US researchers examining nearly 20,000 people aged 45 and over found that those with high diastolic blood pressure were more likely to have cognitive impairment, where thinking and memory ability is reduced, than people with normal diastolic pressure. The study was the work of first author Dr Georgios Tsivgoulis, of the University of Alabama at Birmingham, and colleagues, and is published in the 25 August print issue of Neurology.