Management of refractory chylothorax in the neonatal intensive care unit: A 22-year experience.

BACKGROUND: The aim was to assess the therapeutic strategy of patients with chylothorax in a neonatal intensive care unit. METHODS: Twenty-eight infants with chylothorax were included in this study. Their clinical characteristics and outcomes were reviewed retrospectively. RESULTS: The male-to-female ratio was 1:1. The mean gestational age and birthweight were 35.1 ± 3.5 weeks and 2,692 ± 791 g, respectively. Eighteen patients were diagnosed with congenital chylothorax; chylothorax occurred postoperatively in 10 patients. Chromosomal anomalies were diagnosed in 8 patients. Six patients received surgical therapy, such as pleurodesis, thoracic duct ligation, or lymphaticovenous anastomosis. Two patients required surgery due to resistance to pleurodesis. In surgically managed patients, the daily maximum amount of pleural effusion (mL)/bodyweight (kg) ratio was significantly larger than in non-surgically managed patients: 229.0 ± 180.5 versus 59.7 ± 49.2 mL/kg. In the receiver operating characteristic analysis of the daily maximum amount of pleural effusion/bodyweight ratio, the area under the curve was 0.889 when the cut-off value was 101 mL/kg, and the sensitivity was 0.8333 and the specificity was 0.8095 (P = 0.0059). CONCLUSIONS: Pleurodesis using OK432 could become a surgical first-line therapy for chylothorax even for neonates. It was important to initiate pleurodesis for refractory chylothorax at an earlier stage. A daily chylous effusion/bodyweight ratio of >101 mL/kg was a good predictor and seemed to be a useful parameter for prompt surgical intervention.