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Abstract：
BACKGROUND: Preventing surgical site infections and prosthetic joint infections is crucial for patient safety after total joint arthroplasty. Microbial air contamination has been suggested as a risk factor. Therefore, the ventilation system that will reduce air contamination most effectively in operating theatres (OTs) has been discussed.
OBJECTIVE: To determine whether laminar airflow (LAF) ventilation is superior to turbulent airflow (TAF) ventilation by looking at the colony forming units (cfu) count during live total hip and knee arthroplasties. Furthermore, to explore whether the number of OT personnel, door and cabinet lock openings and technical parameters of the ventilation systems have an impact on the number of cfu.
METHODS: Active air sampling and passive sedimented bacterial load were performed in 17 OTs, equipped with either LAF or TAF ventilation, during 51 live surgeries while observations were noted.
RESULTS: LAF OTs reduced cfu counts compared with TAF OTs during live surgery (P<0.001). All LAF OTs provided ultraclean air whereas TAF had nine procedures exceeding the threshold of 10 cfu/m3. Door and cabinet lock openings and number of personnel did not influence the cfu count, while it decreased with increasing volume and total air change per hour (P<0.05).
CONCLUSIONS: All LAF OTs had cfu counts within recommendations and provided lower cfu counts compared with TAF OTs. The number of OT personnel and total openings did not have an influence on cfu counts. Increased volume of the OT and total air change per hour showed a decrease in active cfu counts.
OBJECTIVE: To determine whether laminar airflow (LAF) ventilation is superior to turbulent airflow (TAF) ventilation by looking at the colony forming units (cfu) count during live total hip and knee arthroplasties. Furthermore, to explore whether the number of OT personnel, door and cabinet lock openings and technical parameters of the ventilation systems have an impact on the number of cfu.
METHODS: Active air sampling and passive sedimented bacterial load were performed in 17 OTs, equipped with either LAF or TAF ventilation, during 51 live surgeries while observations were noted.
RESULTS: LAF OTs reduced cfu counts compared with TAF OTs during live surgery (P<0.001). All LAF OTs provided ultraclean air whereas TAF had nine procedures exceeding the threshold of 10 cfu/m3. Door and cabinet lock openings and number of personnel did not influence the cfu count, while it decreased with increasing volume and total air change per hour (P<0.05).
CONCLUSIONS: All LAF OTs had cfu counts within recommendations and provided lower cfu counts compared with TAF OTs. The number of OT personnel and total openings did not have an influence on cfu counts. Increased volume of the OT and total air change per hour showed a decrease in active cfu counts.
摘要：
背景：预防手术部位感染和人工关节感染对于全关节置换术后患者安全至关重要。微生物空气污染已被认为是一个危险因素。因此,已讨论了在手术室（OTs）中最有效地减少空气污染的通风系统。
目的：通过观察全髋关节和膝关节置换术期间的集落形成单位（cfu）计数，确定层流气流（LAF）通气是否优于湍流气流（TAF）通气。此外，探讨OT人员的数量，门和柜锁的开口和通风系统的技术参数对cfu的数量有影响。
方法：在17个OTs中进行了主动空气采样和被动沉降细菌负荷，配备LAF或TAF通风，在51例活体手术中观察到。
结果：在活体手术期间，与TAFOTs相比，LAFOTs减少了cfu计数（P<0.001）。所有LAFOTs都提供超贫空气，而TAF有9个程序超过10cfu/m3的阈值。门和柜锁开口和人员数量不影响cfu计数，随每小时风量和总风量的增加而降低(P<0.05)。
结论：所有LAFOTs的cfu计数均在建议范围内，与TAFOTs相比，cfu计数较低。OT人员的数量和总空缺对cfu计数没有影响。OT的体积增加和每小时的总空气变化表明活性cfu计数减少。
目的：通过观察全髋关节和膝关节置换术期间的集落形成单位（cfu）计数，确定层流气流（LAF）通气是否优于湍流气流（TAF）通气。此外，探讨OT人员的数量，门和柜锁的开口和通风系统的技术参数对cfu的数量有影响。
方法：在17个OTs中进行了主动空气采样和被动沉降细菌负荷，配备LAF或TAF通风，在51例活体手术中观察到。
结果：在活体手术期间，与TAFOTs相比，LAFOTs减少了cfu计数（P<0.001）。所有LAFOTs都提供超贫空气，而TAF有9个程序超过10cfu/m3的阈值。门和柜锁开口和人员数量不影响cfu计数，随每小时风量和总风量的增加而降低(P<0.05)。
结论：所有LAFOTs的cfu计数均在建议范围内，与TAFOTs相比，cfu计数较低。OT人员的数量和总空缺对cfu计数没有影响。OT的体积增加和每小时的总空气变化表明活性cfu计数减少。
