Characteristics of Kawasaki Disease Before and After the COVID-19 Pandemic in a Large Pediatric Heart Disease Center.

Background: Kawasaki disease (KD) is an acute febrile systemic vasculitis of unknown etiology. After the pandemic of coronavirus disease 2019 (COVID-19), some children infected by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) showed clinical symptoms similar to KD, indicating a close relationship between KD and SARS-CoV-2. Therefore, we designed this retrospective study to analyze the characteristics of KD patients before and after the COVID-19 pandemic. Methods: We retrospectively collected demographic and laboratory data of KD patients in Yuying Children's Hospital of Wenzhou Medical University from 1 January 2015 to 31 December 2020. Yuying Children's Hospital of Wenzhou Medical University is located in eastern China and is the largest pediatric heart disease center in the region, which includes a population of nearly 10 million. We studied the characteristics of KD patients and analyzed the changes in these characteristics before and after the emergence of SARS-CoV-2 in this area. Results: The analysis revealed the following novel features: (1) Under the influence of the COVID-19 pandemic, the onset age of Kawasaki disease became younger. (2) After the occurrence of COVID-19, the hospitalization days of KD patients were shorter than before the pandemic. (3) After the occurrence of COVID-19, the albumin of KD patients was higher than before the pandemic. (4) The COVID-19 pandemic did not have a significant effect on the incidence of coronary artery lesions (CALs) in Kawasaki disease. Conclusion: After the COVID-19 outbreak, the characteristics of KD patients showed a younger trend of age, shorter hospitalization days and higher levels of albumin, but the incidence of CALs did not change significantly.

Factors affecting the duration of coronary artery lesions in patients with the Kawasaki disease: a retrospective cohort study.

BACKGROUND: Coronary artery lesions (CALs) are the most severe complication of Kawasaki disease (KD). Approximately 9-20% of the patients with KD develop CAL despite receiving regular treatment (intravenous immunoglobulin [IVIG] and aspirin). Some patients develop coronary aneurysms, leading to coronary artery stenosis or thrombosis, resulting in ischaemic heart disease and significantly affect the patients' lives. The purpose of this study was to investigate the factors associated with the duration of CAL in patients with KD. METHODS: The data of 464 patients with KD and CAL admitted to the Children's Heart Centre, The Second Affiliated Hospital and Yuying Children's Hospital from 2010 to 2018 were retrospectively analysed. Demographic and clinical information and echocardiographic follow-up data were collected. Kaplan-Meier curves were used to estimate the overall CAL duration, and the log-rank test was used to compare statistical differences. Univariate and multivariate Cox regression models were used to identify variables related to the CAL duration. RESULTS: The median CAL duration was 46 days (95% confidence interval: 41-54 days). CALs were observed in 61.5, 41.5, 33.3, 22.3, 10.3, and 7.7% of the patients at 1 month, 2 months, 3 months, 6 months, 1 year, and 2 years after the onset of KD, respectively. Univariate Cox regression model showed that sex (p = 0.016), rash symptoms (p = 0.035), delayed IVIG treatment (p = 0.022), CAL type (p < 0.001), degree of CAL (p < 0.001), white blood cell count before IVIG treatment (p = 0.019), and platelet count after IVIG treatment (p = 0.003) were statistically significant factors associated with the overall CAL duration. Multivariable Cox regression showed that delayed IVIG treatment (p = 0.020), multiple dilatations (p < 0.001), a greater degree of dilatation (p < 0.001), and higher platelet count after IVIG treatment (p = 0.007) were positively related to CAL duration. CONCLUSIONS: CAL duration was affected by delayed IVIG treatment, type of CAL, degree of CAL, and platelet count after IVIG treatment. These factors should be monitored carefully during the follow-up and management of patients with KD and CAL.

Effect of different doses of aspirin on the prognosis of Kawasaki disease.

BACKGROUND: Kawasaki disease (KD) is the leading cause of acquired heart disease in children, and is steadily increasing in prevalence in East Asia. KD is often complicated by coronary artery damage, including dilatation and/or aneurysms. Aspirin is used with intravenous immunoglobulin (IVIG) to prevent coronary artery abnormalities in KD. However, the role and optimal dose of aspirin remain controversial. Identifying the dose of aspirin in the acute phase will facilitate development of a more appropriate treatment strategy in improving the outcome of KD. METHODS: A total of 2369 patients with KD were retrospectively analyzed and divided into three groups according to the aspirin dose: 510 in group 1 (20-29 mg/kg/day), 1487 in group 2 (30-39 mg/kg/day), and 372 in group 3 (40-50 mg/kg/day). The differences in laboratory data, rate of IVIG resistance and coronary artery damage were compared among the groups. RESULTS: There was no difference in the incidence of coronary artery aneurysms (CAAs) in group 1 compared with groups 2 and 3 (2 weeks of illness: 2.94% vs. 1.90% vs. 3.36%; 3-4 weeks of illness: 1.94% vs. 2.32% vs. 2.65%). The risk for developing CAA was not reduced at 2 weeks of illness onset in groups 2 and 3 compared with group 1 (adjusted OR = 1.05, 95% confidence interval: 0.34-3.18; aOR = 1.81, 95% CI: 0.42-7.83). Furthermore, the risk for developing CAA was not reduced at 3-4 weeks of illness onset in groups 2 and 3 (aOR = 2.63, 95% CI: 0.61-11.28; aOR = 0.52, 95% CI: 0.03-9.54). There was no significant difference in the rate of IVIG resistance among the groups. Platelet levels after IVIG treatment in group 1 were significantly lower than those in groups 2 and 3 (522.29 × 109/L, 544.69 × 109/L, and 557.77 × 109/L, p = 0.013). C reactive protein of the 30-40 mg/kg*day group was slightly higher than the other two groups. (7.76, 8.00, and 7.01 mg/L, p = 0.028). CONCLUSIONS: Aspirin at the dose of 20-29 mg/kg/day dose not increase the risk of coronary artery damage and IVIG resistance compared with the dose of 30-50 mg/kg/day. This low dose may have a lower risk for a potential effect on liver function.