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<h1><span>Searching for a Way to Predict Pain</span>
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<p>A University of Texas researcher with the NIH HEAL Initiative<sup>®</sup> hopes to create a blood test to measure a person’s sensitivity to pain.</p>
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<p>Imagine you’re lying down on a hospital bed with a needle inserted in each side of your face. Every 20 seconds, you push a button to indicate how much pain you’re in. At first, you just feel a tingle, but then the pain builds. And builds. And builds.</p>
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<p>That’s the experience of participating in a research project on pain by Alan Prossin, M.B.B.S., a psychiatrist and engineer at <a href="https://med.uth.edu/psychiatry/faculty/alan-r-prossin-mbbs/">The University of Texas Health Science Center at Houston</a>. Prossin works with healthy people <a>who are scheduled to have plastic surgery and who volunteer </a>to help him understand pain.</p>
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<p>“They’re not so excited when they are experiencing the pain, but they’re happy to contribute to the science,” Prossin said.</p>
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<p><a href="/funding/awarded?combine=1R61NS113316-01">Prossin’s work</a> through the NIH Helping to End Addiction Long-term<sup>®</sup> Initiative, or NIH HEAL Initiative<sup>®</sup>, is part of the initiative’s research effort in <a href="/research/preclinical-translational/biomarkers">discovery and validation of biomarkers for pain</a> to <a href="/research/preclinical-translational">create new, non-addictive treatments</a>.</p>
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Doctors currently can’t predict how much pain a person will feel after surgery, making it difficult to tailor pain treatments. One NIH HEAL Initiative researcher hopes to develop a blood test to predict how sensitive people will be to pain after surgery.
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<a class="btn btn gtm-tweet-quote square pull-right twitter-share-button btn-white" href=https://twitter.com/intent/tweet?url=https://heal.nih.gov/news/stories/predicting-pain&text=>
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<h2>The connection between surgery and the opioid crisis</h2>
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<p>Many people first encounter opioids when the medicines are prescribed for pain after surgery. Most take opioids for only a short time, stop, and never have a problem. But for some people, those opioids lead to dependence or addiction. That’s why understanding pain and finding alternatives to opioid pain relievers are key goals of the NIH HEAL Initiative.</p>
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<p>“One of the issues is that we don’t really have a personalized approach to dealing with pain,” said Prossin. A personalized approach to pain might include understanding how sensitive each person is to pain and whether non-opioid treatments might work better for them.</p>
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<p>The challenge is that people vary in their sensitivity to pain. The same surgery might result in a lot of pain for one person and hardly any for another. Currently, doctors can’t know who will fall into which group. Prossin is developing new ways to predict which patients are most likely to experience pain after surgery, making it possible to tailor treatments.</p>
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<h2>Signing up for pain</h2>
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<p>To find a way to predict a person’s level of pain after surgery, Prossin first needs to induce pain in participants and measure their overall sensitivity to pain before surgery.</p>
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<p>The whole procedure is done with the volunteer lying inside a machine called a PET scanner, which records brain activity. A needle trickles very salty water into the side of a participant’s face — and it hurts. During the test, Prossin increases the amount of water flowing through the needle. The higher the flow, the worse the pain.</p>
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<p>Prossin stops when a participant says their pain is about 40 on a scale of 0 to 100 —<a> similar </a>to a bad toothache. Participants who reach that level of pain at a lower flow of salty water are more sensitive to pain than those who stop only when the water flow is higher.</p>
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<p>Prossin takes blood samples throughout the experiment. Along with the blood draws, the brain scans will help show how the body reacts to the painful procedure.</p>
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<p> </p>
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<h2>The Pain Sensitivity Test</h2>
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<img loading="lazy" src="/files/Step1%402x.jpg" width="1110" height="307" alt="Step 1. A participant lies down with their head inside a PET scanner, a kind of imaging machine that looks at activity in the brain." class="img-fluid" />
