FIGURE 4.

Transition from assist mechanical breath to intermittent (unstable) reverse trigger and stable reverse trigger. Traces were acquired in patient No.2. Dotted line denoted the initiation of each neural breath. Panel (A) showed that each neural breath arose before a mechanical breach initiation or the phase delay > 0 (Assist breath); Panel (B) showed the coexistence of Assist breath and Control breath with stable reverse trigger. The red solid line box included two Control breath with stable reverse trigger (the 4th and 5th breath). Panel (C) showed that each neural breath arose behind a mechanical breach initiation or the phase delay < 0 (Control breath with stable reverse trigger). Paw, airway pressure; PL, transpulmonary pressure; Peso, esophageal pressure.