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Related Experiment Videos

Gentamicin penetration into normal rabbit nucleus pulposus

B L Currier1, K Banovac, F J Eismont

  • 1Department of Orthopedics, Mayo Clinic, Rochester, Minnesota.

Spine
|December 1, 1994
PubMed
Summary

Gentamicin concentration in rabbit nucleus pulposus peaks two hours after intravenous injection. This finding is crucial for optimizing prophylactic antibiotic timing in spinal surgery to prevent disc space infections.

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Spinal Surgery and Infection Prevention
  • Antibiotic Penetration Studies

Background:

  • Disc space infection is a significant complication following spinal surgery.
  • Prophylactic antibiotics, including gentamicin, are used to prevent these infections.
  • Limited data exist on gentamicin's pharmacokinetic penetration into the nucleus pulposus.

Purpose of the Study:

  • To investigate the pharmacokinetics of gentamicin penetration into normal rabbit nucleus pulposus.
  • To determine the concentration and time course of gentamicin in the intervertebral disc.
  • To provide data for optimizing prophylactic antibiotic administration strategies.

Main Methods:

  • Radioactively labeled gentamicin (iodine-125) was administered intravenously to 24 rabbits.

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  • Nucleus pulposus, blood, and liver specimens were collected at hourly intervals (1-6 hours post-injection).
  • Radioactivity was measured to quantify gentamicin concentration in various tissues.

    • Main Results:

    • Gentamicin concentration in the nucleus pulposus peaked at 2 hours post-injection.
    • The peak concentration was maintained throughout the 6-hour experimental period.
    • Approximately 20% of the recovered gentamicin in the nucleus pulposus was found to be tissue-bound.

    Conclusions:

    • Gentamicin concentration in the rabbit nucleus pulposus reaches its peak 2 hours after intravenous administration.
    • These findings suggest potential implications for the timing of gentamicin administration for prophylaxis in humans.
    • Further research is warranted to confirm these pharmacokinetic properties in human subjects.