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Continuous recording from subject P7 illustrating the measurements before pneumoperitoneum. See text for explanation. Esophageal pressure (Pes) was not measured in periods of esophageal contraction (EC) like those after the negative pressure evacuations (Evac). (The small expiratory flow at Evac is not apparent at this scale.) Pao, airway pressure; PEEP, positive end-expiratory pressure; Ambu, Ambu bag.
