Head Drop and Flaccid Weakness in Infantile Nephrotic Syndrome.

Dropped head syndrome (DHS) is a relatively rare condition, with a broad differential diagnosis. We report here a case of infantile nephrotic syndrome with DHS caused by severe hypokalemia. Electrocardiogram showed flat T- and U-waves. Multiple factors including recurrent diarrhea, prolonged diuretic and corticosteroid use, hypomagnesemia, poor intake, and malnutrition caused hypokalemia in the case. Head drop and flaccid weakness resolved completely after potassium and magnesium supplementation. Potassium levels should be monitored and corrected promptly in these settings.