The aim of this study was to evaluate an exercise test in pediatric liver transplant recipients and its relation to their cardiac function. This cross-sectional study was conducted on 58 children who had successfully undergone orthotopic liver transplantation at least 6 months prior to the study, with the same age and gender-matched control group. M-mode, Doppler, tissue Doppler echocardiography and an exercise test were performed for all the participants. The VO values and METS in patients were less than the control (P = 0.001). Left ventricular posterior wall thickness in systole, left ventricular posterior wall thickness in diastole, interventricular septum diameter in diastole, A, pulmonary acceleration time, S and Ea, Aa, and S had a significant difference between patients and the control group (P value < 0.05). Maximal oxygen consumption (Max VO) and metabolic equivalent task (METs) values had a significant correlation with tricuspid valve S parameter (P = 0.018, r = 0.310). Max VO and METs values did not have a significant correlation with the diastolic dysfunction index, such as E/A and E/Ea. In this study, the exercise test showed decreased functional capacity in liver-transplanted children; however, the echocardiographic evaluation did not reveal any definite correlation with systolic or diastolic dysfunction.
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