Comparison of clinical characteristics and performance of pneumonia severity score and CURB-65 among younger adults, elderly and very old subjects

Jung Hsiang Chen, Shy Shin Chang, Jason J. Liu, Rai Chi Chan, Jiunn Yih Wu, Wei Chuan Wang, Si Huei Lee, Chien Chang Lee

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

Background: Age-related alterations in the clinical characteristics and performance of severity scoring systems for community-acquired pneumonia (CAP) are unknown. Methods: Consecutive patients with CAP presenting to the emergency department were prospectively studied. Patients were classified as younger adults (age 18-64 years), elderly (age 65-84 years) and very old subjects (age ≥85 years). Clinical characteristics, complications, outcomes and validity of the pneumonia severity index (PSI) and CURB-65 categories were compared across these three age categories. Results: Analysis involved 348 (35.3%) younger adult patients, 438 (44.3%) elderly patients and 201 (20.0%) very old patients. Compared with younger adults, elderly and very old patients had a higher burden of comorbidities and a higher incidence of CAP-related complications. The 30-day mortality rate was 5.2% in younger adults, 7.1% in elderly patients and 9.5% in very old patients. The area under the ROC curve (AUCs) for PSI were 0.87 (95% CI 0.77 to 0.97), 0.85 (95% CI 0.803 to 0.897) and 0.69 (95% CI 0.597 to 0.787) and the AUCs for CURB-65 were 0.80 (95% CI 0.67 to 0.93), 0.73 (95% CI 0.65 to 0.82) and 0.60 (95% CI 0.47 to 0.73) in the younger adult, elderly and very old patients, respectively. A modified PSI or CURB-65 excluding the age variable increased the AUC in most age categories. There was no significant effect of age on 30-day mortality after adjusting for other PSI or CURB-65 variables. Conclusion: Elderly patients with CAP have more atypical clinical manifestations and worse outcomes. The underperformance of the PSI in elderly patients may be due to the inappropriate weight given to the age variable. A modification of the cut-off point for PSI or CURB-65 to define severe pneumonia may improve the score performance in elderly patients.

Original languageEnglish
Pages (from-to)971-977
Number of pages7
JournalThorax
Volume65
Issue number11
DOIs
Publication statusPublished - Jan 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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