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ORIGINAL RESEARCH article

Front. Neurol., 06 April 2021 | https://doi.org/10.3389/fneur.2021.627712

Association Between Kawasaki Disease and Childhood Epilepsy: A Nationwide Cohort Study in Taiwan

Chien-Heng Lin1,2, Jung-Nien Lai3,4, Inn-Chi Lee5, I-Ching Chou6,7, Wei-De Lin8, Mei-Chen Lin9,10 and Syuan-Yu Hong6*
  • 1Division of Pediatrics Pulmonology, China Medical University, Children's Hospital, Taichung, Taiwan
  • 2Department of Biomedical Imaging and Radiological Science, College of Medicine, China Medical University, Taichung, Taiwan
  • 3School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan
  • 4Department of Chinese Medicine, China Medical University Hospital, Taichung, Taiwan
  • 5Department of Pediatrics, School of Medicine, Chung Shan Medical University Hospital and Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
  • 6Division of Pediatrics Neurology, China Medical University, Children's Hospital, Taichung, Taiwan
  • 7College of Chinese Medicine, Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan
  • 8Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
  • 9Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
  • 10College of Medicine, China Medical University, Taichung, Taiwan

Background: Kawasaki disease is a common vasculitis of childhood in East Asia. The complications following Kawasaki disease mostly included cardiovascular sequelae; non-cardiac complications have been reported but less studied. This study investigated potential epilepsy following Kawasaki disease in Taiwanese children.

Objectives: Through National Health Insurance Research Database, we retrospectively analyzed the data of children aged <18 years with clinically diagnosed Kawasaki disease from January 1, 2000 to December 31, 2012 in Taiwan. These patients were followed up to estimate the incidence of epilepsy in the Kawasaki cohort in comparison with that in the non-Kawasaki cohort in Taiwan.

Results: A total of 8,463 and 33,872 patients in the Kawasaki and non-Kawasaki cohorts were included in the study, respectively. Of the total eligible study subjects, 61.1% were boys and 38.9% were girls; most patients with newly diagnosed Kawasaki disease were aged <5 years [88.1%]. Patients with Kawasaki disease showed a higher incidence rate [47.98 vs. 27.45 every 100,000 person years] and significantly higher risk [adjusted hazard ratio = 1.66, 95% confidence interval = 1.13–2.44] of epilepsy than those without the disease. Additionally, female sex [adjusted hazard ratio = 2.30, 95% confidence interval = 1.31–4.04] and age <5 years [adjusted hazard ratio = 1.82, 95% confidence interval = 1.22–2.72] showed a significantly higher risk of epilepsy in the Kawasaki cohort.

Conclusion: Results revealed a higher incidence rate and significant risk of epilepsy in Taiwanese children with Kawasaki disease than in those without the disease. Therefore, children diagnosed with Kawasaki disease are recommended follow-up as they have a high risk of epilepsy and seizure disorders.

Background

Kawasaki disease [KWD], also known as mucocutaneous lymph node syndrome, has long been considered a common childhood vasculitis disorder with various cardiovascular complications, most commonly involving medium-sized muscular arteries (1). Additionally, non-cardiac complications followed by KWD has aroused interest during the past few decades (2). Despite neurological complications involving the central nervous system (CNS) not being uncommon in KWD, the extent of their influence on the brains of children and the effect of KWD on the development of various neurodevelopmental disorders (NDD) remains unclear (3). Although neurological complications such as seizures, hemiplegia, facial palsy, cerebral vasculitis, myositis, and aseptic meningitis have been occasionally reported in conjunction with KWD, the long-term sequelae such as epilepsy have never been reported (47).

In precedence to the present study, our research team conducted a study in 2019 that included 612 children with KWD. The results of a long-term follow-up indicated that these children had an increased risk of developing a neurodevelopmental disorder (NDD) with KWD. Although not all of the children developed an NDD, the prevalence was statistically significant for epilepsy and Tourette syndrome (8). Here, we conducted a wide-ranging investigation in the child population by using Taiwan National Health Insurance Research Database [NHIRD] to determine whether an association exists between KWD and childhood epilepsy.

