Both HFNC and BiPAP can provide adequate ventilatory support for children with asthma exacerbation. In the subset of studies reporting oxygenation outcomes (2-3 studies), BiPAP was associated with a small increase in PaO2/SaO2 compared with HFNC; this limited signal requires confirmation in larger, high-quality clinical trials.
Cheng et al. (Sun,) studied this question.