Pacemaker therapy in the elderly and very elderly: comorbidity-burden vs age, as prognostic factors for excess of length of in-hospital stay, complications and mortality

Abstract Background The number of elderly patients undergoing pacemaker (PM) implantation is constantly growing. However, information on survival and prognostic factors of this particular patient group is scarce. Recent studies suggest that comorbidity burden may have an equal, if not greater, effect on length of in-hospital stay (LOS), complications and mortality, as age in a variety of clinical scenarios. Objective The objective of this study was to determine the survival of elderly and very elderly patients undergoing PM implantation, as well as to investigate the impact of comorbidities, as compared to age, on excess of length of in-hospital stay and mortality. Methods This is a retrospective observational study of a single centre. Patients that underwent (both elective and non-elective) PM implantation between June 2016 and December 2018 in our centre, were included for chart review. Elderly patients were defined as those with age 80–89 years, whereas very elderly patients were defined as those with ≥90 years of age. Excess in LOS was defined as an in-hospital stay >3 days. Results A total of 507 patients were included in the study with a mean age of 80.6 (±8.5) years. 255 elderly and 60 very elderly patients were included. Median follow-up time was 24 months. Baseline clinical characteristics are presented in Table 1. The mortality rate for elderly patients was 18.8% for the elderly and 36.7% for the very elderly (p=0.002). The presence of ≥2 comorbidities (defined in Table 1) resulted to be a significant predictor for the excess of LOS, whereas age did not significantly predict excess of LOS (HR: 7.1 (4.4–11.4), p<0.001); HR: 1.01 (0.9–1.1), p=0.56, respectively). Neither age, nor comorbidity burden predicted the appearance of device related complications. Both comorbidites and age predicted mortality. However, the association was stronger for the presence of comorbidites, than for age (HR: 1.9 (1.1–3.1), p=0.002 vs HR: 1.1 (1.1–1.2), p<0.001, respectively). Elderly patients with low comorbidity burden (<2 comorbidities) showed no significant differences with regards to LOS and mortality when compared to younger patients (2 (2–4) vs 3 (2–5) days, p=0.529 and 18.3% vs 17.4%, p=0.702; respectively). Conclusions Our study shows a good life expectancy of elderly and very elderly patients, that underwent PM implantation, with a survival rate that is comparable to the general population. Comorbidity burden, rather than age, significantly predicts excess of LOS and should therefore be the driving factor in the approach of patients undergoing new PM implantation. Funding Acknowledgement Type of funding sources: None.