Methods

Data Source

National Health Insurance program [Taiwan NHI] was established in 1995 and enrolled >99.9% of the population in Taiwan. NHIRD was established by Taiwan NHI and consisted of information on outpatients, hospitalization, medical treatment or operation, and other medical services of patients' each hospital visit. To conduct this study analysis, we used a population-based inpatient file based on NHIRD. The identification number was encrypted before the database was released to protect the privacy of each study subject. Diagnoses in Taiwan NHI are coded according to the International Classification of Disease, Ninth Revision, Clinical Modification [ICD-9-CM]. The Research Ethics Committee of China Medical University and Hospital in Taiwan approved the study [CMUH-104-REC2-115-R4].

Study Population

To clarify the association between KWD [ICD-9-CM: 446.1] and epilepsy [ICD-9-CM: 345, A225], we identified two cohorts: Kawasaki and non-Kawasaki cohorts. Patients who were newly diagnosed as having KWD from 2000 to 2012 were classified into the Kawasaki cohort, and the diagnosis date was set as the index date; patients without any KWD diagnosis were classified into the non-Kawasaki cohort. Patients ever diagnosed as having epilepsy before the index date, with incomplete demographic factors, >18 years old, who died, or who withdrew from the NHI program or due date to December 31, 2012 were excluded from this study. Each patient in the Kawasaki cohort was 1:4 propensity matched based on age [every 5-year span], sex, index year, urbanization, and parent occupation (Figure 1). To avoid wrongly diagnosing acute seizures as epilepsy during the KWD course, the gain of diagnosis with epilepsy was separated from the admission course of KWD for at least 1 month.

FIGURE 1
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Figure 1. The flowchart of study population selection.

Statistical Analysis

We used two sample t-tests for age and chi-square test for sex, urbanization, and parent occupation to compare the difference between Kawasaki and non-Kawasaki cohorts. The Kaplan–Meier method was used to demonstrate the cumulative incidence of epilepsy and cerebrovascular diseases between two cohorts, and the log rank test was applied to estimate the difference between the two curves.

To calculate epilepsy risk between Kawasaki and the comparison cohorts, we used a Cox proportional-hazard model and presented hazard ratios, adjusted hazard ratios [aHRs], and 95% confidence intervals [CIs] before and after adjusting demographic factors. The significance criterion was set at <0.05 for two-side testing of p-value. All statistical analyses were performed using SAS statistical software, version 9.4 [SAS Institute Inc., Cary, NC, USA]; the cumulative incidence curve was plotted using R software.

Results

We eventually enrolled 8,463 and 33,872 patients in the Kawasaki and non-Kawasaki cohorts. There were no statistically significant differences in urbanization level, geographic region, head injury, parents' occupation (all p > 0.05) (Table 1), respectively. Of the total eligible study subjects, 61.1% were boys and the other 38.9% were girls; most patients were newly diagnosed as having KWD at age ≤5 years [88.1%], and the mean age was 2.4 years. Table 2 presents the number, incidence rate, and epilepsy risk in the Kawasaki and non-Kawasaki cohorts. Patients with KWD showed a higher incidence rate [47.98 vs. 27.45 every 100,000 person years] and significantly higher risk [aHR = 1.66, 95% CI = 1.13–2.44] of epilepsy. Other potential risk factors such as sex, increasing age, and urbanization had a non-significant effect on epilepsy risk. To confirm the association between KWD and epilepsy, a multivariable stratified analysis was performed. Female sex [aHR = 2.30, 95% CI = 1.31–4.04] and age <5 years [aHR = 1.82, 95% CI = 1.22–2.72] showed a significantly higher risk of epilepsy in the Kawasaki cohort (Table 3). After stratification, patients with a follow-up period of 5 years after KWD diagnosis had a significantly higher risk of epilepsy [aHR = 1.82, 95% CI = 1.17–2.82] than those with a follow-up period of >5 years (Table 4). Patients with KWD had a significantly higher cumulative incidence of epilepsy [p = 0.0032] than did those without KWD (Figure 2).

TABLE 1
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Table 1. Demographic characteristics of patients with Kawasaki disease in Taiwan during 2000–2012.

TABLE 2
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Table 2. Cox model measured hazard ratio and 95% confidence intervals of epilepsy associated with and without Kawasaki disease.

TABLE 3
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Table 3. Incidence rates, hazard ratio and confidence intervals of epilepsy in different stratification.

TABLE 4
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Table 4. Incidence rates, hazard ratio, and confidence intervals of epilepsy in different follow-up stratification.

FIGURE 2
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Figure 2. Kaplan–Meier for cumulative incidence of epilepsy under aged stratified by Kawasaki disease with log-rank test.

