Journal article
Effect of local anesthetic on microorganisms in a murine model of surgical site infection
The journal of trauma and acute care surgery, Vol.73(2), pp.441-446
08/2012
DOI: 10.1097/TA.0b013e3182583e4f
PMID: 22846953
Abstract
Surgical site infections are common, with an incidence of 1.5% to 5% for all types of surgery. In vitro studies suggest an antimicrobial effect of local anesthetic. We hypothesized that subcutaneous infiltration of local anesthetic before surgical incision would reduce the incidence of postoperative wound infection.
In a wound infection model using 4- to 6-week-old female mice, Staphylococcus aureus and Escherichia coli were inoculated in surgical wounds infiltrated with local anesthetic or saline. On day 5, the mice were killed and tissues were evaluated for viable bacterial numbers, presence of bacteria histologically, and degree of inflammation on a scale of 0 to 3 based on number and types of inflammatory cells and presence of necrosis.
A one-way between-subjects analysis of variance with Tukey honestly significant difference post hoc comparisons showed no statistically significant difference in the degree of inflammation in mice infiltrated with lidocaine, lidocaine mixed with bupivacaine, or saline (p = 0.994, p = 0.337, and p = 0.792, respectively). A Tukey honestly significant difference post hoc analysis demonstrated that the saline (p = 0.038) and lidocaine mixed with bupivacaine (p = 0.006) had significantly lower degrees of inflammation than did the lidocaine group. A Bonferroni post hoc test demonstrated that those in the lidocaine (p = 0.003) and lidocaine mixed with bupivacaine (p = 0.008) groups had significantly higher inflammation than those in the saline group after controlling for the condition of the inocula.
Infiltrate, whether saline, lidocaine, or lidocaine mixed with Marcaine, did not result in significantly different bacterial presence or higher degree of inflammation when controlling for experimental condition of bacterial inocula. Thus, subcutaneous infiltration of local anesthetic before a surgical incision is made does not reduce the incidence of bacterial growth or influence the degree of inflammation which alters infection rates.
Details
- Title: Subtitle
- Effect of local anesthetic on microorganisms in a murine model of surgical site infection
- Creators
- Valerie G Sams - Department of Surgery, University of Tennessee Medical Center, Knoxville, Tennessee, USA. vsams@utmck.eduChristy M LawsonPatricia CoanDavid BemisKimberly NewkirkMichael KarlstadJamison NorwoodPatrick BarlowMitchell H GoldmanBrian J Daley
- Resource Type
- Journal article
- Publication Details
- The journal of trauma and acute care surgery, Vol.73(2), pp.441-446
- DOI
- 10.1097/TA.0b013e3182583e4f
- PMID
- 22846953
- ISSN
- 2163-0755
- eISSN
- 2163-0763
- Language
- English
- Date published
- 08/2012
- Academic Unit
- ICTS; Center for Social Science Innovation; Office of Consultation and Research in Medical Education; General Internal Medicine; Internal Medicine
- Record Identifier
- 9984094324602771
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