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ABOUT THE STUDY

The ACORN study aims to recruit patients undergoing major surgery to identify those at risk of persistent post-operative pain and prolonged opioid use
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What are we testing for?

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1

Predictors of
Post-Surgical Pain

To identify which patients are more likely to experience greater pain and discomfort after surgery.

This involves measuring both acute and chronic pain.

2

Risk of Persistent
Opioid Use

To determine which patients are more prone to continued opioid use following surgery.

3

Brain Biomarkers and Patient Phenotype

To assess how a patient's brain activity, mental state, and metabolism before surgery may predict their vulnerability to post-surgical pain and opioid use.

Why are we testing?

The opioid crisis has become a major global health problem, deeply affecting individuals, families, and communities. Every year, about 310 million major surgeries are performed worldwide, including 50 million in the United States, 20 million in Europe, and 6 million in the United Kingdom. For decades, opioids have been the go-to treatment for managing pain after surgery. While they are effective in relieving pain, long-term use can lead to addiction and dependency. This misuse has contributed to rising healthcare costs and a concerning increase in overdose deaths. For most patients, opioids are first introduced during surgery, either as part of anesthesia or for short-term pain relief, and they are typically stopped without issue. However, some individuals end up in a pattern of "persistent opioid use," which means they continue using opioids for more than three months after surgery. Identifying these at-risk patients is crucial for preventing dependency and addressing the opioid crisis. By recognizing which patients are more vulnerable to long-term opioid use, doctors can take steps to reduce risks. This includes educating patients about the dangers of opioids and offering alternative ways to manage pain without relying on these medications.

Who is eligible to take part?

Anyone undergoing a major surgery is eligible to take part. This includes, but is not limited to, thoracic surgery (e.g. surgery on the lungs, trachea, oesophagus). If you express interest in taking part, our clinical team will contact you for further information to assess your suitability for the study.

What does the ACORN study involve?

Electroencepholography (EEG)

  • EEG is a non-invasive and painless method of measuring your brain activity.

  • We do this by putting an EEG cap on your head and recording your brain waves.

  • EEG is taken once before the surgery and 72 hours after the surgery or before discharge.

  • It only takes 15 minutes.

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EEG

Questionnaires

  • Completed before surgery, 72 hours after surgery, and at 3 and 6 months post-surgery.

  • Weekly reporting of pain levels for the first 3 months after surgery via web or SMS.

  • Includes various scales and inventories to assess pain, anxiety, depression, and general well-being.

Questionnaires

Blood Tests

  • Taken once before surgery and again 72 hours after surgery or before discharge.

  • Up to 70ml of blood is collected.

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Urine Samples

  • Collected before surgery and at 3 and 6 months post-surgery online or using mail-in kits.

  • Measures the level of pain medication usage.

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  • Information on recovery from medical records held by hospitals and GP surgeries.

Other Data

Blood tests
Urine samples
Other data
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