• Anesthesiology · Apr 2016

    Microbiological Contamination of Drugs during Their Administration for Anesthesia in the Operating Room.

    • Derryn A Gargiulo, Simon J Mitchell, Janie Sheridan, Timothy G Short, Simon Swift, Jane Torrie, Craig S Webster, and Alan F Merry.
    • From the Department of Anaesthesiology (D.A.G., S.J.M., T.G.S., J.T., C.S.W., A.F.M.), School of Pharmacy (J.S.), Department of Molecular Medicine and Pathology (S.S.), Centre for Medical and Health Sciences Education (C.S.W.), University of Auckland, Grafton, Auckland, New Zealand; and Department of Anaesthesia and Perioperative Medicine (S.J.M., T.G.S., J.T., A.F.M.), Auckland City Hospital, Grafton, Auckland, New Zealand.
    • Anesthesiology. 2016 Apr 1; 124 (4): 785-94.

    BackgroundThe aseptic techniques of anesthesiologists in the preparation and administration of injected medications have not been extensively investigated, but emerging data demonstrate that inadvertent lapses in aseptic technique may be an important contributor to surgical site and other postoperative infections.MethodsA prospective, open, microbiological audit of 303 cases in which anesthesiologists were asked to inject all bolus drugs, except propofol and antibiotics, through a 0.2-µm filter was performed. The authors cultured microorganisms, if present, from the 0.2-µm filter unit and from the residual contents of the syringes used for drawing up or administering drugs. Participating anesthesiologists rated ease of use of the filters after each case.ResultsTwenty-three anesthesiologists each anesthetized up to 25 adult patients. The authors isolated microorganisms from filter units in 19 (6.3%) of 300 cases (3 cases were excluded), including Staphylococcus capitis, Staphylococcus warneri, Staphylococcus epidermidis, Staphylococcus haemolyticus, Micrococcus luteus/lylae, Corynebacterium, and Bacillus species. The authors collected used syringes at the end of each case and grew microorganisms from residual drug in 55 of these 2,318 (2.4%) syringes including all the aforementioned microorganisms and also Kocuria kristinae, Staphylococcus aureus, and Staphylococcus hominus. Participants' average rating of ease of use of the filter units was 3.5 out of 10 (0 being very easy and 10 being very difficult).ConclusionsMicroorganisms with the potential to cause infection are being injected (presumably inadvertently) into some patients during the administration of intravenous drugs by bolus during anesthesia. The relevance of this finding to postoperative infections warrants further investigation.

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