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L. 'hypernatrémie, une incidence estimée entre 10 et 40 % chez les nouveau-nés de moins de 27 semaines d'aménorrhée. Notre hypothèse est que l'hypernatrémie est secondaire à une déshydratation par excès de pertes hydriques lié aux pertes insensibles. Elle devrait être plus fréquente parmi les nouveau-nés présentant une perte de poids élevée et être associée avec les différents facteurs connus augmentant les pertes insensibles : photothérapie, durée de photothérapie, et absence de corticothérapie anténatale, Nous avons mené une étude rétrospective monocentrique dans le Centre Hospitalier de Poissy

. Mots-clés, Extrême prématurité ; Natrémie ; hypernatrémie ; déshydratation ; pertes insensibles ; apports sodés ; apports hydriques