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©2013 UpToDate ® Print Email COPD pressure, flow, and muscle tracings Recordings of flow, airway pressure (Paw), and transversus abdominis electromyography in a critically ill patient with COPD who is receiving pressure support of 20 cm H 2 O. The onset of expiratory muscle activity (vertical dotted line) occurred when mechanical inflation was only partially completed, indicating that the patient was "fighting the ventilator". Reproduced with permission from: Parthasarathy S, Jubran A, Tobin MJ. Am J Respir Crit Care Med 1998; 158:1471. Copyright ©1998 American Thoracic Society.