Pneumonia-Related Hospitalizations among the Elderly: A Retrospective Study in Northeast Italy.

Background: In both the elderly and children, pneumonia remains one of the leading causes of hospitalization. This study aimed to assess the impact of pneumonia-related hospitalizations in the population over 65 years of age in the Veneto Region. Methods: This retrospective study analyzed hospital discharge records for patients aged 65 and older who resided in the Veneto Region and had a diagnosis of pneumonia from 2007 to 2023. The hospitalizations were identified using specific ICD-9-CM codes for pneumonia as a discharge diagnosis. Hospitalization rates, mortality rates, the prevalence of complications and comorbidities, the length of stay, and associated costs were calculated by age and year. Results: From 2007 to 2023, there were 139,201 hospitalizations for pneumonia. Emergency admissions accounted for 92.1% of these cases, and only 2.0% had a specific diagnosis of pneumococcal pneumonia. The median length of stay was 10 days, and the median diagnosis-related group (DRG) tariff per hospitalization was EUR 3307. Excluding the pandemic years, the hospitalization rates remained stable at approximately 850 cases per 100,000 inhabitants before 2019. After 2022, the rates started to increase again. Overall, in the investigated period, the results showed a negative trend (average Annual Percentage Change (AAPC) of -1.931, p < 0.0001). However, when only considering the pre-pandemic years, the trend was stable, while a decline was observed starting in 2020 (AAPC of -19.697, p = 0.001). The overall discharge mortality rates ranged from 13% to 19.3% but were significantly higher in those over 85 years of age (20.6% compared with 6.5% and 12.0% in the 65-74 and 75-84 age groups, respectively). Conclusions: This study highlights the substantial burden of pneumonia in individuals over 65 years of age, showing the impacts on public health.