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Alzheimer's is often a disease that is not recognized until it is too late for its victims and their families to make preparations for long-term care. A new, simple, non-invasive test may enable early detection of this devastating disease.

Dementia of any kind is a devastating diagnosis both for the patient and for family and friends. In most of the industrialized world, the most common form of dementia is Alzheimer's disease, which has been identified in 5.4 million people in the United States alone, over 200,000 of them under the age of 65. Epidemiologists expect that 11 to 15 million Americans could be in care for the disease by 2050. 

Alzheimer's disease is no less common in other countries. Researchers have found that French women who carry three out of four genes specific to Alzheimer's have a 35 percent risk of developing the condition by age 85, and those who carry four out of four genes for the disease have a 68 percent risk. Even in places like China, Korea, India, and Nigeria, Alzheimer's is commonly diagnosed in people as young as 40.

Alzheimer's is not curable. No one ever recovers from it. It would seem to be the kind of thing that you would just rather not know you are destined to face. However, there are some good reasons that the disease should be recognized as soon as possible, such as these:
  • Even though Alzheimer's disease is not curable, it is somewhat treatable. The sooner patients are diagnosed, the sooner they can get treatments that may slow down the progression of the disease and keep them communicative and active longer.
  • Families and other caretakers need time to prepare for long-term care. A pronouncement that a loved one cannot return home after a hospitalization, that he or she has to be put into long-term care immediately and will never go home, isn't just devastating to the patient. It is also devastating to the family. Even the most basic nursing home care, in the United States, will cost $1,000 a week or more. This has to be paid by the patient or the patient's family in cash, unless the patient goes on Medicaid. Every state has a Medicaid program for Alzheimer's patients, but no state allows the patient and the patient's spouse to retain more than $3,000 in non-exempt assets. Otherwise, savings, retirement plans, investments, cars, second homes, and even furniture may have to go, not just for the patient, but for the husband or wife of the patient. Alzheimer's patients who receive Medicaid in the USA cannot even retain savings for a decent funeral and burial. There are things that can be done to lighten these burdens with a few (usually three or four) years to prepare.
  • Resources for dealing with Alzheimer's are available, but families and patients in crisis mode cannot usually find them. An American friend of mine had to put his father into a nursing home after an infection greatly accelerated the course of his dementia. His father did not have a clear power of attorney, in fact, he had two contradictory powers of attorney. His father did not have a clear advanced directive. He had filled out multiple advanced directives. This made it impossible for my friend to access social services and counselors and at-home care to keep his father at home just a little bit longer, and the father died just six weeks after being placed in a nursing home. 
Time to prepare for Alzheimer's makes a huge difference. PET scans of the brain can be used to identify the disease, but a new "spit test" is faster, cheaper, and easier.

Using Saliva To Test For Alzheimer's

Scientists have learned that the body's chemistry, reflecting the brain's chemistry, begins to change as much as 20 years before the onset of Alzheimer's. The disease itself almost always involves the formation of long tangles of twisted proteins that "strangle" neurons, but decades before the formation of plaque in the brain, as many as 6,000 different kinds of abnormal protein begin to be produced. 
 
A research team at the University of Alberta, in Canada, has discovered that some of these abnormal proteins can be detected in saliva.
 
 
The researchers took saliva samples from 35 elderly volunteers who have normal cognition, 25 volunteers who suffered mild cognitive impairment or "pre-Alzheimer's," and 22 patients who had the full-blown disease. They used a a collection of techniques known as salivary metabolonomics to look for biomarkers, unusual proteins, that would be found in different quantities in the three groups. Then they confirmed their results with another group of 27 patients, using saliva sample analyses to predict cognitive state.
 
Very preliminary results show that easily identified proteins in saliva indicate whether a person is not on the way to having Alzheimer's, is experiencing metabolic changes that will lead to the full symptoms of the disease, or already has it. While the research team needs to replicate its results to make sure that some fluke influence accounts for their results, it is highly likely that a simple saliva test for the disease will be available in five to ten years. What can you do in the meantime?
 
Here are ten indications that someone may be highly likely to develop Alzheimer's disease:
 
  1. Challenges in planning or solving problems. Not remembering to pay the bills, to keep appointments, or how to accomplish familiar tests is an early warning sign of dementia.
  2. Loss of executive function, the ability to make good decisions. Many people in the early stages of dementia give or spend money inappropriately, or enter inappropriate relationships. Of course, people who are not suffering dementia may make choices of which their families do not approve.
  3. Memory loss interferes with daily life. Not being abile to remember where you parked the car, or where you put the keys, or how to knot a tie or to tie one's shoes may be signs of cognitive decline.
  4. Confusion regarding time and place. Failure to recognize the day of the week (driving to a church that meets on Sunday on a Saturday, for example) or familiar surroundings (not knowing where one is) are early warning signs.
  5. Difficulty interpreting images. A person in cognitive decline may misidentify television personalities or even family members by sight.
  6. New problems with reading, writing, or spelling. An American friend of mine tells the story of a person who interpreted the advertising slogan "Got milk?" as "Goat milk?"
  7. Changes in mood or personality. As people recognize their cognitive abilities are failing, they may not know whom to trust. They may become suspicious, defensive, and irritable.
  8. Misplacing things. Losing everyday objects is a common problem in the early stages of Alzheimer's.
  9. Inability to trace steps. People who have pre-Alzheimer's easily get lost in new locations.
  10. Innumeracy. People who have early-stage dementia often lose their ability to add and subtract, and to understand the meanings of numbers, for instance, whether $1000 is a little or a lot of money or whether 1000 calories is a small or large serving.
Early treatment leads to better outcomes. Recruiting all the help you can get as soon as you can get it leads to a happier life for a longer time even though cure is not possible.
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