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Analgesia

By Irish Pharmacist - 03rd Feb 2020

Treatment of pain a challenge in Alzheimer’s disease

Finding the best course of treatment to alleviate pain in people with Alzheimer’s disease (AD) is a complex and multifaceted issue. One recent contribution to increasing the understanding of the bigger picture around AD, pain and painkillers is a PhD thesis by Researcher Mr Aleksi Hamina, MSc (Pharm) at the University of Eastern Finland. Using data from nationwide healthcare registers, he studied the use of opioids and other painkillers in more than 70,000 people diagnosed with AD in Finland.

“Treating pain in older adults is a massively important issue, which will become even more important in the near future. Analgesics are very widely used, but the evidence on their harms and benefits is not as strong as we would hope for. This goes even more for people with cognitive disorders, such as AD, and there really isn’t enough research on how and which analgesics are being used,” he added.

Pain is commonly reported by older people, regardless of whether they have Alzheimer’s or not. However, AD makes things more complicated, as there are frequent problems in communication and people may express their pain through behavioural and psychiatric symptoms. Indeed, antipsychotics, anti-anxiety drugs and sleep-inducing drugs are often prescribed to people with AD, sometimes in response to their symptoms of pain.

“We found that when people with AD were prescribed an opioid analgesic, use of antipsychotics and benzodiazepine drugs began to decrease. This could indicate better management of their pain, although it is impossible to know for certain from the data we used,” Prof Hamina pointed out.

People with Alzheimer’s disease are prescribed an opioid almost as frequently as people without AD. There are, however, differences in how opioids are used. Pills are often replaced by opioid skin patches, whose effect can last up to several days. Long-term use is also common in people with AD: Once an opioid is started, more than 30 per cent continue using them for six months or more.

“Long-term use of opioids can be problematic, as adverse effects may occur. In any case, regular assessment of pain and opioid use is important in all patients, those with and without cognitive disorders alike,” Prof Hamina said.

It was also found that while opioids may alleviate pain and other possible pain-induced symptoms in people with AD, they also increase the risk of pneumonia by around 30 per cent. Strong opioids such as oxycodone and fentanyl increase the risk most, but an increased risk was also found among those using buprenorphine, tramadol or codeine.

“Opioids weaken the cough reflex and increase sedation, possibly explaining the increased risk of pneumonia,” said Prof Hamina. “On one hand, pain should be treated, but on the other hand, all drugs have adverse effects. Non-pharmacological methods should be preferred and also facilitated on a system level. If opioids are used, low initial doses and careful monitoring should follow. Research should focus on investigating the safest and most effective ways of treating pain in individuals with cognitive disorders.”

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