Effect of Deep Breathing on Heart Rate Variability Following Coronary Artery Bypass Graft

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.

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Comparison of the effect of incentive spirometry and deep breathing exercises on hemodynamic parameters of patients undergoing coronary artery bypass graft surgery: A Clinical Trial

10.21203/rs.3.rs-354219/v1 ◽

2021 ◽

Author(s):

Maasoumeh Barkhordari-Sharifabad ◽

Fatemeh Zerang

Keyword(s):

Coronary Artery ◽

Coronary Artery Bypass Graft ◽

Coronary Artery Bypass ◽

Artery Bypass ◽

Bypass Graft ◽

Deep Breathing ◽

Artery Bypass Graft ◽

Breathing Exercises ◽

The Mean ◽

Incentive Spirometry

Abstract Background Hemodynamic changes are among the common complications after coronary artery bypass graft (CABG) surgery. Incentive spirometry and deep breathing exercises are widely used in patients undergoing coronary artery bypass graft surgery. The aim of the present study was to compare the effect of incentive spirometry and deep breathing exercises on hemodynamic parameters of patients undergoing coronary artery bypass graft surgery. Methods This is a clinical trial that was performed on 40 heart patients who were candidates for coronary artery bypass graft surgery. Participants were selected using convenience sampling and then randomly divided into two groups. One day before surgery, one group was taught how to perform deep breathing exercises (DBE) and the other group was taught how to use incentive spirometry in practice. Hemodynamic indices were measured and recorded before the intervention, the first, second, and the third day after the intervention. Data analysis was carried out using SPSS ver.16 and descriptive and inferential statistical tests. Findings: The mean systolic blood pressure (SBP) and diastolic blood pressure (DBP) on the first day after the intervention in patients undergoing the incentive spirometry group was significantly higher than the DBE group (p < 0.05). On the third day after the intervention, the mean arterial SaO2 in patients of the incentive spirometry group was significantly higher than the DBE group and the mean respiratory rate (RR) in patients in the incentive spirometry group was significantly lower than the DBE group (p < 0.05). However, there was no significant difference between the two groups in terms of other indices (p > 0.05). Conclusion The results showed that incentive spirometry has a greater effect on hemodynamic indices of patients undergoing CABG compared to DBE, so, it is recommended to use incentive spirometry to improve hemodynamic indices in these patients. Trial registration: Iranian Registry of Clinical Trials (IRCT), IRCT20191028045267N1. Registered 12 March 2020, https://www.irct.ir/trial/43365

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