Our patient went into shock on the seventh day of the course of the disease (systolic pressure 20% lower than normal for her age), accompanied by elevated neutrophil percentage, CRP, severe hypoproteinemia, hyponatremia, valvular regurgitation, elevated N-terminal pro-natriuretic peptide and cTn-I, coronary artery ectasia, and resistance to IVIG, which suggested a KDSS. This evidence concerns the gene TNNI3 and Hyponatremia.