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. 2014 Nov 25;2:132. doi: 10.3389/fped.2014.00132

Figure 1.

Figure 1

Non-rhythmic to rhythmic (NRR) index for electrical activity of the diaphragm [EAdi (A)] and ventilatory pressure (B) signals, calculated over 10 min (blue bars) or 2 min (red bars) periods in infants without ventilatory support (control) and during mechanical ventilation in neurally adjusted ventilatory assist (NAVA), pressure support ventilation (PSV), and pressure-controlled ventilation (PCV). Note that time scale of assessing variability using NRR index has an effect on estimating EAdi variability (p = 0.03), but not on estimating the ventilator pressure variability (p = 0.44). NRR, arbitrary units. Data are presented as median [25–75%]. *p < 0.01 in pairwise comparison.