摘要
Helmet continuous positive airway pressure(H-CPAP)is a form of non-invasive respiratory support that improves gas exchange and respiratory mechanics during acute hypoxemic respiratory failure,by maintaining a constant positive endexpiratory pressure(PEEP)and delivering inspiratory oxygen fractions up to 100%.[1]The effect of H-CPAP comprises increasing end-expiratory lung volume,avoiding alveolar collapse,reducing shunt,and enhancing ventilation-perfusion ratios.[2]These effects improve oxygenation and may further reduce the work of breathing because the respiratory system is shifted to a more compliant position on its pressure-volume curve.
