Clinical characteristics and outcomes among pediatric patients hospitalized with pandemic influenza A/H1N1 2009 infection

• Main Authors: Eun Lee (Author), Ju-Hee Seo (Author), Hyung-Young Kim (Author), Shin Na (Author), Sung-Han Kim (Author), Ji-Won Kwon (Author), Byoung-Ju Kim (Author), Soo-Jong Hong (Author)
• Format: Book
• Published: Korean Pediatric Society, 2011-08-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 1738-1061; 2092-7258; 10.3345/kjp.2011.54.8.329
• Keywords: H1N1; Pneumonia; Children; Hospitalization; Pediatrics; RJ1-570
• Source: Korean Journal of Pediatrics, Vol 54, Iss 8, Pp 329-334 (2011)

PurposeThe purpose of this article is to describe the clinical and epidemiologic features and outcomes among children hospitalized with pandemic influenza A/H1N1 2009 infection.MethodsWe retrospectively reviewed the charts of hospitalized pediatric patients (<18 years) diagnosed with pandemic influenza A/H1N1 2009 infection by reverse-transcriptase polymerase chain reaction at a tertiary hospital in Seoul, Korea, between September 2009 and February 2010.ResultsA total of 72 children were hospitalized with pandemic influenza A/H1N1 2009 infection (median age, 6.0 years; range, 2 months to 18 years). A total of 40% had at least 1 underlying medical condition, including asthma (17%), malignancies (19%), and heart diseases (17%). Of the 72 patients, 54 (76%) children admitted with H1N1 infection showed radiographic alterations compatible with pneumonia. There was no significant difference in pre-existing conditions between pandemic influenza A/H1N1 infected patients with or without pneumonia. Children with pandemic influenza A/H1N1 pneumonia were more likely to have a lower lymphocyte ratio (P=0.02), higher platelet count (P=0.02), and higher level of serum glucose (P=0.003), and more commonly presented with dyspnea than did those without pneumonia (P=0.04).ConclusionNo significant differences in age, sex, or presence of preexisting conditions were found between children hospitalized with pandemic influenza A/H1N1 H1N1 influenza infection with pneumonia and those without pneumonia. Higher leukocyte count, higher glucose level, and a lower lymphocyte ratio were associated with the development of pandemic A/H1N1 2009 influenza pneumonia.