Can Cannabis Help Prevent Dementia?

By Pat Anson, PNN Editor

People use cannabis for a variety of reasons. Some use it to relieve pain. Others use it to help them sleep, improve their appetite, or reduce anxiety and stress. Still others use cannabis because it makes them feel good.

A new study suggests there’s another unexpected benefit from consuming cannabis, especially when it’s used recreationally: It may help middle-aged adults ward of dementia.

Researchers at SUNY Upstate Medical University looked at health survey data that assessed the subjective cognitive decline (SCD) of over 4,700 U.S. adults between the ages of 45 and 64. Memory loss and confusion are symptoms of SCD, which is considered an early sign of dementia.

To their surprise, researchers found that participants who only used cannabis recreationally had significantly lower risk of SCD – as much as 96% less risk compared to non-users. Those who used cannabis for medical reasons or combined it with recreational use also had lower odds of SCD, but the difference was not statistically significant.

“We found that non-medical cannabis use was significantly associated with reduced odds of SCD in comparison to non-users. Several factors might explain this observation. Non-medical use of cannabis often contains THC, which has a psychoactive component that creates the ‘high’ sensation. Whereas CBD is non-psychoactive and often used for anxiety and chronic pain management,” the SUNY research team recently reported in the journal Current Alzheimer Research.

One likely reason for the disparity in SCD between recreational and medical users is that those who consume cannabis for health reasons may have comorbid medical conditions – such as diabetes, hypertension, cardiovascular disease and musculoskeletal disorders -- that raise their risk of dementia.

Another consideration is sleep. One of the primary reasons people use cannabis is to help them fall asleep faster and stay asleep longer. Recreational use of cannabis has the added benefit of improving sleep quality. A recent study found that insomnia is associated with a 51% higher risk of dementia risk.

The frequency of cannabis use and whether it was smoked, vaped or ingested had no significant connection to SCD risk.

Although the study found no direct cause-and-effect relationship between cannabis, SCD and dementia, researchers think it’s worth exploring further. More than six million Americans have Alzheimer’s disease or some form of dementia, a number that’s expected to double by 2050. 

“Despite the advancement of medicine and technology, dementia remains incurable and non-preventable. While some medications can slow symptom progression, they are only effective if started during early stages and cannot reverse its course,” SUNY researchers concluded. “Given the widespread use of cannabis in the U.S., it is imperative to pursue further research to understand the mechanism underlying the reduced odds of SCD among non-medical cannabis users.”

Widespread Pain Raises Risk of Dementia and Stroke

By Pat Anson, PNN Editor

Widespread body pain caused by fibromyalgia and other chronic pain conditions raises the risk of stroke and dementia, including Alzheimer’s disease, according to a new study.

Researchers looked at health data for nearly 2,500 second generation participants in the long-running, community-based Framingham Heart Study. Participants in the “offspring” phase of the study were given a comprehensive check-up that included a physical exam, lab tests and detailed pain assessment when they enrolled in the early 1990’s. They were then reassessed every four years for signs of cognitive decline, dementia or stroke.

Over the next two decades, 188 of the participants were diagnosed with some form of dementia and 139 had a stroke.

While the number of cases was small, researchers found an association between pain and cognitive decline. Participants with widespread pain were 43% more likely to have some type of dementia, 47% more likely to have Alzheimer’s disease, and 29% more likely to have a stroke compared to those without widespread pain (WSP). 

“These findings provide convincing evidence that WSP may be a risk factor for all-cause dementia, AD dementia (Alzheimer’s), and stroke,” researchers concluded. “While it is known that chronic pain or persistent pain without detailed classification is associated with poorer cognitive performance in cross-sectional or cohort studies, our study was based on much more accurate assessments for pain at a longitudinal population level. The specific presence of WSP… has long-term implications for dementia and AD.”

The researchers said there were three possible explanations for the link between pain and cognitive decline. First are lifestyle factors associated with pain, such as reduced physical activity, poor diet, alcohol and weight gain. Second is that stress caused by widespread pain may impair cognitive function; and third is that WSP may be a “preclinical phase” of dementia and AD.

Previous studies have also linked chronic pain to dementia. A large 2017 study found that older people with chronic pain experience faster declines in memory and are more likely to develop dementia. A more recent study suggests that people with chronic pain are at higher risk of memory loss and cognitive decline if they have lower levels of education, income and access to healthcare.

