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Changes in global longitudinal strain during rest and exercise in patients treated with cardiac resynchronization therapy.
MedLine Citation:
PMID:  22681609     Owner:  NLM     Status:  In-Data-Review    
Relatively few data have been reported on prospective changes in global longitudinal strain (GLS) following cardiac resynchronization therapy (CRT), and none are available on GLS during physical exercise. We investigated the effects of CRT on GLS, assessed by speckle tracking two-dimensional (2D) echocardiography, at rest and during exercise after a mid-term follow-up. Twenty consecutive CRT patients (45% ischaemic) were assessed prospectively by speckle tracking 2D echocardiography before implant (at rest) and at mid-term follow-up (during rest and bicycle exercise). GLS, septum and lateral wall longitudinal strain, left ventricular ejection fraction (LVEF), and conventional functional variables were evaluated at baseline and follow-up. All patients completed the study protocol at rest. Exercise images were available in 90% of the patients. At follow-up, GLS improved at rest from -7·1 ± 2·6% to -9·1 ± 4·5% (P<0·01), with a further increase to -11 ± 5·1% during exercise (P<0·001). Longitudinal strain increased at rest both in the septum and in the lateral wall, with an additional increase during exercise in the lateral wall (P<0·05). GLS correlated with LVEF both at rest (r = -0·55 and r = -0·91 at baseline and 3 months, respectively; P<0·05) and during exercise (r = -0·89, P<0·05). Improvement in GLS during rest and exercise can be observed in CRT patients at mid-term follow-up and seems to correlate with changes in LVEF. GLS may be a valuable method to assess left ventricular function during rest and exercise.
Cinzia Valzania; Fredrik Gadler; Giuseppe Boriani; Maria J Eriksson
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Publication Detail:
Type:  Journal Article     Date:  2012-03-27
Journal Detail:
Title:  Clinical physiology and functional imaging     Volume:  32     ISSN:  1475-097X     ISO Abbreviation:  Clin Physiol Funct Imaging     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-06-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137604     Medline TA:  Clin Physiol Funct Imaging     Country:  England    
Other Details:
Languages:  eng     Pagination:  310-6     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors Clinical Physiology and Functional Imaging © 2012 Scandinavian Society of Clinical Physiology and Nuclear Medicine.
Cardiovascular Department, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
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