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. Author manuscript; available in PMC: 2013 Dec 12.
Published in final edited form as: Am J Respir Crit Care Med. 2004 Aug 18;170(11):10.1164/rccm.200404-510OC. doi: 10.1164/rccm.200404-510OC

Figure 2.

Figure 2

PAV-induced periodic breathing. Sleep state remained stable during cycling in this subject. The respiratory pattern is typical crescendo–decrescendo, indicative of a high loop gain state. Cycle length is 50 seconds. EEG = electroencephalography; Pmask = mask pressure (cm H2O); flow (L/second); Vt = tidal volume (L); time (seconds).