Fig. 2From: A report of three cancer patients on opioid analgesia receiving spinal anesthesia: abrupt pain elimination without respiratory depressiona Preoperative chest x-ray of the patient showing lung metastatic tumor compressing the trachea forming atelectasis of the left upper lobe. b Compressed figure of capnography monitored during the surgery. Left and right axes show end-tidal CO2 and respiratory rate, respectivelyBack to article page