Background:Infants with CHD who undergo cardiopulmonary bypass surgery are at risk of impaired growth and neurodevelopment. However, few studies have thoroughly investigated the risk factors for growth and neurodevelopmental impairments, particularly with respect to the timing of the initial surgical intervention.

Methods:We retrospectively analysed term singleton infants with CHD who underwent cardiopulmonary bypass surgery at a Japanese tertiary centre between 2015 and 2021. Neurodevelopment was assessed at 18–22 months of age using the Kyoto Scale of Psychological Development. We compared outcomes by CHD type (univentricular [UV] vs. biventricular [BV]) and analysed risk factors for growth impairment (weight and height < tenth percentile) and neurodevelopmental impairment (developmental quotient [DQ] < 85), including birth weight, sex, the type of CHD (UV or BV), and timing of the initial cardiopulmonary bypass surgery (<28 days or ≥28 days).

Results:Of the 108 eligible children, 29 had UV physiology and 79 had BV physiology. Both groups showed impaired growth, with significantly lower body weights in the UV group. Neurodevelopmental scores (total DQ) were significantly lower in the UV group. Neurodevelopmental impairment (total DQ < 85) was observed in 44/108 (40.7%) children, and after adjustment, UV repair was significantly associated with neurodevelopmental impairment (adjusted odds ratio [OR] 3.11, 95% confidence interval [CI] 1.27–7.65). Timing of the initial cardiopulmonary bypass surgery was not associated with outcomes.

Conclusion:Infants with CHD in Japan exhibit impaired growth and neurodevelopment at 18–22 months following cardiopulmonary bypass surgery, especially those with UV physiology.