https://scholars.lib.ntu.edu.tw/handle/123456789/611877
標題: | Time-frequency analysis of the EGG in the diagnosis of vasovagal syndrome in older people | 作者: | Ebden M.J. Tarassenko L. Payne S.J. Darowski A. Price J.D. STEPHEN JOHN PAYNE |
關鍵字: | Blood vessel prostheses;Cardiovascular system;Electrocardiography;Frequency domain analysis;Neurology;Time domain analysis;Heart rate variability (HRV);Vasovagal syncopes;Vasovagal syndromes;Biomedical engineering | 公開日期: | 2004 | 卷: | 26 I | 起(迄)頁: | 290-293 | 來源出版物: | Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings | 摘要: | The Smoothed Pseudo Wigner-Ville Distribution (SPWVD) is used for the time-frequency analysis of variations in RR interval. A novel technique to determine the smoothing window lengths is implemented, and a new heart rate variability (HRV) metric is developed, instantaneous center frequency variability (ICFV), which uses the time-frequency map generated by the SPWVD. The technique is then applied to 50 patients with unexplained falls and age > 60, under-going head-upright tilt table testing (HUT). Eighteen of the patients were diagnosed with vasovagal syndrome. Attempts at syncope prediction using the new metric is an improvement on traditional techniques: an ICFV less than 0.07 Hz from 90 s to 180 s after tilt is predictive of a negative test (negative predictive value: 0.77). The comorbidity and autonomie degeneration present in elderly patients are thought to be responsible for lowering the negative predictive value. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-11044236949&partnerID=40&md5=5146d43030e19d4afc85f4805cd1ef2a https://scholars.lib.ntu.edu.tw/handle/123456789/611877 |
顯示於: | 應用力學研究所 |
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