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Related Experiment Videos

Development of collateral circulation in a replanted rat hindlimb model.

G Kellis1, J W Shaffer, G Field

  • 1Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, OH 44106.

The Journal of Hand Surgery
|November 1, 1991
PubMed
Summary

Collateral circulation in replanted rat hindlimbs improved over time, with laser Doppler monitoring showing increased blood flow and limb survival correlating with this development.

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Area of Science:

  • Regenerative Medicine
  • Vascular Surgery
  • Microsurgery

Background:

  • Replantation of severed limbs is a complex surgical challenge.
  • Restoration of adequate blood flow is crucial for tissue survival.
  • The development of collateral circulation post-replantation is not fully understood.

Purpose of the Study:

  • To investigate the development of collateral circulation in a rat hindlimb replantation model.
  • To assess the effectiveness of hemodynamic techniques in monitoring this process.
  • To correlate collateral blood flow with limb survival rates.

Main Methods:

  • Utilized a rat hindlimb replantation model.
  • Employed hydrogen washout and laser Doppler capillary perfusion monitoring for hemodynamic assessment.

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  • Studied collateral development at 2, 4-5, and 8-9 weeks post-replantation.
  • Assessed limb survival after vascular pedicle interruption at different time points.

    • Main Results:

    • Collateral blood flow increased linearly over time, reaching 77% of preligation levels by 8-9 weeks.
    • Laser Doppler assessment showed 27% blood flow at 2 weeks, 39% at 4-5 weeks, and 77% at 8-9 weeks.
    • Laser Doppler measurements correlated more closely with limb survival than hydrogen washout.
    • Limb survival rates were 0% at 2 weeks, partial at 4-5 weeks, and complete (100%) by 8-9 weeks.

    Conclusions:

    • Collateral circulation significantly develops after limb replantation, improving over time.
    • Laser Doppler is a reliable method for monitoring collateral perfusion and predicting limb viability.
    • Early post-replantation stages (2 weeks) show high risk of necrosis, with survival improving substantially by 8-9 weeks.