The effects of asymmetrical versus symmetrical high-flow nasal cannula on respiratory muscle activity in acute hypoxaemic respiratory failure and chronic obstructive pulmonary disease: A randomised crossover study.
Chakorn Lapanan, Annia Fleur Schreiber, Nattapat Wongtirawit et al.
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In 30 seconds
This randomized crossover study evaluated the effects of asymmetrical versus symmetrical high-flow nasal cannula (HFNC) on respiratory muscle activity in 20 subjects with acute hypoxaemic respiratory failure and 18 with COPD exacerbation. Both interfaces significantly reduced diaphragm and intercostal muscle workload, with asymmetrical HFNC showing greater reductions in respiratory rate and power of breathing in acute hypoxaemic respiratory failure (p < 0.001).
Key findings
- Both HFNC interfaces significantly reduced TFdi, TFpi, and power of breathing compared to baseline (p < 0.05).
- Asymmetrical HFNC led to a greater reduction in respiratory rate compared to symmetrical HFNC in acute hypoxaemic respiratory failure (p < 0.001).
- In COPD exacerbation, asymmetrical HFNC also reduced respiratory rate more than symmetrical HFNC (p < 0.001).
Why it matters
Understanding the differential effects of HFNC interfaces on respiratory muscle activity can guide clinicians in optimizing treatment strategies for patients with acute hypoxaemic respiratory failure and COPD exacerbations, potentially improving patient outcomes.