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In Vivo Magnetic Resonance Thermometry for Brain and Body Temperature Variations in Canines under General Anesthesia
Keonil Kim1,2, Jisoo Ahn3, Kwangyong Yoon3
1Bio-Chemical Analysis Team, Center for Research Equipment, Korea Basic Science Institute, Cheongju 28119, Korea.
Sensors (Basel, Switzerland)
|June 10, 2022
Summary
General anesthesia lowers core body temperature. This study found brain temperatures, particularly white matter, dropped significantly more than rectal temperatures during anesthesia, highlighting the need for advanced monitoring.
Area of Science:
- Medical Imaging
- Neuroscience
- Anesthesiology
Background:
- Core body temperature often decreases during general anesthesia.
- Monitoring core body temperature is crucial for patient safety during anesthesia.
- Previous studies suggest a discrepancy between brain and core temperatures under anesthesia, but noninvasive methods are needed.
Purpose of the Study:
- To investigate brain temperature changes in patients under general anesthesia using noninvasive magnetic resonance thermometry.
- To compare brain temperature dynamics with core body (rectal) temperature.
- To analyze differences in temperature reduction between brain tissues (white vs. gray matter).
Main Methods:
- Utilized in vivo magnetic resonance thermometry (proton resonance frequency shift method) to measure brain temperatures.
- Simultaneously recorded rectal temperature using a fiber optic thermometer.
- Analyzed temperature changes in relation to body conditioning scores.
Main Results:
- Brain temperature (white matter) decreased by 4.8 ± 0.5 °C when rectal temperature dropped by 1.4 ± 0.5 °C.
- White matter experienced a greater temperature reduction than gray matter.
- Differences in temperature reduction were attributed to vascularization patterns in gray matter.
Conclusions:
- Noninvasive magnetic resonance thermometry accurately reflects significant brain temperature drops under general anesthesia.
- Brain tissue exhibits differential cooling rates, with white matter cooling more than gray matter.
- Further research into body weight's effect on temperature changes is warranted.
