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Dermofluorometry: thresholds for predicting flap survival.

J G Thomson1, C L Kerrigan

  • 1Division of Plastic Surgery, Royal Victoria Hospital, Montreal, Quebec, Canada.

Plastic and Reconstructive Surgery
|May 1, 1989
PubMed
Summary
This summary is machine-generated.

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The dye fluorescence index (DFI) accurately predicts skin flap survival in pigs. New thresholds of 7% at 2 hours and 27% at 5 hours improve prediction accuracy for flap viability.

Area of Science:

  • Biomedical Engineering
  • Surgical Research
  • Dermatology

Background:

  • The dye fluorescence index (DFI) is a recognized method for assessing skin flap survival.
  • Existing DFI thresholds for predicting flap survival and necrosis vary, leading to uncertainty.

Purpose of the Study:

  • To establish optimal DFI thresholds for predicting skin flap survival in pigs.
  • To compare the accuracy of dermofluorometry with radioactive microsphere measurements of flap blood flow.

Main Methods:

  • Dermofluorometry was used to measure DFI in pigs following flap elevation.
  • DFI measurements were taken at 2 and 5 hours post-flap elevation.
  • Flap blood flow was quantified using radioactive microspheres for comparison.

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Main Results:

  • Dermofluorometry demonstrated 90% accuracy and repeatability in predicting flap survival.
  • Optimal DFI thresholds were identified as 7% at 2 hours and 27% at 5 hours post-elevation.
  • These thresholds showed a strong correlation with flap survival at 24 hours and with blood flow index.

Conclusions:

  • Dermofluorometry is a reliable tool for monitoring acute skin and fasciocutaneous flaps in pigs.
  • The dynamic nature of flap circulation necessitates time-dependent DFI thresholds for accurate prediction.
  • DFI provides a quantitative estimate of flap blood flow, enhancing its utility as a monitoring tool.