Antidepressants, anti-psychotics, antihistamines and other common medications may also cause confusion and disorientation that is mistaken for dementia, especially in older adults. When patients are taken off the drugs, their cognitive function may improve.  

Previous studies have also linked widespread pain to cancer, peripheral arterial disease, cardiovascular disease and increased mortality.

Research Explores Cannabis as Treatment for MS, Alzheimer’s and Huntington’s Disease

By Pat Anson, PNN Editor

The University of Alberta is partnering with a Canadian cannabis company in three research projects exploring the use of medical cannabis for the treatment of multiple sclerosis, Alzheimer’s and Huntington’s diseases. 

Atlas Biotechnologies is investing nearly $300,000 over the next two years to fund the studies. Atlas operates a 38,000 square foot cannabis production facility near Edmonton and will supply customized blends of cannabis products to U of A researchers.

“People are touting (cannabis) for all kinds of things, but without solid scientific evidence,” said Ross Tsuyuki, PharmD, chair of the Department of Pharmacology at U of A. “But there likely are benefits for some conditions.”

The most well-known chemical compounds in cannabis are tetrahydrocannabinol (THC) and cannabidiol (CBD), but the plant has hundreds of other active biological chemicals, each with the potential of having therapeutic benefits. The goal of the research is to identify what specific compounds or combinations of compounds are effective.

“We've got to figure out the best combination of those compounds and how they're actually working in people,” Jeffrey Gossain, Atlas’ chief operating officer, told Folio, the University of Alberta's news site.  “A lot of people will tell you, 'My mom had cancer’ or, ‘My friend had an illness, and they took cannabis and it helped.’ But then for other people they don't have as effective results. 

“Part of the problem is that you don't really know what product they took, how they dosed it or the combinations of chemicals in the product that helped. It's not as simple as just saying, ‘The plant's got THC and CBD.’ You've got to get a lot more detailed than that.”

The research will examine whether CBD and other cannabinoids can relieve pain in patients with multiple sclerosis; if cannabis can reduce neuroinflammation and degeneration of the brain caused by Huntington's disease; and if cannabinoids have neuroprotective activity in models of Alzheimer’s disease.

“Alzheimer's disease, chronic pain, multiple sclerosis and Huntington's disease are all devastating conditions that don't have a lot of effective treatments,” said Tsuyuki. “If we find something, even if it works just a little, that could be an enormous advance for patients. But we have to do our homework first, and that is where we're starting.”

In addition to its partnership with the U of A, Atlas is collaborating with Harvard Medical School in developing cannabis products for pain and other neurological conditions.

A recent study found that medical cannabis is mildly effective in relieving pain and other symptoms in patients with multiple sclerosis (MS). Spanish researchers analyzed 17 clinical trials involving different combinations of THC and CBD, and found cannabis had limited effectiveness in relieving pain, muscle spasticity and bladder dysfunction.

MS is a chronic and incurable disease which attacks the body’s central nervous system, causing numbness in the limbs, difficulty walking, paralysis, loss of vision, fatigue and pain.

Chronic Pain Accelerates Dementia

By Dr. Lynn Webster, PNN Columnist

In 2017, JAMA Internal Medicine published a study that found older people with chronic pain experience faster declines in memory and are more likely to develop dementia.  While prior research had shown a link between chronic pain and brain damage, this was one of the first studies to specifically suggest that chronic pain can cause dementia.

The authors reported that people aged 60 and over with persistent pain experienced a 9.2% more rapid decline in memory score when compared to people of the same age without chronic pain. This means that people with chronic pain may experience more difficulty in managing their finances, medications and social connections.

Dementia is a chronic condition of the brain that involves memory, personality and judgment. It is not a disease; it is a symptom of one or more diseases.

There are many types of dementia. Alzheimer’s disease is considered to be the most common.

Dementia usually worsens over time if the underlying disease remains static or progresses, as is the case with many chronic pain conditions.

There are an estimated 20 million Americans with high impact (the most severe) chronic pain who may be experiencing accelerated decline in cognition due to their pain. The amount of dementia appears to be associated with the severity and duration of chronic pain. Undertreated or untreated chronic pain may accelerate dementia.

