Analysis of the clinical characteristics of five patients with Kawasaki disease complicated with macrophage activation syndrome in Baoding Hospital of Beijing Children’s Hospital, Capital Medical University

MAS complication should be suspected in pediatric patients with KD who are non-responsive to IVIG and show signs of mental impairment, abdominal distension, scleroderma of hands and feet, or hepatosplenomegaly. We should monitor trends in blood routine, ferritin, triglyceride, fibrinogen and NK lymphocytes counts.