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Quantitative analysis of QRS magnitude in patients with ischemic ST depression Setsuo Ohnishi 1 1The Third Department of Internal Medicine Toho University of Medicine pp.1123-1129
Published Date 1983/10/15
DOI https://doi.org/10.11477/mf.1404204320
  • Abstract
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The present study was analyzed to estimate the quantitative discrepancy of the Frank lead QRS vectors before and immediately after exercise in 32 normal subjects and 12 patients with the ischemic ST depression. Exercise was performed on a bicycle ergometer. The workload was increased in a stepwise manner. The duration from QRS onset to the maximum magnitude of QRS vector did not change significantly before and after exercise in normal subjects and the patients. The terminal QRS vectors after exercise were shifted toward the right and superior in normal subjects and the patients. The spatial magnitude of the QRS vectors decreased at the interval from 22 msec. to 34 msec. and increased at the interval from 58 msec. to 74 msec. after QRS onset after exercise in patients, but did not change in normal subjects. The azimuth and elevation of the QRS vectors at the interval except the late phase after QRS onset did not change significantly before and after exercise in normal subjects and the patients.

Therefore, this decreased or increased spatial magnitude of QRS vectors after exercise in the patients with ST depression may be related to the myocardial ischemia.


Copyright © 1983, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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