JP6828918B1 - 心停止後の自己心拍再開後の生存率改善剤 - Google Patents
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Abstract
Description
(生存率改善剤の作製)
<飲水試験>
8〜10週令の雄の野生型マウス(C57BL/6J、日本チャールズリバー社製)48匹を、水道水飲水群(24匹)及び生存率改善剤飲水群(24匹)の2群に無作為に割りつけた。水道水飲水群を入れたケージ及び生存率改善剤飲水群を入れたケージに、それぞれ、水道水を入れた飲水ボトル及び生存率改善剤を入れた飲水ボトルを設置し、各群のマウスに十分な餌を与えて1週間飼育した。なお、飲水ボトルが空にならないよう、適宜補充した。
飲水ボトルをケージに設置してから4週間経過後、各群のマウスに対し、100%酸素下5%イソフルランによる全身麻酔下で気管挿管し、人工呼吸器を装着した。このとき、換気設定は換気量1回あたり250μLとし、呼吸回数は130回とした。人工呼吸器装着後は、1.3%の吸入イソフルラン濃度で麻酔を維持した。
マウスの尻尾をピンセットで把持し、体動がないことを確認した。マウスに食道体温計(Physitemp社製、IT21)を経口的に留置した。また、マウスの観血的動脈圧を左大腿動脈から測定し、薬物投与経路として左大腿静脈に静脈路を確保するため、マウスに動静脈カテーテルを留置した。次いで、マウスに塩化カリウム0.08mg/g体重を経静脈投与することにより、マウスを心停止させ、人工呼吸器を停止した。なお、マウスの心電図は、経皮ニードルプローブ(ADinstruments社製、MLA1213)を用いることによりモニターした。
手術終了後、30℃に保温したケージ内でマウスを経過観察し、手術終了から2時間経過後に、室温下のケージ内で飼育した。心停止から10日間にわたって、両群のマウスを観察し、生存率を評価した。結果を図2に示す。なお、10日目の生存率を評価した後、速やかに、マウスにペントバルビタールナトリウム150mg/kg体重を腹腔内投与し、マウスを安楽死させた。
8〜10週令の雄の野生型マウス(C57BL/6J、日本チャールズリバー社製)23匹を、水道水飲水群(12匹)及び水素水飲水群(12匹)の2群に無作為に割りつけた。水道水飲水群を入れたケージ及び水素水飲水群を入れたケージに、それぞれ、水道水を入れた飲水ボトル及び市販の水素生成器(株式会社トラストレックス社製、トラサーノ)で作製した水素水を入れた飲水ボトルを設置し、各群のマウスに十分な餌を与えて1週間飼育した。なお、飲水ボトルが空にならないよう、適宜補充した。
Claims (7)
- 水系媒体と、該水系媒体中に分散された水素含有ナノバブルとから構成され、心停止前から摂取する、心停止後の自己心拍再開後の生存率改善剤であって、
前記水素含有ナノバブルは、粒度分布曲線の最大ピークを10〜500nmの範囲内に有している、生存率改善剤。 - 少なくとも1.0×10−6体積%の前記水素含有ナノバブルを含有する、請求項1に記載の生存率改善剤。
- 前記水素含有ナノバブル中の水素の含有量は、少なくとも90体積%である、請求項1又は2に記載の生存率改善剤。
- 経口及び/又は非経口で摂取されるように用いられる、請求項1〜3のいずれか一項に記載の生存率改善剤。
- 1日当たり4〜30ml/kg体重摂取されるように用いられる、請求項1〜4のいずれか一項に記載の生存率改善剤。
- 前記水素含有ナノバブルは、1日当たり4.0×10−8〜3.0×10−4ml/kg体重摂取されるように用いられる、請求項1〜5のいずれか一項に記載の生存率改善剤。
- 前記水系媒体は、水及び電解質輸液からなる群より選ばれる一種を含む、請求項1〜6のいずれか一項に記載の生存率改善剤。
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