Changes in Intra-QRS Frequency Distribution Induced by Exercise Stress Test and Percutaneous Coronary Intervention in Patients with Coronary Heart Disease

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概要

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• <B>Purposes:</B> The aim of this study was to investigate the intra-QRS frequency distribution induced by transient myocardial ischemia. <B>Methods:</B> Sixty patients undergoing the exercise stresses Tl201scintigraphy (Tl201scinti.) and ten patients undergoing percutaneous coronary intervention (PCI) were subjects in this study. ECGs were recorded before and after Tl201scinti. or PCI. The wavelet transform using Gabor function was applied to time-frequency analysis of ECGs. The frequency power during QRS was integrated every 80 scale bands, ranged from 1 to 150 Hz, (ITFP; integrated time frequency powers) by which an intra-QRS frequency distribution was represented. <B>Results:</B> The ITFP was changed in 47.5% cases with positive Tl201scinti. In 11 cases, the ITFP was significantly increased in the average frequency range from 72.2 to 90.3 Hz, and significantly decreased from 20.5 to 39.0 Hz in 8 cases after Tl201scinti. The similar changes in the ITFP induced by transient myocardial ischemia were observed during the time course of PCI. <B>Conclusions:</B> These results suggested that exercise-induced ischemia affects the distribution of frequency power within QRS complex. This analysis may offer a new information about invisible QRS changes by exercise-induced ischemia.

• 日本不整脈学会の論文

著者

• Sezaki Kazunori

  Shin-Yamanote Hospital

• Tsutsumi Takeshi

  Department Of Applied Biological Science Science University Of Tokyo

• Nakajima Toshiaki

  Department Of Cardiology Tokyo University

• Yamamoto Yumiko

  Department Of Bacteriology Okayama University Graduate School Of Medicine Dentistry And Pharmaceutical Sciences

• Tsutsumi Takeshi

  Department of Ischemia Circulatory Physiology, University of Tokyo

• Takano Nami

  Department of Ischemia Circulatory Physiology, University of Tokyo

• Iwasawa Kuniaki

  Division of Health Service Promotion, University of Tokyo

• Sezaki Kazunori

  Shin-Yamanote Hospital Cardiovasculaer Medical & Surgical Center

• Yamamoto Yumiko

  Department of Ischemia Circulatory Physiology, University of Tokyo

• Nakajima Toshiaki

  Department of Ischemia Circulatory Physiology, University of Tokyo

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