Doctors Warn of Dangerous Complication in Toddler After Flu Infection

A two-year-old girl, with no prior medical conditions, was hospitalized in the pediatric intensive care unit at Shaare Zedek Medical Center due to a rare and life-threatening complication of the influenza virus. The incident began when the toddler suffered from a high fever and multiple vomiting episodes at home for a day. Due to a significant lack of appetite, she started drinking very large amounts of water. Her condition rapidly deteriorated when she began having seizures, prompting an urgent transfer to the pediatric emergency department, where she tested positive for the flu virus. Medical evaluation revealed that although the child had received all routine vaccinations, she had not been vaccinated against the flu this season. The medical team, led by Dr. Harel Munish, a specializing physician, diagnosed the toddler with SIADH syndrome, a condition where the body secretes an excessive amount of ADH hormone (antidiuretic hormone). "The hormone's role is to regulate the amount of water the kidneys return to the body," explained Dr. Weizler. "In this situation, with the hormone being secreted excessively, the kidneys reabsorb too much water instead of excreting it as urine. This leads to a significant increase in body water relative to sodium levels, causing hyponatremia, or low blood sodium. This drop led to seizures, a severe symptom of the syndrome that can be life-threatening without treatment." Dr. Weizler emphasized a counterintuitive medical point: "Precisely in these situations, treatment requires limiting fluid intake to reduce excess water in the body, after ruling out other causes like dehydration." After intensive treatment in the ICU, her condition showed significant improvement. Dr. Amir Zilka, a senior physician in the unit, reported that "the child's condition is now stable and improving. We sometimes encounter SIADH syndrome as a complication of the flu, but the severity in this case is rare." Hospitals are using this unusual case to warn parents as winter peaks. "The need for an annual flu vaccination each year is challenging, but it is the best protection we have against the disease, which can lead to severe and even life-threatening damage," stressed Dr. Zilka. Meanwhile, there is an increase in winter illnesses: currently, ten flu patients are hospitalized at Shaare Zedek, three of whom are in inpatient wards and intensive care units. This is the highest number of inpatients recorded at the medical center since the beginning of the season.