Effect of inflatable insulation system on laminar flow and total bacterial count in air of operating room
WANG Jingyu1, FU Cong1, WANG Guangfen2, LI Qingcao3, FANG Ping1
1.Anesthesia Surgery Center, Ningbo Medical Center Lihuili Hospital, Ningbo 315000, China; 2.Department of Intensive Medicine, Ningbo Medical Center Lihuili Hospital, Ningbo 315000, China; 3.Department of Clinical Laboratory, Ningbo Medical Center Lihuili Hospital, Ningbo 315000, China
WANG Jingyu,FU Cong,WANG Guangfen, et al. Effect of inflatable insulation system on laminar flow and total bacterial count in air of operating room[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2021, 51(8): 666-669,673.
Abstract：Objective: To investigate the effect of inflatable insulation system on laminar wind speed, wind direction and total bacterial count in the air of the operating room. Methods: From March 2020 to December 2020, 76 simulated patients who were operated in vertical laminar flow operating room were selected as subjects and randomly divided as insulation laminar flow group and laminar flow group, with 38 cases in each. In the thermal insulation laminar flow group, inflatable thermal insulation blanket was used as a measure to simulate the patient’s thermal insulation during the whole perioperative period. Three dimensional ultrasonic anemometer was used to measure the wind speed and direction of laminar flow in the two groups at 64 points around the operating bed half an hour after laminar flow opening and after air sampling. Air samples were taken before the operation,30 min, 60 min, 90 min and 120 min after the operation, with an analysis of the changes in total bacterial count in the air of laminar flow of the two groups. Results: The wind direction of laminar flow was downward at different time points of the two groups, and there was no significant difference in the wind speed between the two groups (P>0.05) 30 min after laminar flow was opened. After air sampling, the insulation laminar flow group had lower wind speed than the laminar flow group (P<0.05). Further subgroup analysis showed no significant difference in the wind speed of the non head area between the two groups (P>0.05), but the wind speed of the head area of the insulation laminar flow group was lower than that of the laminar flow group (P<0.05). The total number of bacteria in the air of the two groups increased with the extension of operation time. There was no significant difference in the total number of bacterial colonies in the air of the operating room between the two groups before operation,30 min, 60 min, 90 min and 120 min after operation (P>0.05). Conclusion: Set at 38 ℃, the inflatable insulation system has no obvious influence on the wind direction of laminar flow or the total number of bacteria in the air,although it affects the laminar wind speed in the operating room to a certain degree.
