Host Factors and Biomarkers Associated with Poor Outcomes in Adults with Invasive Pneumococcal Disease |
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| Authors: | Shigeo Hanada Satoshi Iwata Kazuma Kishi Miyuki Morozumi Naoko Chiba Takeaki Wajima Misako Takata Kimiko Ubukata The Invasive Pneumococcal Diseases Surveillance Study Group |
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| Institution: | 1Department of Respiratory Medicine, Respiratory Center, Toranomon Hospital, Tokyo, Japan;2Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan;3Okinaka Memorial Institute for Medical Research, Tokyo, Japan;4Department of Microbiology, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan;University of Leicester, UNITED KINGDOM |
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| Abstract: | BackgroundInvasive pneumococcal disease (IPD) causes considerable morbidity and mortality. We aimed to identify host factors and biomarkers associated with poor outcomes in adult patients with IPD in Japan, which has a rapidly-aging population.MethodsIn a large-scale surveillance study of 506 Japanese adults with IPD, we investigated the role of host factors, disease severity, biomarkers based on clinical laboratory data, treatment regimens, and bacterial factors on 28-day mortality.ResultsOverall mortality was 24.1%, and the mortality rate increased from 10.0% in patients aged ˂50 years to 33.1% in patients aged ≥80 years. Disease severity also increased 28-day mortality, from 12.5% among patients with bacteraemia without sepsis to 35.0% in patients with severe sepsis and 56.9% with septic shock. The death rate within 48 hours after admission was high at 54.9%. Risk factors for mortality identified by multivariate analysis were as follows: white blood cell (WBC) count <4000 cells/μL (odds ratio OR], 6.9; 95% confidence interval CI], 3.7–12.8, p < .001); age ≥80 years (OR, 6.5; 95% CI, 2.0–21.6, p = .002); serum creatinine ≥2.0 mg/dL (OR, 4.5; 95% CI, 2.5–8.1, p < .001); underlying liver disease (OR, 3.5; 95% CI, 1.6–7.8, p = .002); mechanical ventilation (OR, 3.0; 95% CI, 1.7–5.6, p < .001); and lactate dehydrogenase ≥300 IU/L (OR, 2.4; 95% CI, 1.4–4.0, p = .001). Pneumococcal serotype and drug resistance were not associated with poor outcomes.ConclusionsHost factors, disease severity, and biomarkers, especially WBC counts and serum creatinine, were more important determinants of mortality than bacterial factors. |
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