Left ventricular myocardial response to exercise in children after heart transplant

Barbara Cifra, Andreea Dragulescu, Henrik Brun, Cameron Slorach, Mark K. Friedberg, Cedric Manlhiot, Brian W. McCrindle, Anne Dipchand, Luc Mertens

Research output: Contribution to journalArticle

Abstract

Background Data on myocardial response to exercise after pediatric heart transplant (HTx) are limited. In this study we used semi-supine bicycle ergometry (SSCE) stress echocardiography to evaluate left ventricular (LV) systolic and diastolic reserve in pediatric HTx recipients. Methods Forty-three HTx patients and 23 controls underwent stepwise SSCE stress echocardiography. Color tissue Doppler imaging (TDI) peak systolic (s′) and early diastolic (e′) velocities in The LV lateral wall and basal septum, and LV peak global longitudinal and circumferential strain were measured at rest and during different stages of exercise. LV myocardial acceleration during isovolumic contraction (IVA) was measured at incremental heart rates (HRs) to determine The force-frequency relationship (FFR). Results At rest, compared with controls, HTx patients showed lower TDI velocities in The basal septum (s′: 4.7 ± 1.1 vs 5.8 ± 0.8 cm/s, p = 0.002; e′: 8.5 ± 2.1 vs 11.3 ± 1.7 cm/s, p < 0.001), whereas in The LV lateral wall only e′ was lower (11.2 ± 2.6 vs 13.8 ± 2.3 cm/s, p < 0.001). LV IVA was not different between The groups (p = 0.10). LV peak global longitudinal strain was lower in HTx patients (18 ± 1.9% vs 20 ± 2.2%, p = 0.001), but peak circumferential strain was not different (p = 0.50). At peak, HR was lower in The HTx group (141 ± 12 vs 165 ± 15, p < 0.001), and all systolic and diastolic parameters, except circumferential strain, were lower in HTx recipients. When assessing The increase in TDI and strain values in relation to HR, The slopes were not significantly different between patients and controls. Conclusions Despite resting differences in myocardial functional parameters, pediatric HTx recipients have preserved LV diastolic and systolic myocardial reserve in response to exercise.

Original languageEnglish (US)
Pages (from-to)1241-1247
Number of pages7
JournalJournal of Heart and Lung Transplantation
Volume33
Issue number12
DOIs
StatePublished - Dec 1 2014
Externally publishedYes

Keywords

  • children
  • exercise
  • heart transplantation
  • speckle tracking strain
  • stress imaging
  • tissue Doppler imaging

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine
  • Transplantation

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  • Cite this

    Cifra, B., Dragulescu, A., Brun, H., Slorach, C., Friedberg, M. K., Manlhiot, C., McCrindle, B. W., Dipchand, A., & Mertens, L. (2014). Left ventricular myocardial response to exercise in children after heart transplant. Journal of Heart and Lung Transplantation, 33(12), 1241-1247. https://doi.org/10.1016/j.healun.2014.07.011