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Tuesday, August 13, 2019

Common Medications Can Masquerade As Dementia In Seniors

AUGUST 13, 2019    By JUDITH GRAHAM Kaiser Health News



By all accounts the woman, in her late 60s, appeared to have severe dementia. She was largely incoherent. Her short-term memory was terrible. She couldn’t focus on questions that medical professionals asked her.
But Dr. Malaz Boustani, a professor of aging research at Indiana University School of Medicine, suspected something else might be going on. The patient was taking Benadryl for seasonal allergies, another antihistamine for itching, Seroquel (an antipsychotic medication) for mood fluctuations, as well as medications for urinary incontinence and gastrointestinal upset.
To various degrees, each of these drugs blocks an important chemical messenger in the brain, acetylcholine. Boustani thought the cumulative impact might be causing the woman’s cognitive difficulties.
He was right. Over six months, Boustani and a pharmacist took the patient off those medications and substituted alternative treatments. Miraculously, she appeared to recover completely. Her initial score on the Mini-Mental State Exam had been 11 of 30 — signifying severe dementia — and it shot up to 28, in the normal range.
An estimated 1 in 4 older adults take anticholinergic drugs — a wide-ranging class of medications used to treat allergies, insomnia, leaky bladders, diarrhea, dizziness, motion sickness, asthma, Parkinson’s disease, chronic obstructive pulmonary disease and various psychiatric disorders.
Older adults are highly susceptible to negative responses to these medications. Since 2012, anticholinergics have been featured prominently on the American Geriatrics Society Beers Criteria list of medications that are potentially inappropriate for seniors.
“The drugs that I’m most worried about in my clinic, when I need to think about what might be contributing to older patients’ memory loss or cognitive changes, are the anticholinergics,” said Dr. Rosemary Laird, a geriatrician and medical director of the Maturing Minds Clinic at AdventHealth in Winter Park, Fla.
The basics
Anticholinergic medications target acetylcholine, an important chemical messenger in the parasympathetic nervous system that dilates blood vessels and regulates muscle contractions, bodily secretions and heart rate, among other functions. In the brain, acetylcholine plays a key role in attention, concentration, and memory formation and consolidation.
Some medications have strong anticholinergic properties, others less so. Among prescription medicines with strong effects are antidepressants such as imipramine (brand name Trofanil), antihistamines such as hydroxyzine (Vistaril and Atarax), antipsychotics such as clozapine (Clozaril and FazaClo), antispasmodics such as dicyclomine (Bentyl) and drugs for urinary incontinence such as tolterodine (Detrol).
In addition to prescription medications, many common over-the-counter drugs have anticholinergic properties, including antihistamines such as Benadryl and Chlor-Trimeton and sleep aids such as Tylenol PM, Aleve PM and Nytol.
Common side effects include dizziness, confusion, drowsiness, disorientation, agitation, blurry vision, dry mouth, constipation, difficulty urinating and delirium, a sudden and acute change in consciousness.
Unfortunately, “physicians often attribute anticholinergic symptoms in elderly people to aging or age-related illness rather than the effects of drugs,” according to a research review by physicians at the Medical University of South Carolina and in Britain.
Long-term effects
In the late 1970s, researchers discovered that deficits in an enzyme that synthesizes acetylcholine were present in the brains of people with Alzheimer’s disease. Still, experts thought that the effects of anticholinergics were short-term and that if older patients stopped taking them, “that’s it — everything goes back to normal,” Boustani said.
Concerns mounted in the mid-2000s when researchers picked up signals that anticholinergic drugs could have a long-term effect, possibly leading to the death of brain neurons and the accumulation of plaques and tangles associated with neurodegeneration.
Since then several studies have noted an association between anticholinergics and a heightened risk of dementia. In late June, this risk was highlighted in a new report in JAMA Internal Medicine that examined more than 284,000 adults age 55 and older in Britain between 2004 and 2016.
The study found that more than half of these subjects had been prescribed at least one of 56 anticholinergic drugs. People who took a daily dose of a strong anticholinergic for three years had a 49% increased risk of dementia.
Preventing harm
Attention is now turning to how best to wean older adults off anticholinergics, and whether doing so might improve cognition or prevent dementia. Researchers at Indiana University’s School of Medicine hope to answer these questions in two new studies, starting this fall, supported by $6.8 million in funding from the National Institute on Aging.
One will enroll 344 older adults who are taking anticholinergics and whose cognition is mildly impaired. A pharmacist will work with these patients and their physicians to take them off the medications, and patients’ cognition will be assessed every six months for two years.
The goal is to see whether patients’ brains “get better,” said Noll Campbell, a research scientist at Indiana University’s Regenstrief Institute and an assistant professor at Purdue University’s College of Pharmacy. If so, that would constitute evidence that anticholinergic drugs cause cognitive decline.
The second trial, involving 700 older adults, will examine whether an app that educates seniors about potential harms associated with anticholinergic medications and assigns a personalized risk score for dementia induces people to initiate conversations with physicians about getting off these drugs.
Moving patients off anticholinergic drugs requires “slow tapering down of medications” over three to six months, at a minimum, according to Nagham Ailabouni, a geriatric pharmacist at the University of Washington School of Pharmacy. In most cases, good treatment alternatives are available.
http://www.virginislandsdailynews.com/common-medications-can-masquerade-as-dementia-in-seniors/article_938e249a-f728-5ca7-a9c7-2495addeae90.html

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