Fig. 3From: Optimizing high-flow nasal cannula flow settings in adult hypoxemic patients based on peak inspiratory flow during tidal breathingThe correlation between flow ratio and FIO2, peak inspiratory and expiratory pressure at trachea in the in vitro study. X-axis is the flow ratio of setting HFNC flow to peak tidal inspiratory flow, Y-axis is the trachea FIO2 (left), peak inspiratory (middle) and peak expiratory pressure (right). As the flow ratio increased, both peak inspiratory and expiratory pressure increased, while FIO2 stabilized when flow ratio was ≥ 1. FIO2, fraction of inspired oxygenBack to article page