Treatment of Kawasaki syndrome: A comparison of two dosage regimens of intravenously administered immune globulin

Because intravenously administered immune globulin (IVIG) is effective in reducing the incidence of coronary artery aneurysms in Kawasaki syndrome when given at a dose of 400 mg/kg daily for 4 days, we undertook a multicenter clinical trial comparing two dosage regimens of IVIG. Patients were randomly assigned to receive IVIG at either 400 mg/kg daily for 4 days (22 patients) or 1 gm/kg as a single dose (22 patients). All patients received aspirin therapy, and all were enrolled within 7 days of onset of fever. The presence of coronary artery aneurysms was evaluated by means of two-dimensional echocardiography before infusion; at days 4 to 6, 14 to 21, and 42 to 49 after infusion; and at 1 year. Coronary artery aneurysms were detected in 3 of the 44 patients, including one patient receiving 400 mg/kg and two patients receiving 1 gm/kg (p value not significant). No giant aneurysms were detected. No major side effects occurred with either dosage regimen. Patients receiving the 1 gm/kg dose had a faster resolution of fever and were discharged from the hospital approximately 1 day sooner than the 400 mg/kg group (p=0.01). Although the relatively small sample size in this trial does not allow for a more definitive statement regarding the occurrence of coronary artery aneurysms, it appears that the 1 gm/kg dose is associated with a more rapid clinical improvement and a shorter hospital stay.