What may be considered for severe hypoxemia?

What may be considered for severe hypoxemia?

• A. Increased FiO2 alone
• B. Prone positioning in ARDS or ECMO
• C. Nasal decongestant therapy
• D. Bronchodilator inhalation only

Answer: (B)

Severe hypoxemia is best addressed by strategies that directly improve gas exchange and oxygen delivery. Prone positioning helps because it redistributes ventilation and perfusion in the lungs, promoting better matching of air to blood flow. When a patient with ARDS is turned onto their stomach, the dorsal (back) lung areas—often better perfused but poorly aerated when supine—become more aerated, while edema shifts away from those regions. This recruitment of dependent lung regions increases overall oxygenation and can make ventilation more effective. In the context of ECMO, prone positioning can be used to optimize oxygenation further and support lung-protective strategies. Increasing the fraction of inspired oxygen alone can help but is frequently insufficient in severe hypoxemia, especially when shunt is prominent. Nasal decongestants address nasal airflow rather than lung gas exchange, and bronchodilator inhalation targets reversible airway obstruction rather than core causes of severe hypoxemia.

Severe hypoxemia is best addressed by strategies that directly improve gas exchange and oxygen delivery. Prone positioning helps because it redistributes ventilation and perfusion in the lungs, promoting better matching of air to blood flow. When a patient with ARDS is turned onto their stomach, the dorsal (back) lung areas—often better perfused but poorly aerated when supine—become more aerated, while edema shifts away from those regions. This recruitment of dependent lung regions increases overall oxygenation and can make ventilation more effective. In the context of ECMO, prone positioning can be used to optimize oxygenation further and support lung-protective strategies.

Increasing the fraction of inspired oxygen alone can help but is frequently insufficient in severe hypoxemia, especially when shunt is prominent. Nasal decongestants address nasal airflow rather than lung gas exchange, and bronchodilator inhalation targets reversible airway obstruction rather than core causes of severe hypoxemia.