Br J Anaesth:高频(30-200 Hz)丘脑皮层脑电节律减弱与麻醉作用相关:来自右美托咪定的证据

2017-12-16 田磊 "罂粟花"微信号

γ(30-80Hz)和高频γ(80-200Hz)丘脑皮层脑电节律参与意识过程并可被异氟烷和异丙酚减弱。为探讨这种衰减与麻醉作用相关的假说,我们在这个节律揭示右旋美托咪啶(选择性肾上腺素能α2激动剂,具有较小的催眠效力的作用。

背景:γ(30-80Hz)和高频γ(80-200Hz)丘脑皮层脑电节律参与意识过程并可被异氟烷和异丙酚减弱。为探讨这种衰减与麻醉作用相关的假说,我们在这个节律揭示右旋美托咪啶(选择性肾上腺素能α2激动剂)具有较小的催眠效力的作用。

方  法:我们记录了桶状皮层和丘脑腹后内侧核的局部场电位。测量10只载有装置的大鼠测量光谱功率,30-50Hz,51-75Hz,76-125Hz,126-200Hz频段。基础值、右美托咪定4种血浆浓度采用静脉靶控输注(1.86, 3.75, 5.63 和 7.50 ng ml -1)、恢复期。同样在0.3-200Hz测量丘脑连贯性。

结  果:5.63 ng ml -1时正向反射丧失(LORR)。右美托咪定在所有频段均引起皮质(P<0.04)和丘脑(P≤0.0051)对数功率线性的浓度依赖性的衰减。皮质和丘脑的斜率相似。在76-200赫兹下,右美托咪定丘脑脑电电位斜率不到其他药物的一半(P <0.003)。LORR与δ频段(0.3-4.0Hz)丘脑连贯性的增加相关(P<0.001)。异丙酚和异氟醚也增加了低频相干性。

结  论:右美托咪定可使高频丘脑的节律衰减,但较异氟醚和异丙酚的程度轻。右美托咪定和其他麻醉药物对丘脑节律的主要差异,进一步支持丘脑功能受损和麻醉之间的联系。δ相干性的增加可能反映了丘脑皮层网络循环超极化并可能是意识消失的标志。

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    2018-05-12 AspirantSuo
  2. [GetPortalCommentsPageByObjectIdResponse(id=1633432, encodeId=25521633432b0, content=<a href='/topic/show?id=377824e1c0' target=_blank style='color:#2F92EE;'>#ANA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2471, encryptionId=377824e1c0, topicName=ANA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=434d22047430, createdName=AspirantSuo, createdTime=Sat May 12 02:20:00 CST 2018, time=2018-05-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2050985, encodeId=8f7d2050985f0, content=<a href='/topic/show?id=95f8e042dd' target=_blank style='color:#2F92EE;'>#EST#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=18, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7042, encryptionId=95f8e042dd, topicName=EST)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e9a6357, createdName=xiangyuzhou971, createdTime=Thu Mar 29 16:20:00 CST 2018, time=2018-03-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1558297, encodeId=e59e155829ecb, content=<a href='/topic/show?id=c8a7208e8a8' target=_blank style='color:#2F92EE;'>#丘脑#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=18, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=20878, encryptionId=c8a7208e8a8, topicName=丘脑)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=fb8814960000, createdName=xlwang2696, createdTime=Mon Dec 18 00:20:00 CST 2017, time=2017-12-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1564306, encodeId=8368156430622, content=<a href='/topic/show?id=c8a7208e8a8' target=_blank style='color:#2F92EE;'>#丘脑#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=20878, encryptionId=c8a7208e8a8, topicName=丘脑)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=fb8814960000, createdName=xlwang2696, createdTime=Mon Dec 18 00:20:00 CST 2017, time=2017-12-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=269821, encodeId=d5642698213c, content=宝贝很好还好还好哈, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b0171930782, createdName=为你把脉, createdTime=Sat Dec 16 09:36:03 CST 2017, time=2017-12-16, status=1, ipAttribution=)]
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    2017-12-18 xlwang2696
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    2017-12-18 xlwang2696
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    2017-12-16 为你把脉

    宝贝很好还好还好哈

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