Heart rate variability following coronary artery bypass graft surgery as a function of recovery time, posture, and exercise

Canadian Journal of Physiology and Pharmacology
C Ann BrownJ L Parlow

Abstract

This study examined the claim made by Niemela et al. (1992) that the decline in heart rate variability after coronary artery bypass graft surgery is irreversible. We tested six women and 16 men six and 12 weeks postoperative in three postures: in the supine position, in the standing position, and during low-intensity steady-state exercise. Beat-by-beat arterial blood pressure and electrocardiographic R-R interval data were collected continuously for 10 min in each condition. R-R interval data were analyzed with spectral analysis; baroreflex data were analyzed using the sequence method. Our results show that the indices of parasympathetic modulation improved over time, as seen by an increased spontaneous baroreflex sensitivity and parasympathetic indicator, that both indices were affected by posture, and that spontaneous baroreflex sensitivity was also affected by low-intensity exercise. The effects of posture are consistent with attenuated responses of healthy older subjects to orthostatic stress. Similarly, the effects of low-intensity exercise are consistent with findings in healthy subjects. We found that spontaneous baroreflex sensitivity declined during exercise, whereas, in healthy subjects, this is maintained during low-...Continue Reading

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Citations

Aug 10, 2011·Biomedizinische Technik. Biomedical Engineering·Beatrice RetzlaffRobert Bauernschmitt
Nov 26, 2009·Cardiology Research and Practice·Nenad LakusicDusko Cerovec
Apr 4, 2007·Computer Methods and Programs in Biomedicine·Hsiao-Lung ChanChun-Hsien Lin
May 9, 2012·International Journal of Cardiology·Nenad LakusicFranjo Baborski
Nov 7, 2019·Biological Research for Nursing·Ingrid K M BrennerPeter M Brown
Aug 28, 2010·Biological Research for Nursing·Sherri S StutzmanBarbara S Kisilevsky
May 7, 2013·The International Journal of Artificial Organs·Leonida CompostellaFabio Bellotto

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