AbstractBackgroundRecent efforts have focused on optimising interstage outcomes, including growth, for infants following the Norwood operation. The impact of the site of interstage care remains unclear, and it has been hypothesised that care at the surgical site may be beneficial due to greater access to resources such as nutritional support. This study evaluated the relationship between site of interstage care and weight gain in a large multicentre cohort.MethodsInfants enrolled in the

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... Paediatric Cardiology Quality Improvement Collaborative (2008–2013) surviving up to Stage 2 were included. Change in weight-for-age z-score between Norwood discharge and Stage 2 admission was compared in those receiving care at the surgical versus non-surgical site.ResultsOf the 487 interstage survivors, 60% received all care at the surgical site, and 40% received care at a non-surgical site. There was no significant difference between groups in change in weight-for-age z-score: +0.36±0.96 for the surgical site group versus +0.46±1.02 for the non-surgical site group, p=0.3. Results were unchanged in multivariable analysis adjusting for differences in important baseline characteristics, duration of interstage, and home surveillance strategy. The proportion of all patients with weight-for-age z-score <−2 decreased from 40% at Norwood discharge to 29% at Stage 2, with no significant difference in change between the two groups (p=0.1).ConclusionsThe site of interstage care was not associated with weight gain during the interstage period. Nearly one-third of patients overall had a weight-for-age z-score <−2 at Stage 2. Further study is required to identify methods to optimise weight gain in these patients.