Fluctuating Blood Pressure: A Warning Sign for Dementia and Heart Disease
Published:31 Oct.2023 Source:University of South Australia
A new study by Australian researchers has shown that fluctuating blood pressure can increase the risk of dementia and vascular problems in older people, short blood pressure (BP) fluctuations within 24 hours as well as over several days or weeks are linked with impaired cognition.
To help explore the mechanisms that link BP fluctuations with dementia, UniSA researchers recruited 70 healthy older adults aged 60-80 years, with no signs of dementia or cognitive impairment. Their blood pressure was monitored, they completed a cognitive test, and their arterial stiffness in the brain and arteries was measured using transcranial doppler sonography and pulse wave analysis.
The researchers found that higher blood pressure variability within a day, as well as across days, was linked with reduced cognitive performance, and higher blood pressure variations within the systolic BP were linked with higher blood vessel stiffness in the arteries.These results indicate that the different types of BP variability likely reflect different underlying biological mechanisms, and that systolic and diastolic blood pressure variation are both important for cognitive functioning in older adults. The links were present in older adults without any clinically relevant cognitive impairment, meaning that BP variability could potentially serve as an early clinical marker or treatment target for cognitive impairment.