Introduction: The prognosis of children with pulmonary hypertension is dependent on right ventricular performance. The aim of the study was to assess the role of right ventricular speckle tracking in evaluation of right ventricular function in children with idiopathic pulmonary arterial hypertension compared with conventional echocardiography. Methods: We evaluated prospectively 10 children (5 with idiopathic pulmonary hypertension and 5 age and sex match controls) using speckle tracking echocardiography (Q LAB 10.0 soft ware), conventional echocardiography and clinical parameters (6 minute walking test). The right ventricular free wall longitudinal strain was calculated by averaging three regional peak systolic longitudinal strain. There were also studied the conventional echocardiographic parameters: tricuspid annular plane systolic excursion, right ventricular fractional area change, right ventricular myocardial performance index, left ventricular eccentricity index. Results: Right ventricular free wall longitudinal strain was signifi cantly lower in pulmonary hypertension children than in controls (p = 0.03). Right ventricular free wall longitudinal strain was correlated with 6 minute walking distance, right ventricular fractional area change, right ventricular myocardial performance index (r = – 0.69, r = – 0.77, r = 0.80 with a p < 0.05). Conclusions: Right ventricular speckle tracking could be useful in noninvasive assessment of right ventricle performance in children with idiopathic pulmonary arterial hypertension.