Hospitalisation outcomes in pneumococcal-vaccinated versus -unvaccinated patients with exacerbation of COPD: results from the HOPE COPD Study

BACKGROUND: Infectious exacerbations are crucial events that dictate the natural course of COPD patients. Pneumococcal vaccination has been shown to decrease incidence of community-acquired pneumonia in COPD patients. There is a paucity of data on outcomes of hospitalisation in pneumococcal-vaccinated COPD patients in comparison with unvaccinated subjects. The objectives of the present study were to evaluate the difference in hospitalisation outcomes in pneumococcal-vaccinated versus -unvaccinated COPD subjects hospitalised with acute exacerbation. METHODS: This was a prospective analytical study on 120 subjects hospitalised with acute COPD exacerbation. 60 patients with prior pneumococcal vaccination and 60 unvaccinated patients were recruited. Outcomes of hospitalisation such as mortality rate, need for assisted ventilation, length of hospital stay, need for intensive care unit (ICU) care and length of ICU stay were collected and compared between two groups with appropriate statistical tools. RESULTS: 60% of unvaccinated patients (36 out of 60) required assisted ventilation, whereas only 43.3% of vaccinated subjects (26 out of 60) needed assisted ventilation (p-value of 0.04). Most of the secondary outcomes were better in the vaccinated group. The mean±(SD) length of ICU stay in the vaccinated group was 0.67±1.11 days compared to 1.77±1.89 days in the unvaccinated group. The mean±(SD) length of hospital stay was 4.50±1.64 days and 5.47±2.03 days in the vaccinated and unvaccinated group, respectively (p-value of 0.005). CONCLUSIONS: COPD patients who have received prior pneumococcal vaccination have better outcomes when they are hospitalised for an acute exacerbation. Pneumococcal vaccination may be recommended for all patients with COPD who are at risk of hospitalisation with acute exacerbation.