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[Severe iatrogenic hyponatremia in a pregnant woman].

Severe hyponatremia may be associated with several complications leading sometimes to the death of the patient. We present the case of a healthy young pregnant woman who developed a severe acute iatrogenic hyponatremia (120 mEq.l-1). The treatment of the acute dehydration due to hyperemesis gravidarum led to a dilutional hyponatremia. The causes, complications and management of severe acute hyponatremia are discussed.