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Opioids Prescribed for Pain Found to Disrupt Sleep

by Ramya Rachamanti on June 5, 2019 at 5:31 PM
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Opioids Prescribed for Pain Found to Disrupt Sleep

Evidence that opioid intake will help people with long-term pain to sleep better is limited and of poor quality, according to an interdisciplinary team of psychologists and medics from the University of Warwick in partnership with Lausanne University Hospital, Switzerland.

Many people suffering from long-term chronic pain use opioids as a sleep aid to take away pain and stop their sleep being disrupted. However, a new study led by the Department of Psychology at the University of Warwick with Warwick Medical School suggests that not enough research has been done to assess the benefits and risks of using painkillers for the purpose of improving sleep quality.

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Their study, a systematic review of existing research on the effects of opioids on sleep, has been published in Sleep Medicine Reviews.

Long-term chronic pain, has a debilitating impact on people's life. Sleep disruption is a particularly frequent issue for patients with chronic pain, with a vicious cycle building between bad nights and increased pain. Patients with chronic pain are often empirically prescribed opioids to reduce their pain enough to get a good night's sleep, but there has been little investigation of whether this is a safe and effective intervention.
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The researchers conducted a comprehensive systematic review of existing literature that examined the effects of opioids on sleep quality. As part of this, they conducted a meta-analysis of data from these studies, combining the results of 18 studies which were then narrowed down to 5 with comparable data.

They found that research on opioid effects on sleep quality was limited and of poor quality, often with potential publication bias and conflicts of interest, and rarely testing patients for sleep apnoea prior to and during the study.

Patients reported a small improvement in sleep quality when using opioids but that was not consistent with results derived from sleep assessment technologies, such as the total time and the percentage of time in deep sleep, which did not show an improvement.

Certain studies reported calmer sleep with less movement but the examined articles frequently did not examine the wider effects of opioid therapy such as subsequent functioning during the day. Where they did, reports of sedation and daytime sleepiness were very frequent.

Opioids are known to affect the brain mechanism that controls breathing. This can potentially create sleep apnoea events where individuals experience pauses or obstructions in breathing, like a choking sensation, resulting in snoring, gasping for air, dry mouth and even a headache in the morning. Insomnia is known to be 42% more likely among people with chronic pain prescribed opioids than controls without opioids.

Despite this, there was some evidence that low-medium dosed opioids could help improve sleep quality in some patients in the short term, but the effect was small and requires more investigation. For those prescribed a high dose of opioid therapy it didn't necessarily bring out better results.

The researchers are calling for better quality research into the effects of painkillers on sleep quality, as well as better information for patients from clinicians when considering opioid therapy.

Lead author Dr Nicole Tang, from the University's Department of Psychology, comments:

"The way people experience sleep could be quite different from what you get from physiological measurements. It is not uncommon for patients to report an improvement in their sleep quality when the severity of sleep disordered breathing has increased and without significant changes in important parameters reflecting deeper and more restorative sleep.

"This phenomenon is perplexing, and may reflect the inherent challenge in reconciling a wide range of ambiguous bodily information to make a categorical judgement whether sleep has improved or not after opioid therapy."

Concerns have been growing about prescriptions of opioids, which are increasing in the UK. Dr Harbinder Sandhu from Warwick Medical School, a co-author of the study, is leading a large clinical trial to support those with chronic pain to reduce their use of strong painkillers and manage their pain using non pharmacological alternatives. The NIHR-funded I-WOTCH (Improving the Wellbeing of People with Opioid Treated Chronic Pain) project is also collecting data on sleep quality. She comments:

"The benefits of opioids on managing chronic pain in the short term is well-evidenced. But we have not seen long-term benefits in managing pain and the effect on sleep is unknown, results of the study will help to inform future interventions in opioid pain management. Anyone who has concerns about opioid therapy should talk to their GP. "

Dr. Berna, a pain physician practising at the Lausanne University Hospital comments:

"Decisions regarding introducing or maintain long term opioid therapy are based on balancing risks and benefits with the patient suffering from chronic pain. Given that side effects and risks are sometimes not clear to patients, assessing vigilance as well as sleep both subjectively and with overnight objective measures before and after introducing opioids can be useful."



Source: Eurekalert
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