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Journal of the Korean Society of Neonatology 2008;15(1):32-37.
Published online May 1, 2008.
The Effect of Hyperthermic Pretreatment in a Neonatal Rat Model of Hypoxic-ischemic Brain Injury.
Su Hee Kwak, Hae Ri Lim, Heng Mi Kim, Byung Ho Choe, Soon Hak Kwon, Kyung Hee Lee, Ki Won Oh, Yoon Kyung Shon
1Department of Pediatrics, College of Medicine, Kyungpook National University, Daegu, Korea. hmkim@knu.ac.kr
2Department of Pathology, College of Medicine, Kyungpook National University, Daegu, Korea.
3Department of Pediatrics, College of Medicine, Pochon CHA University, Gumi, Korea.
4Department of Pediatrics, College of Medicine, Ulsan University Hospital, Ulsan, Korea.
열 전처지가 신생쥐의 허혈성 저산소성 뇌손상에 미치는 영향
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Abstract
PURPOSE
Perinatal asphyxia is an important cause of neonatal mortality and subsequent lifelong neurodevelopmental handicaps. Although many treatment strategies have been tested, there is currently no clinically effective treatment to prevent or reduce the harmful effects of hypoxia and ischemia in humans. In the clinical setting, maternal hyperthermia induces adverse effects on the neonatal brain, but recent studies have shown that hyperthermic pretreatment (PT) plays some role in hypoxic-ischemic (HI) injuries of the developing brain. The present study investigated the effect of hyperthermic PT on HI brain injuries in newborn rats.
METHODS
HI was produced in 7-day-old neonatal rats by unilateral common carotid artery ligation, followed by hypoxia with 8% oxygen at 38degrees C for 2 hours. Twenty-four hours before HI, one-half of the pups were exposed to a 40degrees C environment for 2 hours. The severity of the brain injury was assessed 7 days after the HI.
RESULTS
Hyperthermic PT reduced the gross and histopathologic findings of brain injury from 64.7 to 31.2% (P<0.05). There were no differences in location and severity of injury between the pretreated and control brains.
CONCLUSION
These findings indicate that hyperthermic PT provides neuroprotective benefits on HI in the developing brain. Also, these findings suggest maternal hyperthermia may have protective effect on perinatal HI brain injuries.
Key Words: Hypoxia, Ischemia, Brain, Hyperthermic pretreatment, Newborn


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