Discussion

As early as 1977, Nakane et al. reported a case of mucocutaneous lymph node syndrome complicated by acute occlusion of the right middle cerebral artery and hemiconvulsion–hemiplegia–epilepsy syndrome. Since then, numerous neurological involvements associated with KWD have been discovered (9). These include headache, convulsions, somnolence, irritability, meningoencephalit5is, ptosis, sensorineural hearing loss, and facial palsy (4, 6, 7). Even so, most of them subsided completely following the successful management of KWD without any clinically apparent signs of CNS injury. However, few studies have examined whether acute KWD is followed by subtle but clinically apparent changes in the brain of children, which might lead to the long-term development of NDDs (47). Therefore, the present study adopted a larger nationwide database to trace the incidence of epilepsy in Taiwanese children with KWD. In the present study, we demonstrated that children with KWD experience epilepsy later in life. The trend was independent of sex, age at KWD diagnosis, and urbanization.

Additionally, our results revealed that children aged <5 years with KWD had a higher risk of epilepsy. We hypothesize that from birth to age 5 years, a child's brain develops more than at any other time in life (10), and KWD, a vasculitis that occurs most often in early childhood, may interfere with brain development and probably subtly alter the structure of human brain, causing epilepsy (11). Although no reports refer to alterations of the brain structure of children following KWD, and our cohort observation study failed to provide evidence of such alterations, we presumed the involvement of a mechanism and pathogenesis comparable to those of central nervous system vasculitis, in which brain vessel wall inflammation can result in intraluminal stenosis and platelet adhesion to the vessel wall, eventually leading to a substantial brain parenchymal lesion and the development of seizure disorders (12, 13). We also determined that epileptogenesis largely occurred within 5 years of KWD diagnosis. Although no existing reports explain it, we speculated that such would be the case, with time for secondary injury processes (such as neuroinflammation) following KWD to occur (14, 15). A similar phenomenon occurs in epileptogenesis after traumatic brain injury (16). However, more evidence derived from neuroimaging studies and animal brain models is necessary to validate our hypothesis.

This study revealed that female patients with KWD had a higher risk of epilepsy than did male patients, but the reason underlying these finding remains unclear. One argument is that women have stronger immune responses to infection and inflammation than men do (17). In addition, sex hormones play a crucial role in immune system activities (18). Women undergo endocrinological changes two to three times in their lifetime [puberty, childbearing, breastfeeding, and menopause], and each hormone's transition results in a significant effect on the immune system, rendering female patients with an underlying autoimmune disease susceptible to associated complications (19, 20). This theory was studied in systemic lupus erythematosus—a well-known autoimmune disease (21). However, because the present study's patients were young children (due to the nature of KWD), the aforementioned assumption regarding endocrinological changes, which is suitable for people who are adolescents or older, may not be applicable here. Perhaps hormones present only in boys (e.g., testosterone) played a role in our results. Because testosterone has been proven to play roles in the inhibition of vascular inflammation, neuroinflammation, and aneurysm formation (2226), its possible role in the inhibition of brain inflammation associated with KWD would be another area worth studying.

Nonetheless, previous studies have suggested that early brain insult might alter the brains of boys and girls differently but lead to the development of NDDs later in life (27). For example, autism spectrum disorder and attention-deficit/hyperactivity disorder are more likely to be diagnosed in boys (28, 29). A study in the rat model, using lipopolysaccharide as a stimulator of the innate immune system, examined blood–brain barrier dysfunction under inflammatory conditions. It was found that following lipopolysaccharide stimulation, females had higher levels of cytokines and chemokines in the blood and brain compared with males. Hence, although females have a stronger capability to resist infections, females may have an exacerbated inflammatory response compared with males when presented with the same dose of an immune stimulus (30). Further research is required to confirm whether the same theory can be applied in female patients with epilepsy following KWD.

