Accuracy of Postoperative End-tidal Pco2Measurements with Mainstream and Sidestream Capnography in Non-obese Patients and in Obese Patients with and without Obstructive Sleep Apnea Anesthes. 2009;111(3):609-615. doi:10.1097/ALN.0b013e3181b060b6 Figure Legend: Fig. 1. ( A ) Cap-ONE (Nihon Kohden, Tokyo, Japan), mainstream capnometer system that includes an oral guided nasal cannula. ( B ) Smart CapnoLine Plus cannula (Oridion Capnography Inc., Needham, MA), a nasal cannula for sidestream Microcap capnometer with oral guide. ( C ) CapnoLine H cannula (Oridion Capnography Inc., Needham, MA), a conventional nasal cannula (with no oral guide) for sidestream Microcap capnometer. Date of download: 10/20/2017 Copyright © 2017 American Society of Anesthesiologists. All rights reserved.