Accuracy of PaO₂/FiO₂ calculated from SpO₂ for severity assessment in ED patients with pneumonia

Abstract

The Ellis equation was more accurate than the Rice equation for estimating PaO2 /FiO2 , especially at higher levels of P/F ratio. Estimation of PaO2 /FiO2 from SpO2 is accurate enough for initial oxygenation assessment. Ellis and Rice equations could misclassify 20% and 30% of patients, respectively, at higher levels of PaO2 /FiO2 . For patients with abnormal oxygenation falling near thresholds for clinical decision making, arterial blood gas measurement preferably on room air is more accurate.

High‐flow nasal cannula oxygen therapy for acute respiratory failure in a non‐intensive geriatric setting

“…Patients were initially treated with COT or NIV, through one of the following supports: (i) bi‐level NIV through a face mask (inspiratory pressure: 14–20 cmH 2 O; expiratory pressure: 4–6 cmH 2 O); (ii) continuous positive airway pressure through a Boussignac mask with oxygen flow ≥15 L/min; or (iii) COT, by nasal prongs or Venturi mask. During COT or NIV, FiO 2 was approximated as follows: 0.21 + (0.03 × L/min of O 2 flow) and a FiO 2 ≥0.5 was applied. Patients were then switched to HFNC due to insufficient oxygenation (SpO 2 <92%) after at least 1 h of COT or NIV, or to assure better comfort.…”

Nonlinear Imputation of Pao 2/Fio 2 From Spo 2/Fio 2 Among Mechanically Ventilated Patients in the ICU: A Prospective, Observational Study

“…(15–18) To externally validate these retrospective observations, we undertook a prospective study, with attention to patient characteristics that might affect the accuracy of imputation. We hypothesized that non-linear imputation was superior to other imputation methods and that the receipt of vasopressors and darker skin pigmentation would be associated with less accurate imputation.…”

Year in review 2015: Lung cancer, pleural diseases, respiratory infections, bronchiectasis and tuberculosis, bronchoscopic intervention and imaging

“…Sanz et al . hypothesized that partial oxygen concentration/inspired oxygen fraction (PaO2/FiO2) from percutaneous oxygen saturation (SpO2) by the Ellis or Rice equations might correlate with PaO2/FiO2 determined by arterial blood gases.…”