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Vancomycin Concentrations in Paraspinal Muscles During Posterior Spinal Fusions for Neuromuscular Scoliosis

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Spine Deformity Aims and scope Submit manuscript

Abstract

Study Design

Prospective consecutively enrolled cohort.

Objectives

To evaluate paraspinal muscle concentration of intravenously administered vancomycin, at predetermined time points, during posterior spinal fusion (PSF) with instrumentation in neuromuscular scoliosis (NMS).

Summary

Surgical site infection (SSI) after PSF for NMS can be a devastating complication, which may lead to prolonged antibiotic use, multiple additional surgical procedures, pseudarthroses, and sepsis. Because of significant morbidity of SSIs in NMS, the prophylactic use of vancomycin has been adopted at our institution as standard wound prophylaxis, despite any high-level evidence of its efficacy.

Methods

A prospective study of 20 patients who underwent definitive PSF for NMS and received vancomycin infusion preoperatively per institutional protocol. Serum levels were obtained immediately after infusion, at surgical incision, and then at 1, 2, and 4 hours post incision. Muscle tissue samples were simultaneously obtained at incision and at 1, 2, and 4 hours post incision. Samples were analyzed by a validated liquid chromatography–tandem mass spectrometry method.

Results

10 males and 10 females with a mean age of 14+11 years (9–20 years) received a mean infusion of 15.0 mg/kg vancomycin. Mean serum levels were 26.7 μg/mL after infusion, 18.1 at incision, 13.2 at 1 hour, 11.8 at 2 hours, and 7.6 at 4 hours post infusion. Mean muscle levels were 0.5 μg/mL at incision, 0.6 at 1 hour, 0.5 at 2 hours, and 0.7 at 4 hours post infusion. Mean serum levels reached minimum inhibitory concentration (MIC) for Staphylococcus aureus at incision and at all timepoints during surgery. Mean muscle vancomycin levels never reached MIC. No patients had any cardiac or kidney disease, and all patients had normal kidney function according to their preoperative laboratory values.

Conclusions

Using accepted guidelines for the administration of intravenous vancomycin preoperatively, serum levels reached MIC at incision and at all timepoints tested during PSF for neuromuscular scoliosis. At no timepoint tested did muscle levels reach MIC.

Level of Evidence

Level II.

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Authors and Affiliations

  1. University of Oklahoma Health Sciences Center, 1100 N Lindsay Ave, 73104, Oklahoma City, OK, USA

    James R. Gregory MD

  2. Washington University School of Medicine, 1 Children’s Place, 660 S Euclid Ave, St. Louis, 63110, St. Louis, MO, USA

    June C. Smith MPH, Sarah M. Brown-Riley PhD, Alexis M. Elward MD & Scott J. Luhmann MD

Authors
  1. James R. Gregory MD
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  2. June C. Smith MPH
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  3. Sarah M. Brown-Riley PhD
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  4. Alexis M. Elward MD
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  5. Scott J. Luhmann MD
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Corresponding author

Correspondence to Scott J. Luhmann MD.

Additional information

Author disclosures: JRG (none), JCS (none), SMBR (none), AME (none), SJL (none).

Washington University IRB approval was obtained.

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Gregory, J.R., Smith, J.C., Brown-Riley, S.M. et al. Vancomycin Concentrations in Paraspinal Muscles During Posterior Spinal Fusions for Neuromuscular Scoliosis. Spine Deform 6, 736–740 (2018). https://doi.org/10.1016/j.jspd.2018.04.001

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  • DOI: https://doi.org/10.1016/j.jspd.2018.04.001

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