Abstract:Objective To study the incidence of adverse events in painless digestive endoscopy in the elderly and analysis of related factors.Methods The clinical data of 284 patients who underwent painless digestive endoscopy from June 2019 to June 2021 were collected, the incidence of adverse events was recorded. The Cox risk regression model was used to analyze the risk related factors of adverse events, and the index equation was established as the prediction model, the value of prediction model in judging adverse events was analyzed.Results Among the 284 patients, 74 had adverse events, the incidence was 26.06%, which were as the observation group, there were 32 cases of heart rate fluctuation, 28 cases of blood pressure fluctuation, 9 cases of arrhythmia, 4 cases of bleeding and 1 case of intestinal perforation, 210 cases were as the control group. The age, body mass index, chronic obstructive pulmonary diseases (COPD), diabetes and snoring history, lesion characteristics and frontal and facial abnormalities were significantly different between the two groups (P < 0.05). Cox risk regression model analysis showed that age (HR^ = 1.763, 95% CI: 1.108~2.805, β = 0.567, P = 0.017), BMI (HR^ = 2.608, 95%CI: 1.916~3.550, β = 0.959, P = 0.000), COPD (HR^ = 1.702, 95%CI: 1.125~2.575, β = 0.532, P = 0.012) and snoring history (HR^ = 2.258, 95%CI: 1.403~3.634, β = 0.814, P = 0.001) were high risk factor for adverse events in painless digestive endoscopy in the elderly, the diabetes, lesion and frontal and facial abnormalities were not associated with adverse events in painless digestive endoscopy in elderly patients (P > 0.05). The exponential equation was established according to the analysis results of Cox risk regression model: Y = 0.567X1 + 0.959X2 + 0.532X4 + 0.814X5 (X1 = age, X2 = BMI, X4 = COPD, X5 = history of snoring). The receiver operating characteristic (ROC) curve analysis showed that the exponential equation had high accuracy in judging adverse events (AUC = 0.781, SE = 0.029, 95%CI: 0.724~0.837), the sensitivity was 0.824 and the specificity was 0.514.Conclusion The incidence of pulmonary adverse events in elderly patients undergoing painless digestive endoscopy is high,its occurrence is related to the patient's age, body mass index, COPD and snoring history. Therefore, the establishment of index equation has high sensitivity to judge adverse events.