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Novel cardiac nuclear magnetic resonance method for noninvasive assessment of myocardial fibrosis in hemodialysis patients

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posted on 25.10.2016 by Matthew P.M. Graham-Brown, Daniel S. March, Darren R. Churchward, David Stensel, Anvesha Singh, Ranjit Arnold, James O. Burton, Gerry P. McCann
Left ventricular hypertrophy and myocardial fibrosis frequently occur in patients with end-stage renal disease receiving hemodialysis therapy and are associated with poor prognosis. Native T1 mapping is a novel cardiac magnetic resonance imaging technique that measures native myocardial T1 relaxation, a surrogate of myocardial fibrosis. Here we compared global and segmental native myocardial T1 time and global longitudinal, circumferential and segmental strain, and cardiac function of 35 hemodialysis patients and 22 control individuals. The median native global T1 time was significantly higher in the hemodialysis than the control group (1270 vs. 1085 ms), with the septal regions of hemodialysis patients having significantly higher median T1 times than nonseptal regions (1293 vs. 1252 ms). The mean peak global circumferential strain and global longitudinal strain were both significantly reduced in hemodialysis patients compared with controls (–18.3 vs. –21.7 and –16.1 vs. –20.4, respectively). Systolic strain was also significantly reduced in the septum compared with the nonseptal myocardium in hemodialysis patients (–16.2 vs. –21.9) but not in control subjects. Global circumferential strain and longitudinal strain significantly correlated with global native T1 values (r = 0.41 and 0.55, respectively), and the septal native T1 significantly correlated with the septal systolic strain (r = 0.46). Thus, myocardial fibrosis may be assessed noninvasively with native T1 mapping; the interventricular septum appears to be particularly prone to the development of fibrosis in hemodialysis patients.

Funding

This study is independent research arising from a Clinician Scientist Award (Dr James Burton, CS-2013-13-014) supported by the NIHR, an NIHR grant to Gerald McCann (NIHR-CDF 2014-07-045) and a grant from the Van Geest Foundation. This work is also supported by the NIHR Leicester Cardiovascular Biomedical Research Unit based at University Hospitals of Leicester and the University of Leicester and the NIHR Diet, Lifestyle & Physical Activity Biomedical Research Unit.

History

School

  • Sport, Exercise and Health Sciences

Published in

Kidney International

Volume

90

Issue

4

Pages

835 - 433

Citation

GRAHAM-BROWN, M.P.M. ... et al, 2016. Novel cardiac nuclear magnetic resonance method for noninvasive assessment of myocardial fibrosis in hemodialysis patients. Kidney International, 90 (4), pp. 835-433

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

08/07/2016

Publication date

2016-09-13

Copyright date

2016

Notes

This paper was accepted for publication in the journal Kidney International and the definitive published version is available at http://dx.doi.org/10.1016/j.kint.2016.07.014.

ISSN

1523-1755

Language

en

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