Abstract:
:Transient U wave inversion can be caused either by regional myocardial ischemia or by an elevation of systemic blood pressure. The characteristics of U wave inversion during chest pain attacks in 21 patients with variant angina were compared with those observed in 38 patients with hypertension without apparent ischemic heart disease. Differentiation was possible according to the ECG phase in which U wave inversion appeared. U wave inversion was considered to be significant if there was a discrete negative deflection of more than 0.05 mV within the TP segment. U wave inversion proceeded to positive deflection of U wave in patients with hypertension without ischemic heart disease (initial U wave inversion). In contrast, inverted U wave occurred after positive U wave deflection during attacks in patients with variant angina (terminal U wave inversion). When cold pressor test was performed in patients with variant angina during treatment with calcium entry blockers, no patient had either anginal attacks or ischemic ST-segment deviation, but 9 of 21 patients (43%) had transient initial U wave inversion, which was followed by positive U wave deflection. U wave inversion can be classified as initial U wave inversion and terminal U wave inversion according to the phasic relationship to positive U wave deflection; the latter is observed in association with regional myocardial ischemia. The former seems to be related to elevated blood pressure rather than to myocardial ischemia.
journal_name
Am Heart Jjournal_title
American heart journalauthors
Miwa K,Miyagi Y,Fujita M,Fujiki A,Sasayama Sdoi
10.1016/0002-8703(93)90104-hsubject
Has Abstractpub_date
1993-04-01 00:00:00pages
981-6issue
4eissn
0002-8703issn
1097-6744pii
0002-8703(93)90104-Hjournal_volume
125pub_type
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pub_type: 临床试验,杂志文章,随机对照试验
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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,随机对照试验
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pub_type: 临床试验,杂志文章
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pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:1998-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:1998-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-08-01 00:00:00
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pub_type: 杂志文章
doi:10.1067/mhj.2001.116070
更新日期:2001-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:2011-06-01 00:00:00
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pub_type: 杂志文章
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pub_type: 临床试验,杂志文章,多中心研究
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