Home » Disorders » Alzheimers » Recognize Early Signs of Alzheimer’s

Recognize Early Signs of Alzheimer’s

Future strategies to address Alzheimer’s disease hinge on the ability to improve early diagnosis.

A new report suggests cognitive abilities other than memory, including visual-spatial skills needed to perceive relationships between objects, may decline years prior to a clinical diagnosis.

“Recent studies have focused on identifying the beginning of the transition from healthy aging to dementia,” the authors write as background information in a report found in the October issue of Archives of Neurology.

“As new interventions become available, it will become important to identify the disease as early as possible.”

Key to the new research is the realization that a decline in the ability to think or learn may be an initial sign of Alzheimer’s.

That is, loss of episodic memory—remembering events in one’s life that can be explicitly stated—is commonly linked to Alzheimer’s disease, but it is not the only aspect of cognition that is affected.

David K. Johnson, Ph.D., of the University of Kansas, Lawrence, and colleagues assessed 444 individuals who did not have dementia when they were enrolled in the study, between 1979 and 2006.

Upon enrolling, each participant underwent a clinical evaluation and a psychometric assessment including tests of four cognitive factors: global cognition, verbal memory, visuospatial skill and working memory. Participants were then evaluated at least one additional time before November 2007.

Over an average followup time of 5.9 years, 134 individuals developed dementia and 310 did not; 44 with dementia died and underwent brain autopsies that confirmed a diagnosis of Alzheimer’s disease.

Using data from the psychometric assessments, the researchers constructed models to evaluate the decline in various cognitive areas before individuals were diagnosed with dementia.

“A novel finding was that visuospatial abilities demonstrated an inflection point [sudden change to a steeper slope of decline] three years before clinical diagnosis,” the authors write.

Declines in overall cognitive abilities followed in the next year, whereas inflection points for verbal and working memory were not seen until one year before clinical diagnosis. Similar results occurred only in the subgroup of individuals with Alzheimer’s disease diagnosis confirmed by autopsy.

“There are several implications of this study,” the authors conclude.

“Some of the earliest signs of preclinical disease may occur on tests of visuospatial and speeded psychomotor skills. Furthermore, the greatest rate of preclinical decline may occur on executive and attention tasks. These findings suggest that research into early detection of cognitive disorders using only episodic memory tasks, such as word lists or paragraph recall, may not be sensitive to either all of the earliest manifestations of disease or the most rapidly changing domain.”

“In summary, converging longitudinal evidence suggests that after a sharp departure from the relatively flat course of normal aging there is a preclinical period in Alzheimer’s disease with insufficient cognitive decline to warrant clinical diagnosis using conventional criteria but that can be seen with longitudinal data from multiple domains of cognition and not just memory,” they conclude.

Source: JAMA and Archives Journals

Recognize Early Signs of Alzheimer’s

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2015). Recognize Early Signs of Alzheimer’s. Psych Central. Retrieved on May 22, 2018, from https://psychcentral.com/news/2009/10/13/recognize-early-signs-of-alzheimers/8937.html

 

Scientifically Reviewed
Last updated: 6 Oct 2015
Last reviewed: By John M. Grohol, Psy.D. on 6 Oct 2015
Published on PsychCentral.com. All rights reserved.