Copyright © 1992 by the European Society of Cardiology.
© 1992 The European Society of Cardiology
Effect of coronary artery bypass grafting on cardiac parasympathetic nervous function
*Cardiovascular Division, Department of Medicine, Oulu University Central Hospital Oulu, Finland
Department of Clinical Physiology, Turku University Central Hospital Turku, Finland
Received 11 June 1991; revised 28 October 1991; .
Correspondence to- Matti J. Niemela, Cardiovascular Division, Department of Medicine, Oulu University Central HospitaJ, SF-90220 Oulu, Finland.
Abstract
Low heart rate variability (HRV) is a predictor of a poor outcome after myocardial infarction. To determine whether coronary artery bypass grafting (CABG) has any effect on H RV, the power spectrum components of HRV were measured in 35 patients before, and J week after, CA BG. Significant attenuation of all spectral components of HR V were found after CABG (P<0.001). High frequency (HF) power decreased to one third of the preoperative level, mid-frequency (MF) power to as little as one fifteenth and low frequency (LF) power to one seventh of the preoperative level. No significant restoration in MF or HF powers occurred during the 6-week follow-up period.
The results suggest that CABG causes a marked attenuation of HRV. The prognostic significance of this attenuation is not known.
Key Words: Coronary artery bypass grafting • autonomic nervous function • heart rate variability
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