“Right Ventricle Speckle Tracking in Bronchopulmonary Dysplasia: One Year Follow Up”

Abstract Purpose: Bronchopulmonary dysplasia is still a main problem in preterm infants. The screening of secondary right ventricle (RV) failure concern neonatologist and pediatric cardiologists. Measurements of right ventricle deformation through speckle tracking analysis in echocardiography could help to early diagnosis.Methods: A prospective longitudinal study was carried out over 28 months at a tertiary care pediatric cardiology reference center. Under 32 weeks’ pre-term infants were eligible for the study. Twenty-eight days after birth, all enrolled patients were included in one group: no bronchopulmonary dysplasia (NO-BPD) or bronchopulmonary dysplasia (BPD). At 36 PMA, BPD patients were included in one group according to severity categorization (mild, moderate, severe). At three time points echocardiogram measurements were performed. Right ventricle strain was studied using speckle tracking analysis and it was compared with classical function parameters between groups and along time. Results: Fifty patients were enrolled in the study, 22 on NO-BPD group and 28 on BPD group (16 mild, 8 moderate, 4 severe). RV strain showed no statistical differences between groups. However, BDP group showed worse RV function than NO-BPD group, both in speckle tracking analysis and in classical parameters. During de follow-up, an improvement trend is shown in RV strain. Conclusions: RV longitudinal strain and strain rate derived by speckle tracking is feasible in preterm infants. Although it seems to be a good correlation between RV strain and BPD severity, authors cannot conclude it. More studies should be carried out to investigate the optimum echocardiographic screening model of RV dysfunction in BPD patients.