Velocity-based target flow rate for high-flow nasal cannula oxygen therapy

Area of Science:

• Pediatric Respiratory Medicine
• Critical Care
• Medical Device Technology

Background:

• Moderate to severe respiratory failure in infants and children often requires respiratory support.
• High-flow nasal cannula (HFNC) therapy is a common non-invasive ventilation method.
• Optimizing initial flow rate settings in HFNC is crucial for effective treatment.

Purpose of the Study:

• To retrospectively evaluate the tolerability and safety of using an average inspiratory flow velocity-based initial flow rate for HFNC in pediatric patients.
• To determine if this approach can be safely implemented in a hospital setting for moderate to severe respiratory failure.

Main Methods:

• Retrospective analysis of 33 pediatric patients (median age 2 months) with infection-related respiratory failure requiring HFNC.
• Inclusion criteria: dyspnea, pCO2 >50 mmHg or pH <7.320, and SpO2 <92%.
• Initial HFNC flow rates were calculated based on average inspiratory flow velocity and adjusted as needed.

Main Results:

• One of 33 patients (3%) did not tolerate HFNC.
• Of the 32 tolerating patients, 81% had initial flow rates within 1 L of the target.
• While some patients required increased oxygen or had persistent acidosis/hypercapnia, no pneumothorax occurred, and only one patient needed intubation.

Conclusions:

• The average inspiratory flow velocity-based initial flow rate for HFNC is well-tolerated and safe in pediatric patients with respiratory failure.
• This method may enhance the utilization of HFNC therapy in pediatric wards.
• Implementing this approach could potentially decrease the requirement for more invasive ventilation methods.