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
Journal of Heart and Lung Transplantation 2014, 33 (12): 1241-7

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.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"