Frailty and blood pressure in older adults: rethinking risk and treatment strategies

Management of hypertension in older adults is becoming increasingly important with population aging. Although randomized controlled trials consistently demonstrate that blood pressure (BP) lowering reduces cardiovascular events across age groups, observational studies in older populations report paradoxical associations, with lower BP levels linked to higher mortality. These divergent findings raise fundamental questions regarding the interpretation and clinical significance of BP in later life. Emerging evidence suggests that the prognostic value of BP changes with aging. Longitudinal studies show that BP trajectories typically shift from a progressive increase in midlife to a decline in late life, a pattern that persists largely independent of antihypertensive treatment. Notably, both lower BP levels and late-life BP decline are consistently associated with functional deterioration, frailty, and increased mortality. Frailty, characterized by reduced physiological reserve and increased vulnerability to stressors, provides a critical framework for interpreting these observations. Accumulating evidence indicates that frailty modifies the relationship between BP and clinical outcomes, attenuating or even reversing associations observed in non-frail populations. We propose a conceptual shift in which BP in older adults is viewed not solely as a modifiable cardiovascular risk factor, but also as an integrative biomarker reflecting proximity to functional decline and mortality. This framework may help reconcile the discrepancies between randomized trial data and observational findings, and supports a more individualized, physiology-informed approach to managing hypertension that incorporates frailty assessment. The conventional association between BP and adverse outcomes (left and center) and the conceptual framework proposed in this study (right). In the conventional model, higher BP is associated with an increased risk of adverse events (left). In older adults, a J-shaped relationship is observed between BP and adverse events, with increased all-cause mortality observed at lower BP levels (center). We propose that, in older adults, BP should be interpreted not only as a modifiable risk factor but as a physiological signal reflecting underlying health status. The clinical significance of a given BP value differs depending on frailty status. In frail individuals, declining BP may indicate reduced physiological reserve and proximity to functional decline and mortality. Accordingly, BP should be interpreted in the broader clinical context and not in isolation.