Fig. 8
Volume variations of the ribcage (VRC) and total chest wall (VCW) in an OI type III patient during one minute of spontaneous quite breathing (QB) followed by five minutes of noninvasive ventilation and again one minute of spontaneous breathing after switching off the ventilator (top two tracings). The single breaths indicated by thick lines in the top tracings are shown zoomed in the bottom panels. Data recorded in supine position. Note the presence of an inspiratory paradoxical inward motion of RC during QB (A), its reduction immediately after the connection to the ventilator (B), the in-phase inspiratory expansion of RC after about 5 min of connection to the ventilator (C) and the reappearance of the paradoxical motion of RC immediately after the switching off the ventilator (D)