PMC6329232_01
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
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F1
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].
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
SJA-13-63-g002.jpg
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F2
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].