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contentuptodate· Content· item f12_25_12701

©2013 UpToDate ® Print Email CO 2 waveform in obstructive lung disease The top waveform is from a patient with normal lung function and has a characteristic rectangular appearance. The bottom waveform is from a patient with severe chronic obstructive pulmonary disease and has a characteristic curved appearance and up-sloping of the alveolar plateau. FEV 1 : forced expiratory volume in one second; FVC: forced vital capacity. Reproduced with permission from: Krauss B, Deykin A, Lam A, et al. Capnogram shape in obstructive lung disease. Anesth Analg 2005; 100:884. Copyright © 2005 Lippincott Williams & Wilkins.