Correlation between oxyhaemoglobin saturation by pulse oximetry and partial pressure of oxygen in patients with acute respiratory failure.

C Cinesi-Gómez, P García-García, I López-Pelayo, J I Giménez, L M González-Torres, E Bernal-Morell

Revista Clínica Española 2017 December

OBJECTIVES: To ascertain the correlation between the partial pressure of oxygen (PaO2 ) and oxyhaemoglobin saturation by pulse oximetry (SpO2 ) in patients who were admitted to the emergency department with suspected acute respiratory failure.

MATERIAL AND METHODS: A prospective, observational multicentre study was conducted in the emergency departments of 3 Spanish hospitals.

RESULTS: The study included 166 patients who presented mean±standard deviation PaO2 , SpO2 and fraction of inspired oxygen (FiO2 ) values of 61.64±17.3mmHg, 87.61±8.8% and 0.28±0.15%, respectively. The median PaO2 /FiO2 and SpO2 /FiO2 ratios were 256.6 and 359.2, respectively. The correlation between PaO2 /FiO2 and the SpO2 /FiO2 was 0.745 (P<.001).

CONCLUSIONS: The SpO2 /FiO2 ratio can be used to calculate PaO2 /FiO2 and determine the oxygenation state of patients with acute respiratory failure.

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