Abstract: Objective To analyze related factors of patients complicated with respiratory tract infection （RTI） treated by painless gastroscopy, so as to explore measures to reduce the complication of RTI. Methods The incidence of RTI in inpatients undergoing painless gastroscopy from 2015 to 2018 in a hospital in Neijiang City was investigated, and the related factors of painless gastroscope complicated with RTI were analyzed. Results A total of 3 316 inpatients undergoing painless gastroscopy were investigated, including 1 976 males （59.6%） and 1 340 females （40.4%）.The age ranged from 23 to 74 years, with an average age of （57.63 ± 7.59） years. Of the patients, 102 were complicated with RTI, with an infection rate of 3.08% （102/3 316）.A total of 115 strains of pathogens were isolated, including 75 strains of Gram-negative bacteria （65.22%）, 28 strains of Gram-positive bacteria （24.35%）, and 12 strains of fungi （10.43%）.The resistance rates of major Gram-negative and Gram-positive bacteria to most Class A antibiotics were lower than 30%.Multivariate logistic regression analysis showed that age ≥56 years （OR=14.984）, duration for gastroscope >20 minutes （OR=14.761） and eating stimulating food within 24 hours after gastroscopy （OR=1.669） were risk factors for complication of RTI after undergoing the painless gastroscopy. Conclusion Painless gastroscopy had the risk for complication of RTI. Age, duration for gastroscopy and stimulating food after operation can increase the risk of RTI after undergoing the painless gastroscopy.

Key words: Painless gastroscopy, Respiratory tract infection, Risk factors, Drug resistance