Growing increasing frustrated when told to “stay the course” by the neurologist when I was observing continuing declines firsthand, I convinced Clare to get a second opinion ... this time with a geriatric psychiatrist affiliated with a major medical center who, by the way, requested copies of all of my logs prior to our first visit. After a lengthy interview, a review of previous tests, discussion of my logs, and comprehensive new cognitive, physical, and neurological testing at this doctor’s AD center, Clare was finally diagnosed with early onset Alzheimer’s.
I have since discovered, sadly, that many caregivers across the country can tell a very similar story ... reporting observations of AD symptoms that were misdiagnosed by their doctors and initial misdiagnoses based largely upon the MMSE or some other brief cognitive testing instrument.
Most GPs, time pressured on the best of days, are likely to use AD screening tests that can be administered quickly ... and therein lies the problem. Current popular screening tests for dementia are not particularly effective. New quick screening tests coming on the market with claims that they can be used effectively to diagnose dementia will most likely be just as ineffective as the MMSE, a cognitive screening test used for more than thirty years. However, as noted by Dr. Peter V. Rabins, Director of Geriatric Psychiatry and Neuropsychiatry at Johns Hopkins School of Medicine, whereas the MMSE can be sued to screen for cognition disorders, “The MMSE cannot be used to diagnose dementia.” Dr. Rabins further notes that, “It’s (the MMSE) limitations include its poor ability to detect minor changes in cognition – that is mild dementia – and its lack of testing for certain cognitive functions such as executive function.” (Johns Hopkins Health Alerts: Memory ... “What is the MMSE?” December, 2010.)
Researchers at Washington University/St. Louis administered a two minute questionnaire (AD8) to friends or family members (termed “informants”) of patients being screened for dementia and discovered that “informants who have regular exposure to the individual provide the most accurate assessments.” The study reported that, when comparing the AD8 results to those of the MMSE, the AD8 was found to be “superior to conventional testing in its ability to detect signs of early dementia.” It can’t tell us whether the dementia is caused by Alzheimer’s or other disorders, but it lets us know when there is a need for more extensive evaluations to answer that question.” (Galvin JE, Fagan AM, Holtzman DM, et. al, “Relationships of dementia screening tests with biomarkers of Alzheimer’s disease.” Brain, 2010: 133:3290-3300.)
This study also concluded that the MMSE is not a reliable indicator of AD symptoms because such tests “only give a ‘brief’ snapshot’ of a person’s cognitive abilities at one time ... when they are being tested.” Any caregiver knows that a person with AD can appear to be fine one moment, but definitely not fine the next moment ... just as my wife scored 29 out of a possible 30 on the MMSE in the doctor’s office on the same day that she forgot how to turn on her computer, and could not locate where we keep milk in our kitchen.
Dr. Ronald Devere, a neurologist who directs an Alzheimer’s Disease and Memory Disorders Center in Austin, Texas noted that there is one major ‘rule of thumb’ that all doctors would follow when trying to diagnose cognitive disorders: “If a person come sot a doctor with a memory or other cognitive complaints that are verified by caregivers or close friends, a complete battery or neuropsychological testing should be conducted, especially if that person’s score is in normal or mildly cognitively impaired on cognitive testing. A caregiver or close friend’s observations should always take precedence over office testing of memory and cognitive abilities such as the MMSE.” (Quoted with permission from email correspondence with Dr. Devere.)
So, please, doctors ... if caregivers share worrisome symptoms of possible dementia with you, listen to them carefully. They just may do a better job of presenting you with patients’ symptoms of dementia than any cognitive screening test will reveal.
Originally titled, "Doctors ... Please Listen to Alzheimer's Caregivers." Published in The Journal of Family Practice, May, 2011, Vol. 60, No. 05, p. 250. Access at: