Abstract:Objective To evaluate the anesthetic effect and safety of cyclopol combined with lidocaine in painless colonoscopy for elderly obese patients.Methods Ninety-two elderly obese patients who underwent painless colonoscopy from June 2022 to June 2023 at Hangzhou First People's Hospital Affiliated to West Lake University School of Medicine were selected. They were divided into the experimental group (cyclopol combined with lidocaine group) and the control group (cyclopol alone group) through stratified random sampling, with 46 cases in each group. The experimental group received 0.3 mg/kg of cyclopol and 2% lidocaine at a dose of 1.5 mg/kg, while the control group received only 0.3 mg/kg of cyclopol. The two groups were compared in terms of anesthetic effects (duration of colonoscopy procedure, duration of anesthesia induction, time to recovery, and time to orientation recovery), changes in heart rate (HR), mean arterial pressure (MAP), and pulse oxygen saturation (SpO2) 5 minutes before anesthesia (T0), after anesthesia induction (T1), immediately after colonoscopy insertion (T2), at the end of the operation (T3), and before leaving the recovery room (T4), postoperative Ramsay sedation scores, VAS scores, Observer Assessment of Alertness/Sedation Scale (OAA/S) scores, endoscopist and patient satisfaction scores, discharge scores (modified Aldrete scores), and the occurrence of adverse reactions (nausea and vomiting, body movement, hypotension, intestinal spasm, respiratory depression, choking and hiccup).Results There was no significant difference between the two groups in the duration of colonoscopy procedure and that of anesthesia induction (P > 0.05). The experimental group had shorter times to recovery and orientation recovery compared with the control group (P < 0.05). Comparison of HR, MAP and SpO2 at T0, T1, T2, T3 and T4 demonstrated that they were different among the time points (F = 18.630, 27.143 and 13.491, all P < 0.05) but not between the groups (F = 0.556, 1.725 and 0.862, all P > 0.05), and that the change trends of these indicators were not different between the groups (F = 0.546, 0.713 and 0.441, all P > 0.05). There was no significant difference between the two groups in Ramsay sedation scores, OAA/S scores, and discharge scores (P > 0.05). However, the experimental group had a lower VAS score and higher satisfaction scores from endoscopists and patients compared with the control group (P < 0.05). The incidence of body movement, hypotension, respiratory depression, choking and hiccup in the experimental group was lower than in the control group (P < 0.05). No difference was observed in the incidence of nausea and vomiting or intestinal spasm between the two groups (P >0.05)Conclusions Cyclopol combined with lidocaine in elderly obese patients undergoing painless colonoscopy, compared with cyclopol anesthesia alone, can not only significantly improve anesthetic effects and shorten the time to recovery but also increase both patient and physician satisfaction while reducing the incidence of adverse reactions, making it a safer and more effective anesthesia option.