Relationship between prolonged neural suppression and cerebral hemodynamic dysfunction during hypothermia in asphyxiated piglets

( 最大 2000 件 )
URI http://shark.lib.kagawa-u.ac.jp/kuir/metadata/28557
タイトル
Relationship between prolonged neural suppression and cerebral hemodynamic dysfunction during hypothermia in asphyxiated piglets
ファイル
内容記述

Abstract
OBJECTIVES:

Hypothermia (HT) improves the outcome of neonatal hypoxic-ischemic encephalopathy. Here, we investigated changes during HT in cortical electrical activity using amplitude-integrated electroencephalography (aEEG) and in cerebral blood volume (CBV) and cerebral hemoglobin oxygen saturation using near-infrared time-resolved spectroscopy (TRS) and compared the results with those obtained during normothermia (NT) after a hypoxic-ischemic (HI) insult in a piglet model of asphyxia. We previously reported that a greater increase in CBV can indicate greater pressure-passive cerebral perfusion due to more severe brain injury and correlates with prolonged neural suppression during NT. We hypothesized that when energy metabolism is suppressed during HT, the cerebral hemodynamics of brains with severe injury would be suppressed to a greater extent, resulting in a greater decrease in CBV during HT that would correlate with prolonged neural suppression after insult.
METHODS:

Twenty-six piglets were divided into four groups: control with NT (C-NT, n = 3), control with HT (C-HT, n = 3), HI insult with NT (HI-NT, n = 10), and HI insult with HT (HI-HT, n = 10). TRS and aEEG were performed in all groups until 24 h after the insult. Piglets in the HI-HT group were maintained in a hypothermic state for 24 h after the insult.
RESULTS:

There was a positive linear correlation between changes in CBV at 1, 3, 6, and 12 h after the insult and low-amplitude aEEG (<5 µV) duration after insult in the HI-NT group, but a negative linear correlation between these two parameters at 6 and 12 h after the insult in the HI-HT group. The aEEG background score and low-amplitude EEG duration after the insult did not differ between these two groups.
DISCUSSION AND CONCLUSION:

A longer low-amplitude EEG duration after insult was associated with a greater CBV decrease during HT in the HI-HT group, suggesting that brains with more severe neural suppression could be more prone to HT-induced suppression of cerebral metabolism and circulation.

KEYWORDS:

Animal model; Cerebral blood volume; Cerebral hemoglobin oxygen saturation; Electroencephalography; Hypothermic therapy; Hypoxia-ischemia; Hypoxic-ischemic encephalopathy; Near-infrared time-resolved spectroscopy; Piglet

(医博甲698)

著者
著者 神内 済
著者(ヨミ) ジンナイ ワタル
著者(別表記) Jinnai Wataru
掲載誌
Brain and Development
掲載誌(別表記)
Brain Dev.
40
8
開始ページ
649
終了ページ
661
出版者
Japanese Society of Child Neurology
日本小児神経学会
Elsevier
出版年月日
2018-05-19
ISSN
1872-7131
NCID
AA00111153
PMID
29789202
DOI
10.1016/j.braindev.2018.04.010
資料タイプ
学位論文
言語
英語
関連情報
出版社版URL : https://doi.org/10.1016/j.braindev.2018.04.010
関連情報URL
https://doi.org/10.1016/j.braindev.2018.04.010
関連情報(isVersionOf)
Publisher's Version.
権利関係
エルゼビア・ジャパンに著作権ポリシーを確認した結果、リポジトリでの公開可能を確認した。 / As a result of confirming the copyright policy to Elsevier Japan, we confirmed the possibility of publishing in the repository.
出版社版URL : https://doi.org/10.1016/j.braindev.2018.04.010
博士論文(全文を含む)
学位授与番号
博甲第698号
学位授与年月日
2018-09-27
学位名
博士(医学)
学位授与機関
香川大学
区分
香川大学
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