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Heart Failure Summit Review: cardiac re-synchronisation therapy in the failing heart*

Published online by Cambridge University Press:  17 September 2015

Mitchell I. Cohen*
Affiliation:
Chief of Pediatric Cardiology, Phoenix Children’s Hospital, Clinical Associate Professor of Pediatrics, University of Arizona School of Medicine-Phoenix, Phoenix, Arizona, USA
*
Correspondence to: M.I. Cohen, MD, FACC, FHRS, Chief of Pediatric Cardiology & Co-Director of the Heart Center, Phoenix Children’s Hospital, Clinical Associate Professor of Pediatrics, University of Arizona School of Medicine-Phoenix. Tel: 602-933-1000; Fax: 602-933-4166; E-mail: mitchcohenmd@gmail.com

Abstract

Extrapolating cardiac resynchronization therapy (CRT) to pediatric patients with heart failure has at times been difficult given the heterogeneity of pediatric cardiomyopathies, varying congenital heart disease (CHD) substrates, and the fact that most pediatric heart failure patients have right bundle branch block (RBBB) as opposed to LBBB. Yet, despite these limitations a number of multi-center retrospective studies in North America and Europe have identified some data to suggest that certain sub-populations tend to respond positively to CRT. In order to address some of the heterogeneity it is helpful to subdivide pediatric and young adult patients with CHD into four potential groups: (1) CRT for chronic RV pacing, (2) dilated cardiomyopathies, (3) pulmonary right ventricles, and (4) systemic right ventricles. The chronic RV paced group, especially long-standing RV apical pacing, with ventricular dyssynchrony has consistently shown to be the group that best responds to a proactive resynchronization course. CRT therapy in pulmonary right ventricles such as post-op tetralogy of Fallot have shown some promise and may be considered especially if there is evidence of concomitant left ventricular dysfunction with an electrical dyssynchrony. Patients with systemic right ventricles such as post-atrial baffle surgery or congenitally corrected transposition reportedly do well with CRT in the presence of both inter-ventricular and intra-ventricular dyssynchrony. There is little doubt that moving forward to best way to identify which pediatric patients with heart failure will respond to CRT, will require a collaborative effort between the electrophysiologist and the echocardiographer to identify appropriate candidates with electrical and mechanical dyssynchrony.

Type
Original Articles
Copyright
© Cambridge University Press 2015 

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Footnotes

*

Presented at Johns Hopkins All Children’s Heart Institute, International Pediatric Heart Failure Summit, Saint Petersburg, Florida, United States of America, 4–5 February, 2015.

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