Abstract:
:Clinical reports show that electrical stimulation of the spinal cord reduces symptoms of angina pectoris, but so far have not provided evidence on the mechanisms involved. The hypothesis for this study was that inhibition of spinothalamic tract transmission may account for this result. Extracellular potentials of 28 spinothalamic tract neurons were recorded in anaesthetized monkeys, and the effects of dorsal column stimulation were determined on activity evoked by cardiac and somatic stimuli. Dorsal column stimulation reduced the number of cell potentials evoked by electrical stimulation of cardiopulmonary sympathetic afferent fibres in 11 spinothalamic tract cells tested. Activity evoked by intracardiac injection of bradykinin was decreased by dorsal column stimulation in six of seven neurons that responded to chemical stimulation of afferents. Differential effects of dorsal column stimulation were correlated to the cell responses to somatic field stimulation. Dorsal column stimulation inhibited activity in 12 of 12 neurons which were excited only by noxious pinch of somatic fields, whereas eight of 16 neurons which were excited by innocuous brushing of somatic fields were unaffected or excited. Transection of the dorsal column showed that the pathway transmitting inhibitory impulses descended from the stimulation site to the spinothalamic tract neurons examined. Results of this study are consistent with the concept that spinal cord stimulation reduces pain by decreasing the firing of spinothalamic tract cells which are activated by small fibre afferents. The paresthesias associated with nerve stimulation techniques may result from activation of spinothalamic tract cells which are excited by large fibre afferents. The clinical decision to employ spinal cord stimulation in patients with angina should balance the obvious benefit of pain relief against the risk of depriving the patient of an important warning signal while active myocardial ischaemia is in progress.
journal_name
Eur Heart Jjournal_title
European heart journalauthors
Chandler MJ,Brennan TJ,Garrison DW,Kim KS,Schwartz PJ,Foreman RDdoi
10.1093/eurheartj/14.1.96subject
Has Abstractpub_date
1993-01-01 00:00:00pages
96-105issue
1eissn
0195-668Xissn
1522-9645journal_volume
14pub_type
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journal_title:European heart journal
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journal_title:European heart journal
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更新日期:1998-09-01 00:00:00
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journal_title:European heart journal
pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 杂志文章
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更新日期:1988-11-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:1998-02-01 00:00:00
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更新日期:1992-06-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/eurheartj/14.4.474
更新日期:1993-04-01 00:00:00
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更新日期:2021-01-04 00:00:00