At the start of the recording, respiratory rate is >80/min, the SiPAP delivers a pressure peak with alternate breaths. At the start of the recording, respiratory rate is >80/min, the SiPAP delivers a pressure peak with alternate breaths. Dotted arrows show breaths detected by the SiPAP capsule, confirmed by respiratory inductance plethysmography (RIP), but without a correlating SiPAP pressure peak. As the respiratory rate slows in the second half of the recording, the SiPAP delivers a pressure peak with every spontaneous breath. L S Owen et al. Arch Dis Child Fetal Neonatal Ed 2015;100:F24-F30 Copyright © BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health. All rights reserved.