Fig. 2
From: Novel method of transpulmonary pressure measurement with an air-filled esophageal catheter
Esophageal-to-airway pressure change ratios in controlled and assisted modes. Esophageal-to-airway pressure change ratios: a in volume-controlled mode, induced by external chest compressions during end-expiratory occlusion (dynamic positive pressure occlusion test), using both balloon (left) and catheter (right) method; b in assisted mode, induced by spontaneous inspiratory efforts against airway occlusion test (Baydur’s maneuver). For comparison in b, pleural-to-airway pressure change ratios obtained in patients with pleural pressure measurements. Black lines indicate means of ratios