Effects of canine myocardial infarction on sympathetic efferent neuronal function: scintigraphic and electrophysiologic correlates.

Effects of canine myocardial infarction on sympathetic efferent neuronal function: scintigraphic and electrophysiologic correlates.
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犬心肌梗塞对交感传出神经元功能的影响:闪烁扫描和电生理相关性。

DOI:
10.1016/0002-8703(93)90661-r
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发表时间:
1993
影响因子:
4.8
通讯作者:
Dae,M
Dae,M
中科院分区:
医学2区
文献类型:
--
作者:
Newman,D;Munoz,L;Chin,M;Franz,M;Herre,J;Scheinman,MM;Botvinick,E;Dae,M

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我们研究了非分散性左星状神经节刺激对10只存活犬慢性心肌梗死模型104个部位的局部心外膜单相动作电位50%复极时程(APD 50)和90%复极时程(APD 90)的影响。这些影响与铊-201和碘-123甲硫代苄胍(MIBG)成像,以确定可行的,但去神经支配的心肌区。平均梗死面积为心脏总重量的5.2% ± 0.8%,去神经支配的平面测量面积总是较大(心脏总面积的18% ± 4%)。在恒定心室起搏过程中,星状刺激仅在正常神经支配区域倾向于缩短APD 90(364 ± 5至358 ± 5 msec),在去神经支配区域倾向于增加APD 90(358 ± 5至362 ± 5 msec),(对于星状前和星状后刺激,p值不显著(NS);去神经支配与神经支配之间的差异p< 0.05)。神经支配区的APD_(50)从287 ± 5缩短到270 ± 3 msec(p< 0.05),而失神经支配区的APD_(50)从283 ± 4缩短到274 ± 5 msec(p= NS)。我们的结论是,MIBG成像证明去神经识别受损的缩短的心外膜APD 50的区域,在响应星状刺激和非透壁心肌梗死产生的面积比坏死面积去神经支配。
We studied the effects of nondecentralized left stellate ganglion stimulation on regional epicardial monophasic action potential duration at 50% (APD50) and 90% (APD90) repolarization from 104 sites in 10 surviving dogs with a chronic myocardial infarction model. These effects were correlated with thallium-201 and iodine-123 metiodobenzylguanidine (MIBG) imaging to identify areas of viable but denervated myocardium. Mean infarct size was 5.2% ± 0.8% total heart weight, and the planimetered areas of denervation were always larger (18% ± 4% total heart area). During constant ventricular pacing, stellate stimulation tended to shorten the APD90only in normally innervated areas (364 ± 5 to 358 ± 5 msec) and to increase in denervated areas (358 ± 5 to 362 ± 5 msec), (pvalue not significant (NS) for prestellate and poststellate stimulation;p< 0.05 for difference between denervated vs innervated). The APD50significantly shortened in innervated areas from 287 ± 5 to 270 ± 3 msec (p< 0.05) compared with denervated areas (283 ± 4 to 274 ± 5 msec,p= NS). We conclude that MIBG imaging demonstration of denervation identifies areas with impaired shortening of the epicardial APD50in response to stellate stimulation and that nontransmural myocardial infarction produces areas of denervation larger than areas of necrosis.
体内完整心脏中肾上腺素和搏动间隔对心室复极的相互作用。
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DOI: 10.1152/ajpheart.1989.257.5.h1523
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影响因子: --
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