Abstract
Thromboembolism is being detected at increasing rates in pediatric tertiary care hospitals. The incidence of pediatric thrombophilia differs across countries, and is unknown in Japan. We sent a survey to 520 pediatric department heads and 629 specialists, requesting details on patients who developed symptomatic thromboembolism between 2006 and 2010. Of 280 eligible cases, congenital thrombophilia and other conditions were reported. Congenital thrombophilia (n = 54, 19.3 %) comprised defects in protein C (27), protein S (9), and antithrombin (7). None had mutations in factor V Leiden or prothrombin G20210A, both of which are frequent in Caucasians. Non-congenital causes of thrombophilia included congenital heart disease, the use of central venous catheters, nephrotic syndrome, antiphospholipid syndrome, and malignancy with or without use of L-asparaginase. Patients with congenital thrombophilia developed thromboembolism at a significantly younger age (median 1.0 vs. 5.0 years, p = 0.014), had a higher frequency of consanguinity (35.2 vs. 1.8 %, p < 0.001) and post-thrombotic syndromes (29.6 vs. 13.3 %, p = 0.007) than those who did not. Thromboembolism in children with congenital thrombophilia recurred more frequently (50.0 vs. 13.7 %, p < 0.001) and was associated with more sequelae (61.1 vs. 37.2 %, p = 0.009) than in children without congenital thrombophilia. This nationwide survey provides the first comprehensive study of Japanese children with symptomatic thromboembolism. Significant recurrence and sequelae require optimized standards.
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Acknowledgments
AI, MT, and MS contributed to the conception and design of this study; NM performed the statistical analyses; AI and CC drafted the manuscript; and HN and AM critically reviewed the manuscript and supervised the whole study process. All authors read and approved the final manuscript. This survey was supported by a grant from the NCCHD (22-3). Authors are grateful to the study participants and clinicians involved in this study. We thank Dr. Julian Tang in the Department of Education for Clinical Research, NCCHD for his editorial support.
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Ishiguro, A., Ezinne, C.C., Michihata, N. et al. Pediatric thromboembolism: a national survey in Japan. Int J Hematol 105, 52–58 (2017). https://doi.org/10.1007/s12185-016-2079-y
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DOI: https://doi.org/10.1007/s12185-016-2079-y