Document Detail


Exercise-induced torsional dyssynchrony relates to impaired functional capacity in patients with heart failure and normal ejection fraction.
MedLine Citation:
PMID:  23221388     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Left ventricular (LV) systole and diastole are intimately dependent on myocardial torsion, which involves coupling between myocardial rotation (twisting in systole and untwisting in diastole) and longitudinal motion. Heart failure with normal ejection fraction (HFNEF) is known to involve exercise-induced wall motion abnormalities, but torsion on exercise has not been explored. We hypothesised that torsional dyssynchrony may also be involved and be exaggerated by exercise. METHODS AND RESULTS: 67 patients (age 73±7 years, 45 female) with HFNEF and 38 controls underwent cardiopulmonary exercise testing and echocardiography at rest and on supine exercise. Analysis of three plane motions was performed using speckle tracking and tissue Doppler imaging. Torsional dyssynchrony was quantified as the SD of the time to peak systolic motion (SDSM) (basal and apical rotation, longitudinal and radial displacement); the time difference between peak twist and peak longitudinal displacement (twist-longitudinal motion delay, TLMD) and the ratio of untwist to longitudinal extension (UT:LE). At rest, HFNEF patients had similar SDSM, TLMD and UT:LE compared with controls. Exercise was associated with significantly more dyssynchrony in the HFNEF patients (SDSM 38.8±27.6 ms vs 25.9±15.5 ms, p=0.02; TLMD 28.4±46.2 ms vs 2.9±31.2 ms, p=0.005 and UT:LE 10.4±15.3 vs 3.3±3.8, p=0.022). The SDSM correlated positively with LV wall thickness (r=0.31, p=0.015) and negatively with peak oxygen consumption (r=-0.299, p=0.01) and changes in stroke volume on exercise (r=-0.371, p=0.001). CONCLUSIONS: HFNEF involves exercise-induced torsional dyssynchrony in systole and diastole, which relates to LV hypertrophy as well as exercise capacity.
Authors:
Yu Ting Tan; Frauke Wg Wenzelburger; John E Sanderson; Francisco Leyva
Related Documents :
8743188 - Influence of maximal ergometric exercise on endothelin concentrations in relation to mo...
689008 - Lactate kinetics after short strenuous exercise in man.
24292128 - Endovascular aortic repair increases vascular stiffness and alters cardiac structure an...
16020438 - Modeling the blood lactate kinetics at maximal short-term exercise conditions in childr...
3922208 - Adaptability of the pulmonary system to changing metabolic requirements.
3981308 - Exercise conditioning in children with asthma.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-6
Journal Detail:
Title:  Heart (British Cardiac Society)     Volume:  -     ISSN:  1468-201X     ISO Abbreviation:  Heart     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9602087     Medline TA:  Heart     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
University of Birmingham, , Birmingham, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Tumor suppressor function of the plasma glutathione peroxidase gpx3 in colitis-associated carcinoma.
Next Document:  Downregulation of Kv1.5 K Channels by the AMP-Activated Protein Kinase.