Several factors can influence oxygenation monitoring and respiratory support through oxygen therapy: the type of oximeter used, skin pigmentation, and the oxygenation target. It is essential to have an accurate measurement of SpO2 in order to optimize the flow of oxygen or FiO2 administered to patients. The question arises as to the impact of these confounding factors on the FiO2 set during high-flow nasal oxygen therapy. The aim of the study is to evaluate the impact of the oxygenation target and the oximeter used on FiO2 in patients receiving high-flow nasal oxygen therapy.
≥ 18 years of age
Admiitted in intensive care unit
Presence of an arterial catheter
Ongoing on high flow nasal oxygen therapy with SpO2 between 88 and 100% with a FiO2 between 40 and 80% with the usual oximeter .
No SpO2 signal with oximeter in use
False nails or nail polish
Methemoglobinemia >0.015 on last available arterial gas
Patient in isolation (multi-resistant bacteria, C-Difficile, SARS-CoV-2 ...)