National Survey of Influenza Myocarditis in Japanese Children in Three SeasonsAkira Ukimura1,2*, Kanta Kishi3, Tomoyuki Yamada2, Yuriko Shibata2, Yukimasa Ooi1,2, Yumiko Kanzaki1 and Hiroshi Tamai3
- *Corresponding Author:
- Akira Ukimura
Department of General Internal Medicine
Osaka Medical College, 2-7 Daigaku-machi
Takatsuki 569-8686, Japan
Received date: February 21, 2014; Accepted date: April 15, 2014; Published date: April 20, 2014
Citation: Ukimura A, Kishi K, Yamada T, Shibata Y, Ooi Y, et al. (2014) National Survey of Influenza Myocarditis in Japanese Children in Three Seasons. Clin Microbial 3:143. doi: 10.4172/2327-5073.1000143
Copyright: © 2014 Ukimura A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
An Influenza pandemic occurred in 2009. A nationwide, retrospective survey of Influenza myocarditis in Japanese children in 3 consecutive Influenza seasons was performed to compare Influenza myocarditis in the 2009/2010 season (the pandemic season), the 2010/2011 season, and the 2011/2012 season, by mailing questionnaires to 514 hospitals in Japan that have pediatric departments and collecting data from 285 hospitals. A questionnaire-based survey related to Influenza myocarditis was also conducted to evaluate the attitudes of Japanese pediatricians concerning the diagnosis of Influenza myocarditis. Fifteen Influenza myocarditis patients were reported, with 8 (H1N1pdm:6, type A:1, type B:1) from the 2009/10 season, 4 (type A:1, type B:3) from the 2010/11 season, and 3 (type B:3) from the 2011/12 season. Only 8 patients with Influenza A virus myocarditis were reported, with 7 patients from the 2009/2010 season, one from the 2010/2011 season, and none in the 2011/2012 season. Mortality was 33.3% (5/15) among the myocarditis patients. Twelve patients (12/15, 80%) were diagnosed with fulminant myocarditis with fatal arrhythmias and/or cardiogenic shock. In the pediatricians’ attitude survey, only 3.3% of pediatricians routinely examined the electrocardiograms of children hospitalized with Influenza infection in Japan. The number of Japanese children with myocarditis associated with Influenza A virus seemed to increase in the pandemic season. Increased awareness of Influenza myocarditis in children is needed during future Influenza pandemics.