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Published in: Journal of Cardiovascular Magnetic Resonance 1/2013

Open Access 01-12-2013 | Research

Diffuse myocardial fibrosis by T1-mapping in children with subclinical anthracycline cardiotoxicity: relationship to exercise capacity, cumulative dose and remodeling

Authors: Edythe B Tham, Mark J Haykowsky, Kelvin Chow, Maria Spavor, Sachie Kaneko, Nee S Khoo, Joseph J Pagano, Andrew S Mackie, Richard B Thompson

Published in: Journal of Cardiovascular Magnetic Resonance | Issue 1/2013

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Abstract

Background

The late cardiotoxic effects of anthracycline chemotherapy influence morbidity and mortality in the growing population of childhood cancer survivors. Even with lower anthracycline doses, evidence of adverse cardiac remodeling and reduced exercise capacity exist. We aim to examine the relationship between cardiac structure, function and cardiovascular magnetic resonance (CMR) tissue characteristics with chemotherapy dose and exercise capacity in childhood cancer survivors.

Methods

Thirty patients (15 ± 3 years), at least 2 years following anthracycline treatment, underwent CMR, echocardiography, and cardiopulmonary exercise testing (peak VO2). CMR measured ventricular function, mass, T1 and T2 values, and myocardial extracellular volume fraction, ECV, a measure of diffuse fibrosis based on changes in myocardial T1 values pre- and post-gadolinium. Cardiac function was also assessed with conventional and speckle tracking echocardiography.

Results

Patients had normal LVEF (59 ± 7%) but peak VO2 was 17% lower than age-predicted normal values and were correlated with anthracycline dose (r = −0.49). Increased ECV correlated with decreased mass/volume ratio (r = −0.64), decreased LV wall thickness/height ratio (r = −0.72), lower peak VO2(r = −0.52), and higher cumulative dose (r = 0.40). Echocardiographic measures of systolic and diastolic function were reduced compared to normal values (p < 0.01), but had no relation to ECV, peak VO2 or cumulative dose.

Conclusions

Myocardial T1 and ECV were found to be early tissue markers of ventricular remodeling that may represent diffuse fibrosis in children with normal ejection fraction post anthracycline therapy, and are related to cumulative dose, exercise capacity and myocardial wall thinning.
Appendix
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Metadata
Title
Diffuse myocardial fibrosis by T1-mapping in children with subclinical anthracycline cardiotoxicity: relationship to exercise capacity, cumulative dose and remodeling
Authors
Edythe B Tham
Mark J Haykowsky
Kelvin Chow
Maria Spavor
Sachie Kaneko
Nee S Khoo
Joseph J Pagano
Andrew S Mackie
Richard B Thompson
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Journal of Cardiovascular Magnetic Resonance / Issue 1/2013
Electronic ISSN: 1532-429X
DOI
https://doi.org/10.1186/1532-429X-15-48

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