Analysis Of The Comparisons Between Air Quality And Infection Rate Of Abdominal Operative Incisions In Two Kinds Of Operating Rooms

Background and Objective:To investigate the relation between air cleanliness in the Operating Room and infection rate of abdominal operative incision by comparing air bacteriology in two kinds of Operating Room.Methods:We chose 4927 abdominal surgeries performed in common Operating Room as group A and 5038 cases in laminar flow Operating Room as group B. All the surgeries went for 2 to 3 hours. There were 6 to 9 people in the Operating Room during the surgeries. The methods for sterilization of instruments and anesthesia were almost the same and the facilities and environment were the same in Operating Rooms of both groups. In group A, uviol lamps were used for air sterilization and in group B, air sterilization was performed with clean Operating Room air-purifying conditioner system. Plate exposure sendimentation method was used to monitor the colony count in the air. All the Operating Rooms in two groups were qualified according to national hygiene standard (GB15982-1995). The colony count in laminar flow clean Operating Room was less than 10cfu/m3 and in commonOperating Room, the number was less than 200cfu/m3. And also, the infection rate of operative incision in both groups were observed and evaluated according to Diagnosis Standard of Hospital Infection published by Ministry of Public Health.Results:There were 65 cases that got incision infection in group A and the infection rate was 1.32%. There were 37 cases in incision infection and the infection rate was 0.73%. There is statistic significance in comparision of the two groups (P<0.05). The infection rate of class I, II, and III surgeries were 0.72%, 1.55% and 4.90% separately in common Operating Room, in laminar flow Operating Room the numbers were 0.25%, 0.76% and 4.09% and there was significant statistic variation (P<0.05). The infection rate of selective surgeries in common Operating Room was 1.03% and 0.72% in laminar flow Operating Room without significant statistic variation (P>0.05). The infection rate of emergency surgeries in common Operating Roomwas 1.83% and 0.76% in laminar flow Operating Room with significant statistic variation (P<0.05). The infection rate of less-than-2-hour abdominal surgeries in common Operating Roomwas 0.92% and 0.68% in laminar flowOperating Roomwithout significant statistic variation (P>0.05). The infection rate of 2-to-4-hour abdominal surgeries in common Operating Room was 1.32% and 0.74% in laminar flow Operating Room with significant statistic variation (P<0.05). The infection rate of over-4-hour abdominal surgeries in commonOperating Roomwas 1.75% and 0.77% in laminar flow Operating Room with significant statistic variation (P<0.05). In group A, the count of bacteria gradually grow up with time, while in group B, the bacteria count increased fluctuantly in the beginning of the surgery T1 and went down significantly after T3 with significant statistic variation (P<0.05).Conclusion:Air cleanliness in the Operating Roomis closely related with infection rate of abdominal operative incision. Air-purifying conditioner system could significantly decrease the incision infection rate of class I and II surgeries and reduce the incision infection rate of emergency surgeries and abdominal surgeries that last over 2 hours.