J Matern Fetal Neonatal Med 25 (supplement 4): 63 - 65, 2012. doi: 10.3109/14767058.2012.715008 Continuous Positive Airway Pressure (CPAP) In CPAP, constant pressure is maintained throughout the respiratory cycle, usually 5 to 7 cm H2O, but with no additional inspiratory pressure support.