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. 2020 Dec 30;1(4):476–494. doi: 10.34197/ats-scholar.2020-0017RE

Figure 2.

Figure 2.

A polygraph illustrating a case of consecutive central sleep apnea (CSA) events with Cheyne-Stokes respiration. Red arrows’ abbreviations: (a) crescendo phase; (b) decrescendo phase; (c) electroencephalographic arousal at peak ventilation phase. The dotted vertical line indicates the end of a CSA event. Different CSA-related timing definitions are highlighted. Apnea length = duration of apnea; Circulation time = the time between the end of CSA event and the nadir corresponding O2 saturation (SaO2); Ventilation length = duration of respiration following apnea. Adapted by permission from Reference 12.