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Related Experiment Videos

Cerebral blood flow changes during localized hyperthermia.

E Moriyama1

  • 1Department of Neurological Surgery, Okayama University Medical School, Japan.

Neurologia Medico-Chirurgica
|November 1, 1990
PubMed
Summary
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Microwave hyperthermia increases regional cerebral blood flow (rCBF) in normal monkey brains. However, exceeding specific temperature and time thresholds during treatment can cause irreversible damage to brain tissue and vasculature.

Area of Science:

  • Neuroscience
  • Oncology
  • Biomedical Engineering

Background:

  • Hyperthermia is an emerging therapy for malignant brain tumors, often combined with radiation.
  • Tissue blood flow significantly influences hyperthermia's effectiveness by affecting pH, PaO2, and nutrient supply.

Purpose of the Study:

  • To investigate regional cerebral blood flow (rCBF) changes in normal monkey brains during microwave hyperthermia.
  • To determine the relationship between temperature, exposure time, and rCBF during hyperthermia treatment.

Main Methods:

  • 15 Japanese monkeys underwent interstitial microwave hyperthermia (2450 MHz) under general anesthesia.
  • Regional cerebral blood flow (rCBF) was measured using the hydrogen clearance method.
  • Intracerebral temperatures and rCBF were monitored in white matter tissue.

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Main Results:

  • rCBF increased linearly with temperature (10% per 1°C rise) up to 42°C for 180 minutes.
  • Heating above 45°C caused a transient rCBF increase followed by a decline.
  • No consistent rCBF changes were observed at 43°C; thresholds of 43°C and 40-60 minutes were identified.

Conclusions:

  • Normal brain tissue exhibits increased rCBF during hyperthermia within safe temperature and time limits.
  • Excessive hyperthermia (above 45°C or prolonged exposure) risks irreversible damage to brain tissue and vasculature.
  • These findings are crucial for optimizing hyperthermia protocols in brain tumor treatment.