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Ritei Uehara, MD; Mayumi Yashiro; Yosikazu Nakamura, MD, MPH; Hiroshi Yanagawa, MD

Arch Pediatr Adolesc Med. 2004;158:1166-1169.

Objective  To observe the clinical characteristics of patients with Kawasaki disease whose parent also had the same disorder.

Design  Cross-sectional study using the data from nationwide surveys of Kawasaki disease in Japan.

Setting  All hospitals with a bed capacity of 100 or more and pediatric departments in Japan.

Patients  All patients described on the 16th and 17th surveys covering the 4-year period from January 1, 1999, through December 31, 2002.

Main Outcome Measures  We compared clinical details, including sibling case, recurrence, diagnosis, administration of intravenous immunoglobulin, and coronary abnormalities, between patients whose parents had Kawasaki disease and patients with no parental history of Kawasaki disease. We also observed age at onset and sex of affected parent-offspring pairs with Kawasaki disease confirmed by using the data of previous nationwide surveys.

Results  The odds for having sibling cases were significantly increased among patients whose parents also had Kawasaki disease (odds ratio, 6.94; 95% confidence interval, 2.77-17.38). Patients with parental Kawasaki disease were more likely to experience recurrent Kawasaki disease, receive additional administration of intravenous immunoglobulin, and experience coronary abnormalities at 1 month after onset. Among confirmed parent-offspring pairs with Kawasaki disease, the mean age at onset of offspring was younger than that of their parents (25.6 vs 41.8 months), despite the lack of statistical significance.

Conclusions  Some cases of Kawasaki disease show familial susceptibility to the disorder. Family history, especially parental history of Kawasaki disease, may be an indicator of disease severity.

Author Affiliations: Department of Public Health, Jichi Medical School, Tochigi (Drs Uehara and Nakamura and Ms Yashiro), and Saitama Prefectural University, Saitama (Dr Yanagawa), Japan.

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