Evaluation of the Left Ventricular Hemodynamic Status of Double-Root Translocation Patients Through Vector Flow Mapping

The double-root translocation (DRT) procedure is considered as a new choice for surgical management of complex congenital heart disease. Our study aims to investigate the left ventricular hemodynamic status after DRT by energy loss (EL), involving 42 patients who underwent DRT as well as 42 healthy volunteers as controls. The EL of left ventricle (LV) during different periods (rapid filling-RF, atrial contraction-AC, isovolumic contraction-IVC, rapid ejection-RE) of the same cardiac cycle were obtained and analyzed. Compared to the controls, global LV and apical three chamber-EL at AC and IVC periods in DRT group were higher (p < 0.05), and EL at RE period of DRT group was moderately lower. In the correlation analysis, the global EL at the RF was correlated with E wave (r = 0.47, p = 0.03), E/e′ (r = 0.50, p = 0.02), BSA (r = − 0.54, p = 0.01), and age (r = − 0.67, p < 0.001). AC and RE- global EL were significantly correlated with E/e′ (r = 0.49, r = 0.59, p < 0.05). There was a strong positive correlation between E/e′ and global EL at the IVC (r = 0.62, p = 0.003) and a moderate negative correlation with age (r = − 0.44, p = 0.04). The present study confirms that EL is a feasible and reproducible indicator for quantitatively evaluating LV hemodynamic status in patients who underwent DRT and reveals that DRT can lead to approximatively normal long-term hemodynamic performance of LV.