin B(12) and a moderate increase in the other 3 vitamins. We also observed a significant reduction in homocysteine levels, which returned to normal levels for age. In our patients, there was a correlation, before and after treatment, between homocysteine and creatinine levels, but there was no a direct correlation between creatinine serum levels and homocysteine reduction. We conclude that vitamin supplementation reduces and may normalize homocysteine serum level after pediatric heart transplantation.