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Surgical smoke as potential biohazard: is viral DNA contained?

Shigeyoshi Higashi1, Yasuhiro Miyazaki2, Tomonori Makino2, Tsuyoshi Takahashi2, Yukinori Kurokawa2, Makoto Yamasaki2, Shuji Takiguchi2, Masaki Mori2, Yuichiro Doki2, Kiyokazu Nakajima1. 1Division of Next Generation Endoscopic Intervention (Project ENGINE) Global Center for Medical Engineering and Informatics, Osaka University, Osaka, Japan, 2Department of Gastroenterological Surgery Osaka University Graduate School of Medicine, Osaka, Japan

Introduction: It is widely known that surgical smoke (SS) generated by energy devices e.g. electrocautery (EC) and laparoscopic coagulating shears (LCS), includes harmful chemicals such as aldehydes and NOx. It has been recommended to recover SS actively from the point of view of risk management. However, details are not known whether SS contains viable tumor cells and/or infectious substances such as bacteria and virus. This study was aimed to clarify whether SS contains potentially bio-hazardous components such as tumor cells and viral particles.

Materials and Methods: [Tumor study] This was an ex-vivo animal study. Liver cell carcinoma cell line “PLC/PRF/5” were implanted subcutaneously in Nod/SCID mice (n=5). Tumors were intentionally ablated for 3 minutes to generate SS using EC or LCS. SS was bubbled in nuclease-free water (Ultra DW, GIBCO) via a semi-closed system with negative pressure of 10kPa. DNA was then extracted from the recovered fluid, and polymerase chain reaction (PCR) was carried out using specific primers to amplify the sequence within HBs gene of PLC/PRF/5 (200bp), those grossly band was confirmed by electrophoresis. [Virus study] This was IRB-approved, ex-vivo study using human samples. The surgically resected fresh liver samples with HBV infection were used (n=6). SS was generated by ablating non-tumorous component of the resected liver with EC or LCS in the bench-top setting. SS recovery process was performed in the same manner as Tumor study. Detection of HBV-DNA and HBs antigen in the bubbled fluid, was attempted using standard PCR method or CLIA/CLEIA method, respectively.

Results: [Tumor study] The bubbled samples were PCR positive in 80.0% (3/5) after EC activation, and 100.0% (5/5) after LCS activation, respectively. [Virus study] In serum HBV-DNA-positive liver samples (n=3), HBV-DNA was positive in 88.9% (8/9) after EC, and 77.8% (7/9) after LCS activation, respectively. In serum HBV-DNA negative liver samples (n=3), no HBV-DNA was detected. HBs antigen was negative in all bubbled fluids.

Conclusions: Fragmented tumor DNAs were detectable in SS generated by EC and LCS. Host-derived HBV-DNA was also detectable in SS generated by both EC and LCS. These data suggest that SS is oncologically and virologically bio-hazardous. Care should be taken not to expose SS to patients and operating room personnel.


Presented at the SAGES 2017 Annual Meeting in Houston, TX.

Abstract ID: 79401

Program Number: P433

Presentation Session: Poster (Non CME)

Presentation Type: Poster

119

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