case_images: PMC6329232_01
case_images: The patient's electrocardiogram, capnogram, and plethysmogram (pulse oximetry) from (a) about 10 min before administration of ephedrine and (b) about 20 min after administration of ephedrine
case_images: SJA-13-63-g001.jpg
case_images: PMC6329232_01_SJA-13-63-g001.jpg
case_images: F1
case_images: His capnogram showed an airway obstructive pattern immediately after the initiation of mechanical ventilation [Figure 1a]. His airway pressure during pneumoperitoneum was approximately 24-26 cm H2O. Furthermore, his obstructive capnogram reverted to normal about 20 min after ephedrine [Figure 1b].
case_images: The patient's flow-volume curve from the preoperative pulmonary function test shows a low peak expiratory flow (a) and relatively sharp fall (b) in the flow-volume loop. The straight lines indicate the predicted flow-volume curve for this patient
case_images: SJA-13-63-g002.jpg
case_images: PMC6329232_01_SJA-13-63-g002.jpg
case_images: F2
case_images: After this diagnosis, we carefully rechecked his preoperative PFT results and found a low peak expiratory flow and sharp fall in the flow-volume loop [Figure 2].