Evaluation of cardiac autonomic modulation using symbolic dynamics after cardiac transplantation
Rev. bras. cir. cardiovasc
;
34(5): 572-580, Sept.-Oct. 2019. tab, graf
Article
in English
| LILACS
| ID: biblio-1042041
ABSTRACT
Abstract Objective:
To characterize the behavior of cardiac autonomic modulation in individuals with different times after orthotopic heart transplantation (HTx) using symbolic dynamics analysis.Methods:
Sixty patients were evaluated after HTx. We recorded their instantaneous R-R intervals (RRi) by cardiac monitor Polar® RS800CX™ (Polar Electro Oy, Kempele, Finland) for 10 minutes. The same sequence of RRi with 256 consecutive beats was used to perform spectral analysis and symbolic dynamics analysis. We used hierarchical clustering to form groups. One-way analysis of variance (ANOVA) (with Holm-Sidak method) or one-way Kruskal-Wallis test (with Dunn´s post-hoc test) was used to analyze the difference between groups. Linear correlation analysis between variables was performed using Pearson's or Spearman's tests. P-value < 0.05 was considered statistically significant.Results:
The 0V% index increased, the 2UV% index and the normalized complexity index decreased with an increase of HTx postoperative time. There were a negative correlation between complexity indexes and 0V% and a positive correlation between complexity indexes and 2UV%.Conclusion:
Symbolic dynamics indexes were able to show a specific cardiac autonomic modulation pattern for HTx recipients with different postoperative times.
Full text:
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Index:
LILACS (Americas)
Main subject:
Parasympathetic Nervous System
/
Sympathetic Nervous System
/
Heart Transplantation
/
Nonlinear Dynamics
/
Heart
Type of study:
Observational study
/
Prevalence study
/
Prognostic study
/
Risk factors
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
English
Journal:
Rev. bras. cir. cardiovasc
Journal subject:
Cardiology
/
General Surgery
Year:
2019
Type:
Article
Affiliation country:
Brazil
/
Italy
Institution/Affiliation country:
Federal University of Sergipe/BR
/
Federal University of São Carlos/BR
/
Medical School of São José do Rio Preto/BR
/
Universidade de São Paulo/BR
/
University of Milan/IT
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