Chronic pain affects an even larger percentage of elderly adults (one in three) than the general population. Since the prevalence of chronic pain increases with age, the probability of experiencing dementia increases as well. However, the reasons for that go beyond aging itself.

Seniors are more likely to take multiple medications that can contribute to mental confusion. On average, elderly people take five or more prescriptions. They may also use over-the-counter medications, which adds to potential drug-associated mental compromise.

Opioids, in particular, have been implicated in cognitive impairment. However, a study published in 2016 suggests there is no difference in cognitive decline between people on opioids and those on nonsteroidal anti-inflammatory drugs. The study's implication is that pain, not opioids, leads to cognitive impairment.

Brain Fog

Chronic pain appears to affect the function and structure of the hippocampus. This is the region of the brain that involves learning, memory, and emotional processing.

One explanation for the mental decline associated with chronic pain is that various areas of the brain compete for attention. Attentional impairment compromises memory by diverting attention to the areas of the brain processing pain. In effect, the brain is multi-tasking and favoring the processing of pain over cognition. This may, in part, explain the clinical phrase “brain fog.”

The Australian Broadcasting Company's "All in the Mind" website explains that pain damages the brain in several ways, including a change in the size of the thalamus and a decrease in the amount of a neurotransmitter (gamma-aminobutyric acid) the brain produces. In other words, chronic pain changes the brain structurally and functionally.

The prefrontal cortex is the part of the brain responsible for executive functions, such as cognition, social behavior, personality, and decision-making. It is also the part of the brain that modulates pain.

According to "All in the Mind," some researchers believe that chronic pain decreases the volume of the prefrontal cortex. Over time, brains damaged by pain lose the ability to handle pain — along with some of the personality attributes that make us who we are.

Brain Damage Can Be Reversed

The good news is that the brain damage caused by chronic pain can be reversed, at least to some extent. Unfortunately, the elderly are less likely to recover from dementia caused by chronic pain as compared with younger patients.

If pain is adequately treated, the brain may be able to regain its ability to function normally. A 2009 study of patients with chronic pain due to hip osteoarthritis showed reversal of brain changes when their pain was adequately treated. 

People who don’t have their acute pain managed are more likely to develop chronic pain. It is postulated that the changes in the brain that occur with chronic pain begin with the onset of acute pain. There is also some evidence that an individual’s genes may influence who is at greatest risk for developing brain damage from chronic pain and who is least likely to recover from it. 

Many people have criticized the concept of assessing pain as the 5th vital sign, and have called it a contributing factor for the opioid crisis. As I have said, pain may not be a vital sign, but it is vital that we assess it. Asking patients about their pain is critical to providing interventions that can mitigate the consequences of undertreated pain, including dementia. 

Lynn R. Webster, MD, is a vice president of scientific affairs for PRA Health Sciences and consults with the pharmaceutical industry. He is author of the award-winning book, The Painful Truth,” and co-producer of the documentary,It Hurts Until You Die.” You can find him on Twitter: @LynnRWebsterMD. 

The information in this column is for informational purposes only and represents the author’s opinions alone. It does not inherently express or reflect the views, opinions and/or positions of Pain News Network.

Chronic Pain Causes Brains to Age More Rapidly

By Pat Anson, PNN Editor

Poorly treated or untreated chronic pain can lead to a number of other health problems, from high blood pressure and insomnia to depression and anxiety.

Now there is evidence that chronic pain also causes brains to age more rapidly, raising the risk of developing Alzheimer’s disease and other neurological problems associated with aging.

“Our findings highlight the need to address chronic pain, not just in older individuals but in potentially everyone, as pain may have unintended consequences in the brain that we don’t yet fully understand,” said lead author Yenisel Cruz-Almeida, PhD, a researcher at the University of Florida Institute on Aging.

Over a three-year period, Cruz-Almeida and her colleagues used magnetic resonance imaging (MRI) to measure the volume of gray and white matter in the brains of 47 older adults, ages 60 to 83.  The volunteers were free of neurological disorders and in generally good health, although 33 of them had some type of chronic pain.

Volunteers who did not have chronic pain had brains that appeared four years younger than their actual age.

Chronic pain sufferers had brains that appeared an average of two years older. They were also more likely to have greater pain intensity, have a “less agreeable personality” and be less emotionally stable, according to researchers.

