Older Adults Hospitalized for Pneumonia in the United States: Incidence, Epidemiology, and Outcomes.

OBJECTIVES: To define the current incidence, epidemiology, and mortality of older adult patients hospitalized with community-acquired pneumonia (CAP) in Louisville, KY and thus estimate the burden of CAP in the older adult population of the United States. To define risk factors associated with early and late outcomes. DESIGN: This was a secondary analysis of older adults (aged ≥65 years) from the University of Louisville Pneumonia Study, a prospective population-based cohort study of all hospitalized adults with CAP between June 1, 2014, and May 31, 2016. SETTING: The study took place in all nine acute care hospitals for adults in Louisville, KY. PARTICIPANTS: Residents in the city of Louisville, KY, who were diagnosed with CAP between the inclusion dates were included and who were aged 65 years or older. MEASUREMENTS: Incidence of CAP and outcomes were measured. A total of nine risk factors were also assessed for any potential association with time to clinical stability, length of stay (LOS), and mortality. RESULTS: During the 2-year study, from a Louisville population of 102 264 adults aged 65 years or older, 4760 were hospitalized with CAP. The incidence of older adults hospitalized with CAP was 2093 per 100 000 population. This corresponds to 967 470 older adults in the United States hospitalized per year with CAP. The median time to clinical stability was 2 days, and the median LOS was 6 days. The 30-day all-cause mortality was 17%. The 1-year all-cause mortality was 38% (829 patients), which corresponds to 361 982 deaths in the United States with CAP in older adults. CONCLUSION: The estimated burden of CAP in older adults is substantial in the United States. Nearly 1 million older adults are hospitalized for CAP, and over a third of those die within 1 year. J Am Geriatr Soc 68:1007-1014, 2020.

Plasma cysteine/cystine and glutathione/glutathione disulfide redox potentials in HIV and COPD patients.

Chronic obstructive pulmonary disease (COPD) is prevalent in patients infected with HIV. The purpose of this study was to test the hypothesis that systemic oxidation correlates with loss of lung function in subjects with COPD, and that HIV infection can contribute to creating such an environment. Subjects were recruited at the University of Louisville in the following groups: HIV-infected (n = 36), COPD (n = 32), HIV and COPD (n = 28), and uninfected controls with normal lung function (n = 34). HIV infection was assessed by viral load and CD4 cell counts. Pulmonary function was determined by spirometry, and plasma was collected for measurement of cysteine (Cys), cystine (CySS), glutathione (GSH) and GSH disulfide (GSSG) by HPLC followed by estimation of redox potentials (Eh) using the Nernst equation. Results showed that patients with COPD had more oxidized plasma Eh Cys/CySS than patients with normal lung function, but plasma Eh GSH/GSSG was unaltered. In addition, there was a correlation between the extent of plasma Eh Cys/CySS oxidation and loss of lung function, and this correlation remained even after correcting for age, sex, race and body mass index. HIV infection per se was not associated with increased oxidation of plasma Eh Cys/CySS, but plasma Eh Cys/CySS was more oxidized in patients with lower CD4-positve T cell counts. In patients with both HIV infection and COPD, there was a significant correlation between CD4 cell counts and lung function. Thus, systemic oxidation correlated with decreased lung function in subjects with COPD and decreased CD4 counts in subjects infected with HIV. Thus, factors contributing to plasma Eh Cys/CySS may represent novel mechanisms underlying the increased prevalence of COPD in people living with HIV.