Abstract
Background
Neonatal renal vein thrombosis (NRVT) is a rare condition with little data available.
Methods
We retrospectively analyzed newborns diagnosed with NRVT admitted to 3 pediatric nephrology units in Paris from 2005 to 2020.
Results
Twenty-seven patients were analyzed (male = 59%). The median age at diagnosis was 2.5 days (1 – 4.5). Diagnosis was suspected based on at least one of the three cardinal signs of renal vein thrombosis in 93%: flank mass (67%), hematuria (67%) and thrombocytopenia (70%). In all patients, diagnosis was confirmed by ultrasound. All patients had at least one known perinatal risk factor. A prothrombotic risk factor was found in 13 patients (48%). NRVT was unilateral in 70%, involving the left renal vein in 58%. Among 25 treated patients, 19 (76%) received low molecular weight heparin (LMWH) as initial therapy, 2 (8%) received unfractionated heparin and 4 (16%) received fibrinolysis. Median duration of treatment was 8 weeks (4 – 12). Bleeding occurred significantly more often with fibrinolysis than with LMWH/supportive therapy (3 of 4: 75% vs 0 of 4: 0%, p = 0.05). Clot resolution in patients treated with fibrinolysis did not differ significantly from those treated with LMWH/supportive therapy. After a median follow-up of 5.7 years (3 years – 9.9 years), pathological kidney features were observed in 73% of the patients (19 of 26), kidney atrophy in 18 (69%), hypertension in 2 (8%), chronic kidney disease (CKD) in 1 (4%) and proteinuria in 2 (8%).
Conclusions
NRVT remains a challenging condition, which still requires further study because of its associated morbidity.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Ndoudi Likoho, B., Berthaud, R., Dossier, C. et al. Renal vein thrombosis in neonates: a case series of diagnosis, treatment and childhood kidney function follow-up. Pediatr Nephrol 38, 3055–3063 (2023). https://doi.org/10.1007/s00467-023-05918-w
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DOI: https://doi.org/10.1007/s00467-023-05918-w