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Diffuse myocardial fibrosis in children after heart transplantation

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Journal of Cardiovascular Magnetic Resonance201416 (Suppl 1) :P135

https://doi.org/10.1186/1532-429X-16-S1-P135

  • Published:

Keywords

  • Cardiovascular Magnetic Resonance
  • Heart Transplantation
  • Short Axis Slice
  • Gadopentetate Dimeglumine
  • Cardiovascular Magnetic Resonance Study

Background

It is unclear if children after heart transplantation (HTX) are at risk for developing increased myocardial fibrosis. Diffuse myocardial fibrosis can be estimated by myocardial longitudinal relaxation (T1) times.

Methods

Twenty cardiovascular magnetic resonance (CMR) studies in 17 patients after HTX (mean age 13.2 years, range 1.2 - 17.4 years, 9 female) were analysed retrospectively and compared to CMR studies in nine healthy controls (mean age 12.1 years, range 9.2 - 16.7, 4 female). Patients with clinically significant rejection were excluded. T1 measurements were performed at a single mid-ventricular short axis slice orientation before and > 10 minutes after the application of 0.2 mmol/kg gadopentetate dimeglumine (Gd) in the interventricular septum (IVS), LV lateral wall and the complete LV myocardium (Image). The tissue-blood partition coefficient was calculated as a function of the ratio of T1 change of myocardium as compared to blood.

Results

Pre-contrast T1 times before the application of Gd were significantly higher in HTX patients compared to controls (LV lateral wall 977 ± 40 msec. versus 923 ± 12 msec., p < 0.001; IVS 1008 ± 32 msec. versus 974 ± 21 msec., p < 0.005; complete LV myocardium 992 ± 34 msec. versus 951 ± 16 msec., p < 0.005), whereas the reduced post-contrast T1 times in the HTX patients showed a trend towards being shorter than in controls but failed to reach statistical significance. Tissue-blood partition coefficients were elevated in patients after HTX in the LV lateral wall (0.45 ± 0.06 versus 0.40 ± 0.03, p < 0.01) and the complete LV myocardium (0.47 ± 0.06 versus 0.43 ± 0.03, p < 0.05). The difference in the IVS failed to reach statistical significance (0.48 ± 0.06 versus 0.45 ± 0.03, p = 0.122).

Conclusions

Diffuse fibrosis is present in children after HTX as evidenced by pre- and post-contrast myocardial T1 mapping. The technique may be suitable for the detection of early signs of adverse remodeling after HTX.

Funding

This study was partly funded by the Labatt Family Heart Centre, Witchell Fellowship, and by Siemens.
Figure 1
Figure 1

Tissue longitudinal relaxation (T1) kinetics, derived from a short axis image in a patient after heart transplantation. LV = left ventricle, RV = right ventricle. Light green = complete LV myocardium, red = septal myocardium, yellow = free wall LV myocardium, dark green = blood pool.

Authors’ Affiliations

(1)
Labatt Family Heart Centre in the Department of Paediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
(2)
Healthcare Sector, Siemens AG, Erlangen, Germany

Copyright

© Riesenkampff et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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