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Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System
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[The relationship between supraventricular arrhythmia after coronary artery bypass grafting and autonomic nerve

Saihou Hayashi1, S Kohata, T Furukawa

  • 1Department of Cardiovascular Surgery, Chugoku Rosai Hospital, Kure, Japan.

Kyobu Geka. the Japanese Journal of Thoracic Surgery
|May 11, 2005
PubMed

Insights

Supraventricular arrhythmias post-coronary artery bypass grafting are linked to the parasympathetic nerve system. This study analyzed heart rate variability in patients, revealing a strong association with parasympathetic dominance.

Area of Science:

  • Cardiology
  • Autonomic Neuroscience

Context:

  • Supraventricular arrhythmias are common complications following coronary artery bypass grafting (CABG).
  • The role of the autonomic nervous system in these arrhythmias remains an area of investigation.

Purpose:

  • To investigate the association between supraventricular arrhythmias (premature atrial contractions and atrial fibrillation) and autonomic nerve system activity after CABG.
  • To analyze heart rate variability (HRV) parameters to assess sympathetic and parasympathetic nerve activity preceding arrhythmia onset.

Summary:

  • Heart rate variability was analyzed in 57 post-CABG patients, focusing on 25 premature atrial contraction (PAC) and 4 atrial fibrillation (AF) cases.
  • Analysis of HRV parameters (NN 50, RMSSD, HF, LF/HF) indicated that PACs occurred under parasympathetic dominance in 30% of cases, sympathetic dominance in 10%, and balanced conditions in 60%.
  • Atrial fibrillation cases showed a higher prevalence of occurrence under parasympathetic conditions (3 out of 4 cases).

Impact:

  • The findings suggest a significant association between supraventricular arrhythmias after CABG and the parasympathetic nervous system.
  • This research may inform strategies for managing or preventing post-CABG arrhythmias by targeting autonomic balance.

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