Vital sign predictors of severe influenza among children in an emergent care setting

Abstract

Background Decisions regarding the evaluation of children with influenza infection rely on the likelihood of severe disease. The role of early vital signs as predictors of severe influenza infection in children is not well known. Our objectives were to determine the value of vital signs in predicting hospitalization/recurrent emergency department (ED) visits due to influenza infection in children. Methods We conducted a prospective study of children aged 6 months to 8 years of age with influenza like illness evaluated at an ED/UC from 2016–2018. All children underwent influenza testing by PCR. We collected heart rate, respiratory rate and temperature, and converted heart rate (HR) and respiratory rate (RR) to z-scores by age. HR z scores were further adjusted for temperature. Our primary outcome was hospitalization/recurrent ED visits within 72 hours. Vital sign predictors with p< 0.2 and other clinical covariates were entered into a multivariable logistic regression model to determine odds ratios (OR) and 95% CI; model performance was assessed using the Brier score and discriminative ability with the C statistic. Results Among 1478 children, 411 (27.8%) were positive for influenza, of which 42 (10.2%) were hospitalized or had a recurrent ED visit. In multivariable analyses, adjusting for age, high-risk medical condition and school/daycare attendance, higher adjusted respiratory rate (OR 2.09, 95%CI 1.21–3.61, p = 0.0085) was a significant predictor of influenza hospitalization/recurrent ED visits. Conclusions Higher respiratory rate adjusted for age was the most useful vital sign predictor of severity among young children with PCR-confirmed influenza.

Clinical characteristics and prognostic marker for hospitalization in children with influenza infection in an emergency setting

“…Consequently, it is imperative to identify predictive factors for severe influenza. A previous publication revealed the yield of higher respiratory rate adjusted for age was the most useful vital sign predictor of severity among young children with PCR-confirmed influenza [ 8 ]. The present study revealed the yield of ESI level at the emergency setting.…”

“…Identifying children with influenza who may need hospitalization may lead to better influenza outcomes. Several clinical findings, such as elevated respiratory and heart rate, can assist physicians in identifying and prognosticating the extent of influenza infection in pediatric patients [ 7 , 8 ]. Laboratory investigations, such as the complete blood count, are frequently used to assess and define the severity of infections.…”