Jane W Newburger1, Lynn A Sleeper2, Peter C Frommelt2, Gail D Pearson2, William T Mahle2, Shan Chen2, Carolyn Dunbar-Masterson2, Seema Mital2, Ismee A Williams2, Nancy S Ghanayem2, Caren S Goldberg2, Jeffrey P Jacobs2, Catherine D Krawczeski2, Alan B Lewis2, Sara K Pasquali2, Christian Pizarro2, Peter J Gruber2, Andrew M Atz2, Svetlana Khaikin2, J William Gaynor2, Richard G Ohye2. 1. From the Boston Children's Hospital and Harvard Medical School, Boston, MA (J.W.N., C.D.-M.); New England Research Institutes, Watertown, MA (L.A.S., S.C.); Children's Hospital of Wisconsin and Medical College of Wisconsin, Milwaukee (P.C.F.); National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD (G.D.P.); Emory University, Atlanta, GA (W.T.M.); Hospital for Sick Children, Toronto, ON, Canada (S.M., S.K.); Morgan Stanley Children's Hospital of New York-Presbyterian, New York (I.A.W.); University of Michigan Medical School, Ann Arbor (C.S.G., R.G.O.); The Congenital Heart Institute of Florida, St. Petersburg (J.P.J.); Cincinnati Children's Medical Center, Cincinnati, OH (C.D.K.); Children's Hospital Los Angeles, Los Angeles, CA (A.B.L.); North Carolina Consortium: Duke University, Durham; East Carolina University, Greenville; Wake Forest University, Winston-Salem (S.K.P.); Nemours Cardiac Center, Wilmington, DE (C.P.); Primary Children's Medical Center and University of Utah, Salt Lake City (P.J.G.); Medical University of South Carolina, Charleston (A.M.A.); and Children's Hospital of Philadelphia and University of Pennsylvania Medical School, Philadelphia (J.W.G.). jane.newburger@cardio.chboston.org. 2. From the Boston Children's Hospital and Harvard Medical School, Boston, MA (J.W.N., C.D.-M.); New England Research Institutes, Watertown, MA (L.A.S., S.C.); Children's Hospital of Wisconsin and Medical College of Wisconsin, Milwaukee (P.C.F.); National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD (G.D.P.); Emory University, Atlanta, GA (W.T.M.); Hospital for Sick Children, Toronto, ON, Canada (S.M., S.K.); Morgan Stanley Children's Hospital of New York-Presbyterian, New York (I.A.W.); University of Michigan Medical School, Ann Arbor (C.S.G., R.G.O.); The Congenital Heart Institute of Florida, St. Petersburg (J.P.J.); Cincinnati Children's Medical Center, Cincinnati, OH (C.D.K.); Children's Hospital Los Angeles, Los Angeles, CA (A.B.L.); North Carolina Consortium: Duke University, Durham; East Carolina University, Greenville; Wake Forest University, Winston-Salem (S.K.P.); Nemours Cardiac Center, Wilmington, DE (C.P.); Primary Children's Medical Center and University of Utah, Salt Lake City (P.J.G.); Medical University of South Carolina, Charleston (A.M.A.); and Children's Hospital of Philadelphia and University of Pennsylvania Medical School, Philadelphia (J.W.G.).
Abstract
BACKGROUND: In the Single Ventricle Reconstruction (SVR) trial, 1-year transplantation-free survival was better for the Norwood procedure with right ventricle-to-pulmonary artery shunt (RVPAS) compared with a modified Blalock-Taussig shunt (MBTS). At 3 years, we compared transplantation-free survival, echocardiographic right ventricular ejection fraction, and unplanned interventions in the treatment groups. METHODS AND RESULTS: Vital status and medical history were ascertained from annual medical records, death indexes, and phone interviews. The cohort included 549 patients randomized and treated in the SVR trial. Transplantation-free survival for the RVPAS versus MBTS groups did not differ at 3 years (67% versus 61%; P=0.15) or with all available follow-up of 4.8±1.1 years (log-rank P=0.14). Pre-Fontan right ventricular ejection fraction was lower in the RVPAS group than in the MBTS group (41.7±5.1% versus 44.7±6.0%; P=0.007), and right ventricular ejection fraction deteriorated in RVPAS (P=0.004) but not MBTS (P=0.40) subjects (pre-Fontan minus 14-month mean, -3.25±8.24% versus 0.99±8.80%; P=0.009). The RVPAS versus MBTS treatment effect had nonproportional hazards (P=0.004); the hazard ratio favored the RVPAS before 5 months (hazard ratio=0.63; 95% confidence interval, 0.45-0.88) but the MBTS beyond 1 year (hazard ratio=2.22; 95% confidence interval, 1.07-4.62). By 3 years, RVPAS subjects had a higher incidence of catheter interventions (P<0.001) with an increasing HR over time (P=0.005): <5 months, 1.14 (95% confidence interval, 0.81-1.60); from 5 months to 1 year, 1.94 (95% confidence interval, 1.02-3.69); and >1 year, 2.48 (95% confidence interval, 1.28-4.80). CONCLUSIONS: By 3 years, the Norwood procedure with RVPAS compared with MBTS was no longer associated with superior transplantation-free survival. Moreover, RVPAS subjects had slightly worse right ventricular ejection fraction and underwent more catheter interventions with increasing hazard ratio over time. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00115934.
RCT Entities:
BACKGROUND: In the Single Ventricle Reconstruction (SVR) trial, 1-year transplantation-free survival was better for the Norwood procedure with right ventricle-to-pulmonary artery shunt (RVPAS) compared with a modified Blalock-Taussig shunt (MBTS). At 3 years, we compared transplantation-free survival, echocardiographic right ventricular ejection fraction, and unplanned interventions in the treatment groups. METHODS AND RESULTS: Vital status and medical history were ascertained from annual medical records, death indexes, and phone interviews. The cohort included 549 patients randomized and treated in the SVR trial. Transplantation-free survival for the RVPAS versus MBTS groups did not differ at 3 years (67% versus 61%; P=0.15) or with all available follow-up of 4.8±1.1 years (log-rank P=0.14). Pre-Fontan right ventricular ejection fraction was lower in the RVPAS group than in the MBTS group (41.7±5.1% versus 44.7±6.0%; P=0.007), and right ventricular ejection fraction deteriorated in RVPAS (P=0.004) but not MBTS (P=0.40) subjects (pre-Fontan minus 14-month mean, -3.25±8.24% versus 0.99±8.80%; P=0.009). The RVPAS versus MBTS treatment effect had nonproportional hazards (P=0.004); the hazard ratio favored the RVPAS before 5 months (hazard ratio=0.63; 95% confidence interval, 0.45-0.88) but the MBTS beyond 1 year (hazard ratio=2.22; 95% confidence interval, 1.07-4.62). By 3 years, RVPAS subjects had a higher incidence of catheter interventions (P<0.001) with an increasing HR over time (P=0.005): <5 months, 1.14 (95% confidence interval, 0.81-1.60); from 5 months to 1 year, 1.94 (95% confidence interval, 1.02-3.69); and >1 year, 2.48 (95% confidence interval, 1.28-4.80). CONCLUSIONS: By 3 years, the Norwood procedure with RVPAS compared with MBTS was no longer associated with superior transplantation-free survival. Moreover, RVPAS subjects had slightly worse right ventricular ejection fraction and underwent more catheter interventions with increasing hazard ratio over time. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00115934.
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