Investigation of internal pipeline contamination and influencing factors in the anesthesia machine
Objective To investigate the contamination of anesthesia machine pipeline in a hospital and discuss the methods to remove contamination.Methods Field sampling and quantitative bacterial detection method were used to investigate bacterial contamination and assess the disinfection effect of the anesthesia pipeline in the operating room of a hospital.Results A total of 13 internal pipeline expiration ports and the inner port of the living valve was examined, and the excess rate of bacterial contamination was 31.03％ and 57.69％, respectively. The anesthesia machine tubing was disinfected by hydrogen oxide vaporization fumigation, and the outer opening of the tubing was wiped and disinfected with chlorine containing disinfectant solution containing 1 000 mg/L available chlorine. The hygiene qualification rates of the exhalation and valve openings of the anesthesia machine tubing afer disinfection were higher than that before disinfection (P<0.05). Age, laparoscopic surgery, and prone ventilation are all risk factors for contaminating the breathing circuits inside the anesthesia machine. Conclusion The bacterial contamination of the investigated anesthesia machine internal pipeline is serious, and the fumigation and cleaning disinfection can effectively reduce the bacterial contamination.
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