title: [Relationship between PAO2/FIO2 and SATO2/FIO2 with mortality and duration of admission in critically ill children].
abstract: OBJECTIVE
  The aim of this study is to analyse the relationships and the association between PaO(2)/FiO(2) and SatO(2)/FiO(2with) the duration of admission in Paediatric Intensive Care Units (PICU) and mortality, and to study the relationships between both ratios.
  
  
  METHODS
  A retrospective study was conducted on PICU patients in whom a gas analysis was performed in the first twenty-four hours of admission. Demographic, clinical and ventilation variables were collected, and the relationship between PaO(2)/FiO(2) and SatO(2)/FiO(2) with days of admission and mortality was determined. Finally, the best cut-off points of SatO(2)/FiO(2) were determined for PaO(2)/FiO(2) values greater and less than 200.
  
  
  RESULTS
  Of 512 patients admitted during one year, a gas analysis was performed on 358, 65% of those in arterial blood. The median duration of hospitalization was two days and there were 11 patient deaths. There was a low negative correlation between the values of PaO(2)/FiO(2) and SatO(2/)FiO(2) on admission to PICU and with duration of admission, and an inverse association with mortality (P<.01). This association was stronger for the PaO(2)/FiO(2) ratio in patients with heart disease, those undergoing invasive mechanical ventilation, and for arterial blood samples. PaO(2)/FiO(2) and SatO(2)/FiO(2) ratios were significantly correlated with each other. A cut-off of 200 for SatO(2)/FiO(2) had a sensitivity of 97.5% for classifying patients with PaO(2)/FiO(2) values lower or higher than 200.
  
  
  CONCLUSIONS
  PaO(2)/FiO(2) and SatO(2)/FiO(2) index are markers of severity in critically ill patients. In patients who do not have an arterial line, SatO(2)/FiO(2) index can be used for assessment of oxygenation as an indicator of severity in children in critical condition.
authors.affiliation: Servicio de Cuidados Intensivos Pediátricos, Hospital General Universitario Gregorio Marañón, Universidad Complutense de Madrid, España.
authors.forename: M C
authors.initials: MC
authors.lastname: Miranda
authors.forename: J
authors.initials: J
authors.lastname: López-Herce
authors.forename: M C
authors.initials: MC
authors.lastname: Martínez
authors.forename: A
authors.initials: A
authors.lastname: Carrillo
mesh_terms: D002675:Child, Preschool; D003422:Critical Care; D016638:Critical Illness; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D007362:Intensive Care Units; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D012189:Retrospective Studies
chemical_list: D010100:Oxygen