Navigating a Complex Presentation: Management of Hypernatremic Dehydration, Acute Kidney Injury, Hyperkalemia, and Metabolic Acidosis in a Patient With Down Syndrome: A Case Report

应对复杂病情：唐氏综合征患者高钠血症性脱水、急性肾损伤、高钾血症和代谢性酸中毒的管理：病例报告