title: Complexity of the short-term heart-rate variability.
abstract: This work has proposed a methodology based on the concept of entropy rates to study the complexity of the short-term heart-rate variability (HRV) for improving risk stratification to predict sudden cardiac death (SCD) of patients with established ischemic-dilated cardiomyopathy (IDC). The short-term HRV was analyzed during daytime and nighttime by means of RR series. An entropy rate was calculated on the RR series, previously transformed to symbol sequences by means of an alphabet. A statistical analysis permitted to stratify high- and low-risk patients of suffering SCD, with a specificity (SP) of 95% and sensitivity (SE) of 83.3%.
authors.affiliation: Department ESAII, Universitat Politecnica de Catalunya, C/Pau Gargallo 5, 08028 Barcelona, Spain. jose.fernando.valencia@upc.edu
authors.forename: Jose F
authors.initials: JF
authors.lastname: Valencia
authors.forename: Montserrat
authors.initials: M
authors.lastname: Vallverdú
authors.forename: Rico
authors.initials: R
authors.lastname: Schroeder
authors.forename: Andreas
authors.initials: A
authors.lastname: Voss
authors.forename: Rafael
authors.initials: R
authors.lastname: Vázquez
authors.forename: Antonio
authors.initials: A
authors.lastname: Bayés de Luna
authors.forename: Pere
authors.initials: P
authors.lastname: Caminal
mesh_terms: D000368:Aged; D000465:Algorithms; D002311:Cardiomyopathy, Dilated / Q000175:diagnosis / Q000503:physiopathology*; D016757:Death, Sudden, Cardiac / Q000517:prevention & control; D019277:Entropy; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D017711:Nonlinear Dynamics; D011237:Predictive Value of Tests; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D018709:Statistics, Nonparametric