Oxygen concentrators performance with nitrous oxide at 50:50 volume

Area of Science:

• Anesthesiology
• Medical Device Engineering

Background:

• Limited research exists on the safety of oxygen from concentrators during anesthesia with nitrous oxide.
• Evaluating oxygen delivery from concentrators in semi-closed rebreathing circuits is crucial.

Purpose of the Study:

• To assess the percentage of oxygen delivered by a concentrator when used with nitrous oxide in anesthesia.
• To evaluate the stability and safety of oxygen concentrators in a semi-closed rebreathing system.

Main Methods:

• Adult patients undergoing low-risk surgery were divided into two groups: oxygen from concentrators (O293) and oxygen with nitrous oxide (O293N2O).
• Fraction of inspired oxygen (FiO2) and oxygen concentration from fresh gas flow were measured every 10 minutes.
• The ratio of FiO2 to delivered oxygen concentration was compared between groups and over time.

Main Results:

• Thirty patients were studied in each group, with no significant difference in oxygen delivery over time.
• The O293 group showed a significant FiO2 improvement (p<0.001), while the O293N2O group had a significant decline (p<0.001).
• Pulse oximetry remained above 98.5% in both groups, indicating stable oxygen saturation.

Conclusions:

• The FiO2 decreased in the O293N2O mixture, but oxygen saturation remained high.
• Oxygen concentrators are a reliable oxygen source for short anesthetic procedures.
• Concentrators are suitable for use either alone or mixed with nitrous oxide at a 50:50 volume ratio.