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Influence of coronary artery bypass grafting on heart rate turbulence parameters

Iwona Cygankiewicz1, Jerzy Krzysztof Wranicz, Halina Bolinska

  • 1Institute of Cardiology, Medical University of Lodz, Lodz, Poland.

The American Journal of Cardiology
|July 13, 2004
PubMed

Insights

Coronary artery bypass grafting initially impairs heart rate turbulence (HRT) and heart rate variability (HRV) due to autonomic dysfunction. While HRV recovers, reduced HRT after 1 year suggests persistent baroreflex sensitivity impairment.

Area of Science:

  • Cardiology
  • Autonomic Nervous System Function
  • Baroreflex Sensitivity

Background:

  • Coronary artery disease (CAD) necessitates interventions like coronary artery bypass grafting (CABG).
  • Post-surgical cardiac function and autonomic regulation are critical areas of study.

Purpose of the Study:

  • To evaluate the impact of CABG on heart rate turbulence (HRT) and heart rate variability (HRV) parameters.
  • To assess the recovery of these parameters at 1-year follow-up post-CABG.

Main Methods:

  • Prospective evaluation of patients with CAD undergoing CABG.
  • Measurement of HRT and HRV parameters at baseline, 3 months, and 1 year post-surgery.

Main Results:

  • HRT and HRV parameters significantly worsened at 3 months post-CABG.
  • HRV parameters and turbulence onset normalized by 1 year.
  • Turbulence slope remained significantly attenuated at 1 year post-CABG.

Conclusions:

  • CABG causes early impairment of baroreflex sensitivity, indicated by attenuated HRT.
  • Autonomic nervous system dysfunction, suggested by depressed HRV, may underlie impaired baroreflex response post-CABG.
  • Persistent HRT attenuation suggests long-term effects on baroreflex function despite HRV recovery.

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