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術後感染症(SSI)の原因として非分解型ケリソンロンジャー(KR)内部の残渣に注目し,「非分解型KR内部には除去できない残渣が蓄積し,SSIの原因となり得る」との仮説を立てた.本研究の目的は,非分解型KR90例と分解・内部洗浄が常時可能な分解型KR94例との感染率の差を前向きに検討することである.SSIは非分解KR群で8例(8.9%),分解KR群で1例(1.1%)に発生し,発生率は前者で有意に高かった(p<0.02).非分解型KRの内部スライド部分の溝には,通常の洗浄・滅菌では除去し得ない細菌が蓄積し,SSI発生の要因となりうる.これは,脊椎外科特有のSSI発生要因であり,すべての術者が銘記すべきである.
The conventional Kerrison rongeur (KR) is a unit-type rongeur that can not be dismantled to wash out debris following surgery. We hypothesized that the debris is a source of surgical site infection (SSI). The purpose of this study was to test the hypothesis by comparing the rate of SSI in a group of patient treated with the unit-type KR (unit-type group) and a group treated with an assembly-type KR, which can be dismantled for washing and sterilization (assembly-type group). The SSI rate in the unit-type group was 8.9%, and significantly higher than the 1.1% rate in the assembly-type group (p<0.02). We therefore concluded that the debris accumulated inside uni-type KRs is a source of SSIs.
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