Doppler Flow Patterns in the Right Ventricle-to-Pulmonary Artery Shunt and Neo-Aorta in Infants with Single Right Ventricle Anomalies: Impact on Outcome after Initial Staged Palliations

作者：Frommelt Peter C^*; Gerstenberger Eric; Baffa Jeanne; Border William L; Bradley Tim J; Colan Steven; Gorentz Jessica; Heydarian Haleh; John J Blaine; Lai Wyman W; Levine Jami; Lu Jimmy C; McCandless Rachel T; Miller Stephen; Nutting Arni; Ohye Richard G; Pearson Gail D; Wong Pierre C; Cohen Meryl S

来源：Journal of the American Society of Echocardiography, 2013, 26(5): 521-529.

DOI：10.1016/j.echo.2013.02.012

• Hypoplastic left heart syndrome
• Norwood
• Echocardiography
• Single ventricle

Background: A Pediatric Heart Network trial compared outcomes in infants with single right ventricle anomalies undergoing Norwood procedures randomized to modified Blalock-Taussig shunt (MBTS) or right ventricle-to-pulmonary artery shunt (RVPAS). Doppler patterns in the neo-aorta and RVPAS may characterize physiologic changes after staged palliations that affect outcomes and right ventricular (RV) function. %26lt;br%26gt;Methods: Neo-aortic cardiac index (CI), retrograde fraction (RF) in the descending aorta and RVPAS conduit, RVPAS/neo-aortic systolic ejection time ratio, and systolic/diastolic (S/D) ratio were measured early after Norwood, before stage II palliation, and at 14 months. These parameters were compared with transplantation-free survival, length of hospital stay, and RV functional indices. %26lt;br%26gt;Results: In 529 subjects (mean follow-up period, 3.0 +/- 2.1 years), neo-aortic CI and descending aortic RF were significantly higher in the MBTS cohort after Norwood. The RVPAS RF averaged %26lt;25% at both interstage intervals. Higher pre-stage II descending aortic RF was correlated with lower RV ejection fraction (R = -0.24; P = .032) at 14 months for the MBTS cohort. Higher post-Norwood CI (5.6 vs 4.4 L/min/m(2), P = .04) and lower S/D ratio (1.40 vs 1.68, P = .01) were correlated with better interstage transplantation-free survival for the RVPAS cohort. No other Doppler flow patterns were correlated with outcomes. %26lt;br%26gt;Conclusions: After the Norwood procedure, infants tolerated significant descending aortic RF (MBTS) and conduit RF (RVPAS), with little correlation with clinical outcomes or RV function. Neo-aortic CI, ejection time, and S/D ratios also had limited correlations with outcomes or RV function, but higher post-Norwood neo-aortic CI and lower S/D ratio were correlated with better interstage survival in those with RVPAS.

• 出版日期2013-5