A new study published in the medical journal Neurology suggests that impaired kidney function is a risk factor for cognitive decline in old age. The study, conducted by researchers at Rush University Medical Center, found that poor kidney function was linked specifically with cognition related to memory functions. Damage to one of these functions, episodic memory, which retrieves memories of time, place, associated emotions and other contextual knowledge, is often the earliest sign of Alzheimer’s disease. "Given the dearth of modifiable risk factors for age-related cognitive decline, these results have important public health implications," said Dr. Aron Buchman, a neuroscientist in the Rush Alzheimer’s Disease Center. "Further work to understand the link between kidney function and the brain may provide new strategies for preventing memory loss in elders." Dr. Buchman said the findings suggest that there are common disease processes that affect both the brain and the kidneys in the elderly, and hypothesized that underlying vascular problems, such as diabetes and hypertension, may account for the association between kidney problems and cognitive decline. The rate of decline in cognition was equivalent to that of a person seven years older at baseline, Buchman said.