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Japanese

The Effect of Cardiac Surgery on the Cardiovascular Autonomic Nervous System observed by Analyzing Heart Rate Variability Yasuyo Taniguchi 1,2 , Kenji Ueshima 1,2 , Junya Kamata 2,3 , Kohei Kawazoe 2,3 , Katsuhiko Hiramori 1,2 1Second Department of Internal Medicine, Iwate Medical School 2Memorial Heart Center, Iwate Medical School 3Department of Cardiovascular Surgery, Iwate Medical University Keyword: 心拍変動 , 開心術 , 心臓自律神経機能 , heart rate variability , open heart surgery , autonomic nervous system pp.1113-1119
Published Date 2001/11/15
DOI https://doi.org/10.11477/mf.1404902382
  • Abstract
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 Epidemiological evidence indicates that depressed baroreflex sensitivity and heart rate variability (HRV) are associated with cardiac events after open heart surgery (OHS) or acute myocardial infarction. The aimof this study was to verify the changes in the autonomic balance by means of HRV assessment in patients who underwent OHS. We studied 14 patients who underwent OHS for valvular heart disease with preserved left ventricular (LV) function (ejection fraction, EF 72± %) (valve group, 5 males, 9 females, mean age 61 ± 7) and an age-matched group of 13 patients (CABG group, 11 males, 2 females EF 63±7 %) who underwent coronary artery bypass graft surgery. Using 24-hour Holter ECG monitoring before and up to 2 weeks after OHS, the following parameters with time domain analysis and frequency analysis were examined at two separate times (at 2 p.m. and at 2 a.m.). No cardiac events occurred during hospital days. Before OHS, low frequency (LF) power of the valve group at 2 p.m. was lower than that of the CABG group. After OHS, total heart rate increased and standard deviation of mean RR intervals (SDANN) in the time domain analysis decreased in both groups. In the frequency analysis, LF and high frequency (HF), the power of both groups also decreased after OHS. The LF/HF ratio of the valve group was significantly lower than that of the CABG group after OHS (p <0.05) both at 2 p.m. and 2 a.m. Furthermore, the LF/HF ratio of the valve group at 2 a.m. was over 1 and after OHS the circardian rhythm of heart rate variability was diminished in the valve group. Although OHS improved the circulatory blood flow system, the autonomic nervous system was suppressed immediately after surgery. Furthermore, vasomotor and cardiac autonomic tone after OHS may become depressed more significantly in valvular heart disease. Closed physiological observation might be needed after OHS for patients with valvular heart disease.


Copyright © 2001, 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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