Prediction of intravenous immunoglobulin resistance in patients with Kawasaki disease according to the duration of illness prior to treatment

Risk factors predicting intravenous immunoglobulin (IVIG) resistance in patients with Kawasaki disease (KD) were assessed according to the duration of illness prior to treatment. Of 555 KD patients included between 2008 and 2014, 362 were IVIG responders (65.2%) and 193 were IVIG non-responders (34.8%). The risk of IVIG resistance was inversely correlated with the duration of illness prior to treatment. Neutrophil dominance (>= 80%) was significantly higher in IVIG non-responders regardless of the duration of pre-IVIG illness. While there were no differences between IVIG responders and non-responders who were diagnosed at < 3 days, increasing platelet count and decreasing liver enzyme levels were seen over time in IVIG responders, but not in IVIG non-responders. Multivariable analysis showed that, in addition to neutrophil levels >= 80%, risk factors for IVIG resistance were age <= 12 months for patients who were diagnosed at <= 3 days, and platelet count <= 300 x 10(3)/mu L and aspartate aminotransferase level >= 100 IU/L for patients who were diagnosed at >= 6 days. Conclusion: Predictors of IVIG resistance in patients with KD differ according to the duration of pre-treatment illness. Risk assessment according to the duration of illness may improve the prediction of IVIG resistance.