459613.fig.001a
(a)
459613.fig.001b
(b)
459613.fig.001c
(c)
Figure 1: Polysomnographic recordings of central sleep apnoea (a), mixed sleep apnoea (b), and obstructive sleep apnoea (c). Episodes of apnoea paralleled by the absence of respiratory movements of the chest (blue line) and abdomen (yellow line) indicate a central nature of the breathing disorder. The crescendo-decrescendo breathing pattern typical of Cheyne-Stokes respiration is evident (a). Episodes of apnoea with the initial absence of the respiratory movements of the chest and abdomen, followed by their resumption (red arrow), indicate a mixed-type breathing disorder (b). Episodes of apnoea paralleled by the respiratory movements of the chest and abdomen confirm the obstructive nature of the breathing disorder (c).