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Is withdrawal of nocturnal hyperhydration possible in children with primary hyperoxaluria treated with RNAi?

Primary hyperoxaluria type 1 is a rare genetic disorder caused by bi-allelic pathogenic variants in the AGXT gene leading to an overproduction of oxalate which accumulates in the kidneys in the form of calcium oxalate crystals. Thus, patients may present with recurrent nephrocalcinosis and lithiasis, with progressive impairment of the  renal function and eventually kidney failure.  There is no specific treatment besides liver-kidney transplantation, and pre-transplantation management by 24 h-hyperhydration, crystallisation inhibitors and high-dose pyridoxine has a high negative impact on quality of life, especially because of the discomfort due to nocturnal hyperhydration. Since 2020, lumasiran, an RNA-interfering therapy, has been approved for the treatment of primary hyperoxaluria type 1 in adults and children. However, to date, there are no recommendations regarding the discontinuation of other supportive measures during RNAi therapy. In this report, we present two patients with primary hyperoxaluria type 1 who were treated with lumasiran and stopped nocturnal hyperhydration with positive outcomes, i.e. normal urinary oxalate, absence of crystalluria, stable kidney function and improved well-being. These data suggest that discontinuing nocturnal hydration may be safe in children responding to lumasiran, and may have a positive impact on their quality of life. Additional data are needed to update treatment recommendations.

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