[High-flow nasal oxygen for severe hypoxemia after cardiac surgery]

Area of Science:

• Cardiology
• Intensive Care Medicine
• Respiratory Therapy

Background:

• High-flow nasal oxygen (Optiflow™) is established in pediatric intensive care but its efficacy in adult postoperative cardiac surgery patients with hypoxemia requires evaluation.
• Postoperative hypoxemia is a common complication following cardiac surgery, necessitating effective oxygenation strategies.

Purpose of the Study:

• To assess the effectiveness and tolerance of the Optiflow™ high-flow nasal oxygen system in adult patients experiencing postoperative hypoxemia after cardiac surgery.
• To compare Optiflow™ with the conventional high-flow oxygen face mask in terms of gas exchange and clinical outcomes.

Main Methods:

• A prospective, open-label study involving 40 adult cardiac surgery patients with SpO2 <0.96 on 50% Venturi mask oxygen.
• Patients were treated with either Optiflow™ (O group) or a classical high-flow oxygen face mask (M group).
• Gas exchange, hypoxemia duration, ICU stay, and adverse events were monitored. Patient tolerance was assessed via pain and satisfaction scales, and mouth dryness.

Main Results:

• No significant differences were observed between groups regarding duration of hypoxemia, ICU stay, pneumonia occurrence, re-intubation, non-invasive ventilation, or catecholamine requirements.
• Patients receiving Optiflow™ reported significantly higher satisfaction (P<0.001) and experienced less mouth dryness (P<0.001) compared to the face mask group.
• Pain levels were comparable between the two treatment groups.

Conclusions:

• High-flow nasal oxygen (Optiflow™) offers improved tolerance, particularly in terms of patient satisfaction and reduced mouth dryness, for postoperative cardiac surgery patients compared to traditional face masks.
• While initial results suggest potential benefits in gas exchange, these findings require confirmation through larger, randomized controlled trials.