Fig 3.

Mean intratidal gas distribution (ITV) curve of all the patients at each PEEP step. Data are shown as mean (sd). ITV curve represents the mean percentile contribution (%) of ventilation distribution in non-dependent and dependent lung regions during the entire inspiration. At PEEP 12 and 10 cm H₂O, intratidal gas distribution curves stayed close to each other, showing equal distribution to both regions. Dashed lines represents the interpolation lines; open circles=non-dependent region; solid circles=dependent region.