Randomized controlled study of the safety and efficacy of nitrous oxide-sedated endoscopic ultrasound-guided fine needle aspiration for digestive tract diseases

Figure 1 Nitrous oxide sedation system (AII 5000C; Shenzhen Security Technology Co. , Ltd., China).

Figure 2 Patients were placed in the left lateral recumbent position during the endoscopic procedure and endoscopic ultrasonography-guided fine needle aspiration was performed using a linear array echo-endoscope. A: Patients were placed in the left lateral recumbent position during the endoscopic procedure and endoscopic ultrasonography-guided fine needle aspiration was performed using a linear array echo-endoscope; B: A 22G needle was used to puncture the pancreatic lesion; C: The lesion was in the body of the pancreas; D: The diagnosis of histology was adenocarcinoma.