In addition to epilepsy, some long-term behavioral problems, including somatic problems and withdrawal trait, have been noted in children following KWD (Table 5) (8, 3137), but the conclusions are conflicting (37). Separately, the role of brain-reactive autoantibodies has been studied in brain development and cognitive impairment from many different autoimmune conditions and autoimmune encephalitis (3841), Likewise, some autoantibodies were studied in relation to KWD, including antithyroid microsomal antibody, antiparietal cell antibody, antiliver kidney microsomal antibody, antiendothelial cell antibodies, antinuclear antibody, antineutrophil cytoplasmic antibody, antimitochondrial antibody, and antismooth muscle antibody. These autoantibodies likely develop in children with KWD during the acute stage and may persist for many years (42, 43). However, whether these autoantibodies increase the risk of autoimmune disease in the future is unclear, although some studies have explored the association between them (44, 45). Furthermore, epilepsy after KWD is another problem, and whether epilepsy after KWD shares a common mechanism as seizure occurring in the acute stage of vasculitis during KWD or any other autoimmune encephalitis remains unclear and intrigues us. If such is the case, two hypotheses may be explained. First, some autoantibodies triggered by KWD could persist in vivo for years, which in turn leads to some autoantibody-mediated diseases or systemic autoimmune diseases so that seizure disorders or epilepsy could only be sentinel disorders of these diseases (46, 47). Second, given that medium-sized vessel vasculitis is the bedrock of KWD, it is reasonable to infer that human brain, an organ rich in vessels, is subject to cryptogenic changes in structures, which contribute to epilepsy later in life (4850). Although none has been proven, both are possible. Future studies are encouraged to investigate these assumptions.

TABLE 5
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Table 5. Literature search and article analysis for neurodevelopmental disorders in children with KWD.

This study has some limitations. First, we were unable to preclude some confounding factors, including pharmacological treatment of children with KWD, KWD severities, and other genetic and environmental risk factors associated with KWD. Second, the diagnoses of epilepsy and KWD in this study were derived based on the ICD-9-CM code. Although it is a powerful tool for disease categorization, it lacks scientific validation. Third, although a retrospective cohort study is an effective approach to enrolling numerous individuals and discovering hidden medical phenomenon over a long time period and from a broad perspective, the approach cannot explore underlying mechanisms or pathogeneses of diseases. Hence, this study might serve as a pilot study attracting public attention and further research. The recommended methods are (1) randomized control trials to provide more rigorous conclusions with appropriate control of confounders such as the pharmacological treatment of KWD and KWD severity; and (2) animal model–based studies to clarify the pathogenesis of epilepsy following KWD.

Conclusions

The results of this study revealed that KWD in childhood might be a potential risk factor for childhood epilepsy. Therefore, the brain development of children diagnosed as having KWD should be carefully followed up using neuroimaging to monitor for the development of epilepsy, especially within the 5 years after KWD diagnosis. A massive randomized control trial and a detailed, structured animal cell model containing different cofounders are necessary in future.

Data Availability Statement

The data analyzed in this study is subject to the following licenses/restrictions: The analysis was generated by the national health insurance database, which was safeguarded and was only accessed by a strict application process. Requests to access these datasets should be directed to Mei-Chen Lin, coolindm@gmail.com.

Author Contributions

S-YH collected the data, analyzed the data, and prepared the initial draft of the manuscript. I-CL and C-HL took part in designing the study and wrote the final draft of the manuscript. The statistics for the study were compiled by J-NL, W-DL, M-CL, and I-CC, who also took part in the editing process and the revision of the tables. All of the authors read and approved of the final manuscript.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

We wish to express our appreciation to the Taiwan Ministry of Health and Welfare Clinical Trial Center [MOHW109-TDU-B-212-114004], MOST Clinical Trial Consortium for Stroke [MOST Clinical Trial Consortium for Stroke (MOST 109-2321-B-039-002)], Tseng-Lien Lin Foundation, Taichung, Taiwan, and the China Medical University Hospital Medical Research Department [#DMR-108-199, #DMR-109-042, and #DMR-108-043] for giving assistance to this work.

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Keywords: Kawasaki disease, children, epilepsy, seizure, risk

Citation: Lin C-H, Lai J-N, Lee I-C, Chou I-C, Lin W-D, Lin M-C and Hong S-Y (2021) Association Between Kawasaki Disease and Childhood Epilepsy: A Nationwide Cohort Study in Taiwan. Front. Neurol. 12:627712. doi: 10.3389/fneur.2021.627712

Received: 17 November 2020; Accepted: 10 March 2021;
Published: 06 April 2021.

Edited by:

Kette D. Valente, Universidade de São Paulo, Brazil

Reviewed by:

Felippe Borlot, Alberta Children's Hospital, Canada
Kuo-Liang Chiang, Kuang Tien General Hospital, Taiwan

Copyright © 2021 Lin, Lai, Lee, Chou, Lin, Lin and Hong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Syuan-Yu Hong, dazingdog@hotmail.com