Figure 1
From: Heart–lung interactions during neurally adjusted ventilatory assist
Schematic study protocol. After a baseline period of 30 minutes three levels of pressure support ventilation (PSV) and three levels of neurally adjusted ventilatory assist (NAVA) were applied in random order. Adequate PSV (PSVal) was chosen by an independent intensivist using predefined clinical criteria, and adequate NAVA (NAVAal) using a titration procedure [6]-[9]. NAVAhigh, highest level with constant breathing pattern or a maximum 200% of NAVAal; NAVAlow, 50% of NAVAal; PSVhigh, 150% of PSVal; PSVlow, 50% of PSVal.