Figure 2From: Maintained inspiratory activity during proportional assist ventilation in surfactant-depleted cats early after surfactant instillation: phrenic nerve and pulmonary stretch receptor activityAirway pressure (P aw ), tidal volume (V T ), esophageal pressure (P eso ) and phrenic nerve activity (PNA) during CPAP and PAV after lung lavage. Note the immediate decrease in PNA and the decrease in esophageal pressure on transition from CPAP to PAV, showing the combined breathing effort and elastic unloading during PAV. AU, arbitrary units.Back to article page