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HFNO/NIV

The decision should be tailored to the patient’s specific condition, comfort, and response to therapy. If HFNO is not effective or the patient deteriorates, NIV can be escalated as the next step before invasive mechanical ventilation.
 
HFNO is often the first-line option for mild ARDS because it is less invasive, better tolerated, and effective in improving oxygenation.

NIV is generally considered when moderate ARDS presents with increased work of breathing or significant hypoxemia, as it can provide more robust support for ventilation and oxygenation.
 

FeatureHFNONIV
ComfortGenerally better tolerated, non-invasiveCan be uncomfortable due to masks or tight seals
Alveolar recruitmentMildly improves oxygenation, less effective for alveolar recruitmentMore effective at alveolar recruitment and reducing atelectasis
Risk of aspirationLower risk of aspirationHigher risk of aspiration due to mask seal
Indications in ARDSPreferred in mild/moderate ARDS, especially when avoiding intubationPreferred in moderate ARDS with more significant respiratory distress
Effectiveness in oxygenationImproves oxygenation, especially when combined with humidificationMay provide better oxygenation and ventilation support, especially with BiPAP
Ventilator-associated complicationsFewer complications compared to NIVMore complications, including risk of barotrauma and aspiration
 
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