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<img loading="lazy" src="/files/Step2%402x%20%281%29.jpg" width="1110" height="358" alt="Step 2. A needle filled with salty water is inserted into each side of the participant's face, a bit above the corner of the jaw. Over the next 20 minutes, a tiny quantity of salt water trickles through the needle on one side." class="img-fluid" />
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<img loading="lazy" src="/files/pain_Step3%281%29.png" width="1110" height="332" alt="Step 3. Every 20 seconds, the person pushes a button to indicate how much pain they are feeling, on a scale of 0 to 100. (With regular salty water, most people feel very little pain.)" class="img-fluid" />
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<img loading="lazy" src="/files/Step4%402x.jpg" width="1110" height="313" alt="Step 4. The procedure repeats on the other side with much saltier water, causing about as much pain as a bad toothache. Prossin will compare this to the results from the first side." class="img-fluid" />
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<img loading="lazy" src="/files/Step5%402x.jpg" width="1110" height="234" alt="Step 5. Every 10 minutes a blood sample is taken. Eventually, Prossin will use this information to develop a blood test that may help show how sensitive someone is to pain." class="img-fluid" />
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<p><em>These are the basic steps of the pain sensitivity test that participants in Prossin’s study will experience.</em> <em><a href="/files/predicting-pain_steps.png">Download a full-size version of this graphic.</a></em> <em>Graphic</em> <em>Credit: NIH HEAL Initiative.</em></p>
|
||
|
||
<p> </p>
|
||
|
||
<h2>Connecting proteins to pain</h2>
|
||
|
||
<p>Prossin is looking at a group of proteins in the volunteers’ blood called the interleukin-1 (IL-1) family cytokines. The body produces these cytokines to help respond to infection and injury. Research on rodents has shown that higher levels of IL-1 family cytokines can make pain worse, and Prossin has data suggesting that the same is true for humans.</p>
|
||
|
||
<p><a>Once enough people have participated, Prossin and his colleagues will compare the levels of the various IL-1 family cytokines in the blood samples. There are about 15 proteins in the IL-1 family; he plans to select the ones that best predict how sensitive someone is to pain.</a></p>
|
||
|
||
<p>Later, after each person’s plastic surgery, the research team will monitor how much pain the volunteer feels — both in the short term and six to eight months later. Prossin will use this information to test whether cytokine levels from the first part of the study can predict how much pain someone experiences after surgery in both the short and long terms.</p>
|
||
|
||
<p>This knowledge might someday predict how likely someone is to experience pain after surgery. It could also help doctors use existing treatments in new ways, tailored to the individual patient. For example, one anesthesia medicine has been shown to reduce the levels of IL-1 family cytokines. Maybe, Prossin says, using that medicine in anesthesia for people who have high cytokine levels would lessen their pain after surgery. The hope is that such personalized approaches will improve patients’ experiences and, in the long run, result in fewer opioid prescriptions.</p>
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<h2>Research in its early stages</h2>
|
||
|
||
<p>Prossin’s research is at an early stage; he is still recruiting volunteers for the project. He will also need to repeat the pain test in a larger group, including people with depression and anxiety — conditions that can make pain worse.</p>
|
||
|
||
<p>“I don’t want to say that I have the holy grail,” Prossin said. “I’m a realist. But I believe the work we are doing will contribute to the science. I hope it will bring us to a point where we can make treatment more personalized.”</p>
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<div class="views-row"><span class="views-field views-field-field-research-program"><span class="views-label views-label-field-research-program">Research Program: </span><div class="field-content"><a href="/research/clinical-research/biomarkers" hreflang="en">Discovery and Validation of Biomarkers, Endpoints, and Signatures for Pain Conditions</a></div></span><span class="views-field views-field-field-research-focus-area"><span class="views-label views-label-field-research-focus-area">Research Focus Area: </span><div class="field-content"><a href="/research/preclinical-translational" hreflang="en">Preclinical and Translational Research in Pain Management</a></div></span></div>
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Read About This Project on NIH RePORT
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<p>Learn more about Prossin’s project, “Discovery and Analytical Validation of Inflammatory Bio-Signatures of the Human Pain Experience.”</p>
|
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<p>Explore programs and funded projects within the Preclinical and Translational Research in Pain Management focus area.</p>
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<p>Learn more about NINDS’ role in the NIH HEAL Initiative.</p>
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<p class="last-updated">Published:
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March 31, 2020</p>
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