The University of Florida produced this video on the study, which was recently published online in the journal Pain.

“Not everybody ages the same way,” said Cruz-Almeida. “I don’t want people to think, ‘Oh, I have chronic pain. I’m doomed.’ This is not the case. That is not the message we want to get out. There is more nuance than that.”

Interestingly, the volunteers who reported getting pain treatment in the last three months had younger-appearing brains compared to those that did not, suggesting that pain relief slows brain aging. Pain sufferers who had a happier outlook on life and were generally more upbeat also had younger-appearing brains.

“The pain experience is not just in your brain,” said Cruz-Almeida. “There appear to be avenues or things that could be done to change brain age.

“Our findings also suggest that both pain treatments and psychological traits may significantly mitigate the effect of pain on the aging brain and could further decrease the risk of age-related deterioration and death.”

Cruz-Almeida is planning additional research with a larger sample of older adults that will look at ways to alleviate accelerated brain aging.

Benzos May Increase Dementia Risk

By Pat Anson, Editor

Anti-anxiety drugs often prescribed to chronic pain patients increase the risk of dementia and Alzheimer's disease when used long term, according to clinicians with the American College of Osteopathic Neurologists and Psychiatrists.

Benzodiazepines --  also known as benzos -- include brand name prescription drugs such as Valium, Ativan, Klonopin and Xanax. They were approved by the U.S. Food and Drug Administration to treat psychiatric conditions, but are also prescribed "off label" to treat bipolar disorder, insomnia, post traumatic stress disorder, and chronic pain.

A Canadian study of 9,000 patients found those who had taken a benzodiazepine for three months or less had about the same dementia risk as those who had never taken one.

But taking benzos for three to six months raised the risk of developing Alzheimer's by 32 percent, and taking them for more than six months boosted the risk by 84 percent.

Similar results were found by French researchers studying more than 1,000 elderly patients.

"Current research is extremely clear and physicians need to partner with their patients to move them into therapies, like anti-depressants, that are proven to be safer and more effective," saidHelene Alphonso, DO, Director of Osteopathic Medical Education at North Texas University Health Science Center in Fort Worth.

The case for limiting the use of benzodiazepines is particularly strong for patients 65 and older, who are more susceptible to falls, injuries, accidental overdose and death when taking the drugs. The American Geriatric Society in 2012 labeled the drugs "inappropriate" for treating insomnia, agitation or delirium because of those risks.

"It's imperative to transition older patients because we're seeing a very strong correlation between use of benzodiazepines and development of Alzheimer's disease and other dementias. While correlation certainly isn't causation, there's ample reason to avoid this class of drugs as a first-line therapy," said Alphonso.

In its draft guidelines for the prescribing of opioid pain medication, the Centers for Disease Control and Prevention (CDC) recommends that opioids and benzodiazepines not be prescribed concurrently whenever possible. A CDC study found that about 80% of unintentional overdose deaths associated with opioids also involved benzodiazepines. Nearly 6,500 people died from overdoses involving benzodiazepines in 2010.

Opioids, benzodiazepines and muscle relaxants are all central nervous system depressants. Mixing the drugs is potentially dangerous because their interaction can slow breathing and raise the risk of an overdose death.

In a study of over 35,000 patient visits for acute and chronic pain, recently published in the journal Pharmacoepidemiology and Drug Safety,  researchers found that the prescribing of benzodiazepines was three to four times more likely when opioids were also prescribed.

Over a third of the patients prescribed opioids for chronic musculoskeletal pain were given a sedative. And patients with a history of psychiatric and substance abuse disorders were even more likely to be co-prescribed opioids and sedatives.

"Multi drug use is the trailing edge of the opioid epidemic," said Mark Sullivan, MD, a professor of psychiatry and behavioral sciences at the University of Washington School of Medicine. "We are making progress on decreasing opioid prescribing, but co-prescribing of opioids and sedatives has not decreased.

"Patients who are on long-term combined opioid and benzodiazepine therapy are often on a treadmill. They feel relief when they take their medications and withdrawal when they stop, so they continue this combined therapy, even though many function poorly and some will die as a result."

Over 50,000 visits to emergency rooms in 2011 involved a combination of benzodiazepines and opioids, according to the Substance Abuse and Mental Health Services Administration (SAMHSA)