Figure 1.

Animal model instrumentation. AB, abdomen signal; BiPAP™, apparatus delivering inspiratory positive airway pressure and continuous positive airway pressure (Respironics, Monroeville, PA, USA); Pabd, abdominal pressure; Part, arterial pressure; Paw, airway pressure; Ppl, pleural pressure; RC, rib cage signal; SUM, summed signal from rib cage and abdomen.