High-Flow Oxygen Therapy in Tracheostomized Subjects With Prolonged Mechanical Ventilation: A Randomized Crossover...

Area of Science:

• Respiratory Physiology
• Critical Care Medicine

Background:

• High-flow oxygen therapy via tracheostomy (HFT) is used for ventilator disconnection in tracheostomized patients.
• The physiological effects of HFT in this population are not well understood.

Purpose of the Study:

• To evaluate the physiological effects of HFT compared to conventional oxygen therapy via T-tube in tracheostomized patients.
• To determine if HFT reduces inspiratory effort and improves breathing patterns during ventilator disconnection.

Main Methods:

• A randomized crossover study involving adult tracheostomized patients during temporary ventilator disconnection.
• Patients received pressure support ventilation (PSV), followed by either HFT or conventional oxygen via T-tube in a randomized sequence.
• Physiological parameters including esophageal pressure, breathing frequency, and gas exchange were measured.

Main Results:

• Inspiratory effort (sPTPes) and breathing frequency increased significantly during unassisted breathing (HFT and conventional O2) compared to PSV.
• No significant difference in inspiratory effort was found between HFT and conventional oxygen therapy.
• Oxygen saturation was higher with conventional oxygen therapy compared to HFT.

Conclusions:

• HFT via tracheostomy offers no significant physiological advantage over conventional oxygen therapy via T-tube for unassisted breathing in tracheostomized patients.
• Both methods increase inspiratory effort and breathing frequency compared to PSV.