Comparative analysis of clinical scores in predicting ICU and hospital mortality in nonagenarians and centenarians after in-hospital cardiac arrest: a retrospective observational study using the Australian and New Zealand Intensive Care Society (ANZICS) Adult Patient Database (2010-2024)

CONCLUSIONS: In the oldest critically ill patients following IHCA, physiologic severity scores, particularly APACHE III and SOFA, outperform frailty in predicting short-term mortality and resource use. These findings support the integration of validated scoring systems into early clinical decision-making to improve care precision and guide resource allocation in ageing ICU populations.