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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Laryngoscope. 2011 Jan 13;121(2):404–408. doi: 10.1002/lary.21275

Figure 2.

Figure 2

Left (open squares) and right (closed circles) MEP as a function of time for the N2O exchange experiment on Subject 18 (a) and Subject 11 (b) showing the MEP trajectory for the 3 experimental Periods corresponding to breathing: air (0 to 20 minutes), the N2O mixture (20–50 minutes) and air (50–80 minutes). Note that, for Subject 18, the monotonic rise in MEP during Period 2 was relatively uninterrupted until approximately 45 and 50 minutes, while for Subject 11, that Period of increase was associated with repeated interruptions.