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Changes in Heart Rate and Heart Rate Variability During Surgical Stages to Completed Fontan Circulation
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Paediatrics.ORCID iD: 0000-0001-8818-8762
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.ORCID iD: 0000-0002-1313-0934
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
Department of Clinical Sciences Lund, Children Heart Centre, Skåne University Hospital, Lund University, Lund, Sweden.
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2021 (English)In: Pediatric Cardiology, ISSN 0172-0643, E-ISSN 1432-1971, Vol. 42, no 5, p. 1162-1169Article in journal (Refereed) Published
Abstract [en]

Arrhythmia is related to heart rate variability (HRV), which reflects the autonomic nervous regulation of the heart. We hypothesized that autonomic nervous ganglia, located at the junction of the superior vena cava’s entrance to the heart, may be affected during the bidirectional Glenn procedure (BDG), resulting in reduced HRV. We aimed to investigate changes in heart rate and HRV in a cohort of children with univentricular heart defects, undergoing stepwise surgery towards total cavopulmonary connection (TCPC), and compare these results with healthy controls. Twenty four hours Holter-ECG recordings were obtained before BDG (n = 47), after BDG (n = 47), and after total cavopulmonary connection (TCPC) (n = 45) in patients and in 38 healthy controls. HRV was analyzed by spectral and Poincaré methods. Age-related z scores were calculated and compared using linear mixed effects modeling. Total HRV was significantly lower in patients before BDG when compared to healthy controls. The mean heart rate was significantly reduced in patients after BDG compared to before BDG. Compared to healthy controls, patients operated with BDG had significantly reduced heart rate and reduced total HRV. Patients with TCPC showed reduced heart rate and HRV compared with healthy controls. In patients after TCPC, total HRV was decreased compared to before TCPC. Heart rate was reduced after BDG procedure, and further reductions of HRV were seen post-TCPC. Our results indicate that autonomic regulation of cardiac rhythm is affected both after BDG and again after TCPC. This may be reflected as, and contribute to, postoperative arrhythmic events.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 42, no 5, p. 1162-1169
Keywords [en]
Fontan hjärtfrekvensvariabilitet
National Category
Pediatrics
Research subject
Cardiology; Pediatrics
Identifiers
URN: urn:nbn:se:umu:diva-156713DOI: 10.1007/s00246-021-02595-0ISI: 000638870600001PubMedID: 33837840Scopus ID: 2-s2.0-85104152599OAI: oai:DiVA.org:umu-156713DiVA, id: diva2:1291563
Funder
Swedish Heart Lung FoundationVästerbotten County Council
Note

Originally included in thesis in manuscript form with title: "Changes in heart rate variability during surgical stages to completed Fontan circulation"

Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2022-10-03Bibliographically approved
In thesis
1. Heart rate variability and pacemaker treatment in children with Fontan circulation
Open this publication in new window or tab >>Heart rate variability and pacemaker treatment in children with Fontan circulation
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Fontan surgery is performed in children with univentricular heart defects. Arrhythmias are frequent complications, occasionally requiring pacemaker treatment. Previous data regarding indications and risk factors for pacemaker treatment in Fontan patients is limited and conflicting. Heart rate variability (HRV) reflects autonomous nervous activity controlling the sinus node and has been associated with tachyarrhythmias in both adults and children, as well as in adults with sinus node dysfunction (SND).

Aim: To study HRV, arrhythmia and pacemaker treatment  in children with Fontan circulation— with the purpose of contributing to the reduction of long term complications in this patient group.

Methods: We have retrospectively reviewed pacemaker therapy in all Swedish patients who underwent Fontan surgery from 1982 to 2017 (n=599). We have also analysed HRV from 24-hour Holter ECG recordings in 112 children with Fontan circulation and in children with univentricular heart defects before bidirectional Glenn (BDG) procedure (n=47), before and on completion of Fontan surgery (n=47 and 45 respectively). Analysis was performed by power spectral analysis and Poincaré method, and results compared with healthy controls. Furthermore, HRV was analysed in Fontan patients who later required a pacemaker due to severe SND. Results were compared with Fontan patients who had SND, without indication for pacemaker treatment, with patients with Fontan circulation without SND and healthy controls. In addition we evaluated the possibility to analyse arrhythmias and HRV in 27 Fontan children using intermittent ECG recordings with a handheld devices at home during a 14-day period.

Results: After a mean follow-up of 12 years, 13% (78/599) of patients with Fontan circulation had received a pacemaker. Patients operated with the extracardiac conduit (EC) had a significantly lower prevalence of pacemaker implantation (6%) than patients with a lateral tunnel (LT) (17%). The most common pacemaker indication in patients with Fontan circulation was SND (64%). Children with Fontan circulation showed significant reductions in several HRV parameters, compared with controls. No significant differences were found between patients operated with LT versus EC (paper I). After BDG the RR interval and SD2 (representing changes in heart rate over 24-hours) significantly increased compared to pre-BDG. Compared with healthy controls, patients post-BDG, had significantly longer RR intervals and reduced overall HRV. PHF (reflecting parasympathetic control of the heart) was significantly reduced after TCPC as compared to before (paper II). Fontan patients with SND showed significantly elevated SD2 (representing changes in heart rate over 24-hours), somewhat reduced in patients that later required a pacemaker (Paper V). Handheld ECG analysis revealed frequent ventricular extra systoles in one patient and episodes of supraventricular tachycardia in another. Seven Fontan patients showed reduced HRV recorded with the handheld device over a 14-day period (paper III).

Conclusions: Overall HRV was reduced in patients with univentricular heart defects during the different surgical stages of Fontan surgery, compared to healthy controls. HRV was reduced in both patients with LT and EC with no significant difference between them. After BDG heart rate was significantly reduced as compared to before. PHF, reflecting the parasympathetic innervation of the heart was reduced after as compared to before TCPC. Pacemaker treatment is commonly needed in patients with Fontan circulation, and SND was the most prevalent indication for implantation. The prevalence of Fontan patients requiring pacemaker treatment was significantly lower in patients with EC. HRV analysis can contribute to management when following-up patients with Fontan circulation.

 

 

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2019. p. 85
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 2022
Keywords
Congenital heart disease, Fontan circulation, heart rate variability, pacemaker, sinus node dysfunction
National Category
Pediatrics
Research subject
Pediatrics; Cardiology
Identifiers
urn:nbn:se:umu:diva-156727 (URN)978-91-7855-007-4 (ISBN)
Public defence
2019-03-22, Sal D, Unod T9, Norrlands universitetssjukhus, Umeå, 09:00 (English)
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Supervisors
Available from: 2019-03-01 Created: 2019-02-25 Last updated: 2022-10-03Bibliographically approved

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Alenius Dahlqvist, JennyWiklund, UrbanRydberg, Annika

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