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Related Experiment Videos

Localized current field hyperthermia: effect on normal ocular tissue.

P E Liggett1, K J Pince, M Astrahan

  • 1Department of Opthalmology, University of Southern California School of Medicine, Los Angeles.

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|May 1, 1990
PubMed
Summary

Localized current field hyperthermia in rabbit eyes showed temperature-dependent effects. Temperatures up to 45°C for 45 minutes are safe, but 47°C caused diffuse retinal damage.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Thermal Medicine

Background:

  • Localized current field hyperthermia is a potential therapeutic modality.
  • Understanding thermal tolerance in ocular tissues is crucial for safety.

Purpose of the Study:

  • To investigate the effects of radiofrequency electromagnetic hyperthermia on normal rabbit eyes.
  • To determine the maximum safe temperature and duration for ocular hyperthermia.

Main Methods:

  • A 500 kHz radiofrequency system was used to heat rabbit eyes via a scleral plaque.
  • Temperatures of 43°C, 45°C, and 47°C were applied for 45 minutes.
  • Ocular effects were assessed using clinical exams, fluorescein angiography, electroretinography, and histopathology.

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Main Results:

  • Hyperthermia effects were temperature-dependent and localized at lower temperatures.
  • At 47°C, electroretinography was abolished, with diffuse photoreceptor damage observed histopathologically.
  • Histopathology and electron microscopy confirmed damage outside the treatment field at 47°C.

Conclusions:

  • Hyperthermia at 45°C for 45 minutes is the maximum tolerable temperature in normal rabbit eyes.
  • Higher temperatures (47°C) can lead to significant, diffuse retinal damage beyond the targeted area.