title: Heart rate variability and atria function in children at late follow-up evaluation after atrioventricular node slow-pathway radiofrequency ablation.
abstract: This study was designed to assess the changes in the conductive system, autonomic dysfunction, and global and regional function of the atria and ventricles in children late after slow-pathway radiofrequency ablation (RFA). The study enrolled 22 children, who has successfully undergone RFA 2 to 5 years previously (RFA group) and 20 healthy children (control group). Electrophysiologic study was performed for the RFA group. Holter monitoring and echocardiography were performed for all the children. At a late follow-up assessment, the RFA children were free of paroxysms, whereas 8 of the 22 children (36%) reported transient palpitations. Both mean and maximal heart rates (HR) were significantly increased, whereas indices of HR variability (% of successive normal sinus RR intervals exceeding 50 ms [pNN50], root mean square of the successive normal sinus RR interval difference [rMSSD], high-frequency component [HFC]) were significantly decreased in the RFA group compared with preablation and control data. Left atrial (LA) and right atrial (RA) volumes were significantly higher, and atria deformation indices were significantly lower in the RFA group. Correlations were found between the mean HR and the volumes of LA (r = 0.477; p < 0.001) and RA (r = 0.512; p < 0.001). A negative correlation between the maximal LA volume and the longitudinal strain rate (SR) during relaxation (r = -0.476; p = 0.03) and a positive correlation between the minimal LA volume and both longitudinal SR (r = 0.361; p = 0.03) and strain (ε) (r = 0.375; p = 0.024) during contraction were shown. These data suggest a possible link between atrial dysfunction and the hyperadrenergic state after RFA.
authors.affiliation: Department of Children Diseases, Lithuanian University of Health Sciences, Eiveniu 2, Kaunas, LT, 50009, Lithuania. rima.sileikiene@kmuk.lt
authors.forename: Rima
authors.initials: R
authors.lastname: Sileikiene
authors.forename: Jolanta
authors.initials: J
authors.lastname: Vaskelyte
authors.forename: Vaida
authors.initials: V
authors.lastname: Mizariene
authors.forename: Irena
authors.initials: I
authors.lastname: Nedzelskiene
authors.forename: Raimonda
authors.initials: R
authors.lastname: Verseckaite
authors.forename: Renaldas
authors.initials: R
authors.lastname: Jurkevicius
authors.forename: Dalia
authors.initials: D
authors.lastname: Baksiene
authors.forename: Viktorija
authors.initials: V
authors.lastname: Sileikyte
authors.forename: Rimantas
authors.initials: R
authors.lastname: Kevalas
mesh_terms: D000293:Adolescent; D001283:Atrioventricular Node / Q000503:physiopathology / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D015716:Electrocardiography, Ambulatory / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000503:physiopathology / Q000601:surgery*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000503:physiopathology / Q000601:surgery*; D013997:Time Factors; D016896:Treatment Outcome