2. Patients with moderate to severe dyspnea requiring oxygen support (Nasal Cannula/Simple face mask/Venturi mask/non-rebreathermask/High flow nasal cannula/CPAP) with respiratory frequency ≥ 24/min, oxygen saturation on room air SpO2 <94% and SpO2/FiO2 ratio >89 and <357. And/or 3. Labor...