Use of ventilation/perfusion mismatch to guide individualised CPAP level selection in preterm infants: a feasibility trial.

Objective: To measure within-subject changes in ventilation/perfusion (V'/Q') mismatch in response to a protocol of individualised nasal continuous positive airway pressure (CPAP) level selection.

Design: Single-arm, non-randomised, feasibility trial.

Setting: Three centres in the Children's Hospital of Philadelphia neonatal care network.