Regarding CPAP, the following are true EXCEPT

(B). Warm humidified oxygen should be provided at a concentration initially sufficient to keep arterial oxygen pressure between 50 and 70 mm Hg (91-95% saturation) in order to maintain normal tissue oxygenation while minimizing the risk of oxygen toxicity. lf oxygen saturation cannot be kept >90% at inspired oxygen concentrations of 40-70% or greater, applying CPAP at a pressure of 5-10 cm H2O via nasal prongs is indicated and usually produces a rapid improvement in oxygenation. CPAP reduces collapse of surfactant-deficient alveoli and improves both FRC and ventilation-perfusion matching