Frailty Modifies the Relationship Between High BP and Dementia Risk in Older Adults

The impact of late-life high blood pressure (BP) on dementia risk appears to depend on an older adult’s level of frailty, with high BP increasing dementia risk in robust individuals but not in those who are prefrail or frail. In this US prospective analysis of 5,093 dementia-free participants aged 67–89 years from the Atherosclerosis Risk in Communities Neurocognitive Study (ARIC-NCS), researchers followed participants for a median of 11 years and identified 1,189 new cases of dementia. Among robust older adults with no frailty characteristics, high BP (defined as BP ≥130/80 mm Hg or use of antihypertensive medication) was associated with a 39% higher risk of dementia compared with normal BP (HR 1.39). In contrast, among participants who were prefrail or frail, high BP was associated with an 18% lower relative risk of dementia (HR 0.82), while elevated BP below the high BP threshold was associated with a significantly lower risk (HR 0.68). There was a significant interaction between BP and frailty status, suggesting that physiological changes associated with aging and frailty may alter the relationship between BP and brain health. Unlike high BP, diabetes and current smoking consistently increased dementia risk regardless of frailty status. These findings indicate that a “one-size-fits-all” approach to BP management in older adults may not be optimal and that functional status should be considered when evaluating vascular risk factors and strategies to preserve cognitive health. Source: https://www.neurology.org/