Comparative assessment of circulatory autonomic regulation in the patients with coronary artery bypass graft or valvular heart disease correction

The objective of our study was to investigate the features of circulatory autonomic regulation in the patients with a coronary artery bypass graft surgery (CABG) or correction of a valvular heart disease (CVHD). Material and Methods. Our study enrolled 42 patients (including 12 women) aged 63 (57; 67), who underwent CABG; and 36 patients (including 16 women) aged 58 (47; 65), who underwent CVHD. Simultaneous 15-minute recordings of electrocardiograms and photoplethysmograms (PPG) were performed on all patients before and after the surgery. We assessed and analyzed statistical and frequency-related measures of heart rate variability (HRV) and index of synchronization (S) among low-frequency (LF) oscillations in HRV and PPG. Results. The values of most autonomic regulation indices in our study did not have statistically significant differences among the patients with CABG and CVHD at all stages of research. The exception was represented by the heart rate, which was higher before CVHD (p=0.013). Conclusion. In all patients with CABG, the values of HRV and S did not depend on the differences in their clinical statuses or performed cardiac surgical interventions.