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Psychological Treatment Yields Strong, Lasting Relief for Chronic Pain Sufferers

by Mozhgan Jamshidi Eyni
October 4, 2021
in Uncategorized
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Psychological Treatment Yields Strong, Lasting Relief for Chronic Pain Sufferers

The findings provide some of the strongest evidence yet that a psychological treatment can provide potent and durable relief for chronic pain, which afflicts one in five Americans.

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Summary: A four-week course of pain reprocessing therapy (PRT) provided up to 12 months of relief from pain for chronic pain sufferers. Additionally, the psychological treatment program altered brain networks associated with pain processing.

Source: University of Colorado

Rethinking what causes pain and how great of a threat it is can provide chronic pain patients with lasting relief and alter brain networks associated with pain processing, according to new University of Colorado Boulder-led research.

The study, published Sept. 29 in JAMA Psychiatry, found that two-thirds of chronic back pain patients who underwent a four-week psychological treatment called Pain Reprocessing Therapy (PRT) were pain-free or nearly pain-free post-treatment. And most maintained relief for one year.

The findings provide some of the strongest evidence yet that a psychological treatment can provide potent and durable relief for chronic pain, which afflicts one in five Americans.

“For a long time we have thought that chronic pain is due primarily to problems in the body, and most treatments to date have targeted that,” said lead author Yoni Ashar, who conducted the study while earning his PhD in the Department of Psychology and Neuroscience at CU Boulder. “This treatment is based on the premise that the brain can generate pain in the absence of injury or after an injury has healed, and that people can unlearn that pain. Our study shows it works.”

Misfiring neural pathways

Approximately 85% of people with chronic back pain have what is known as “primary pain,” meaning tests are unable to identify a clear bodily source, such as tissue damage.

Misfiring neural pathways are at least partially to blame: Different brain regions—including those associated with reward and fear—activate more during episodes of chronic pain than acute pain, studies show. And among chronic pain patients, certain neural networks are sensitized to overreact to even mild stimuli.

If pain is a warning signal that something is wrong with the body, primary chronic pain, Ashar said, is “like a false alarm stuck in the ‘on’ position.”

PRT seeks to turn off the alarm.

“The idea is that by thinking about the pain as safe rather than threatening, patients can alter the brain networks reinforcing the pain, and neutralize it,” said Ashar, now a postdoctoral researcher at Weill Cornell Medicine.

For the randomized controlled trial, Ashar and senior author Tor Wager, now the Diana L. Taylor Distinguished Professor in Neuroscience at Dartmouth College, recruited 151 men and women who had back pain for at least six months at an intensity of at least four on a scale of zero to 10.

Those in the treatment group completed an assessment followed by eight one-hour sessions of PRT, a technique developed by Los Angeles-based pain psychologist Alan Gordon. The goal: To educate the patient about the role of the brain in generating chronic pain; to help them reappraise their pain as they engage in movements they’d been afraid to do; and to help them address emotions that may exacerbate their pain. 

Pain is not ‘all in your head’

“This isn’t suggesting that your pain is not real or that it’s ‘all in your head’,” stressed Wager, noting that changes to neural pathways in the brain can linger long after an injury is gone, reinforced by such associations. “What it means is that if the causes are in the brain, the solutions may be there, too.”

Before and after treatment, participants also underwent functional magnetic resonance imaging (fMRI) scans to measure how their brains reacted to a mild pain stimulus.

After treatment, 66% of patients in the treatment group were pain-free or nearly pain-free compared to 20% of the placebo group and 10% of the no-treatment group.

“The magnitude and durability of pain reductions we saw are very rarely observed in chronic pain treatment trials,” Ashar said, noting that opioids have yielded only moderate and short-term relief in many trials.

And when people in the PRT group were exposed to pain in the scanner post-treatment, brain regions associated with pain processing – including the anterior insula and anterior midcingulate —had quieted significantly.

The authors stress that the treatment is not intended for “secondary pain” – that rooted in acute injury or disease.

The study focused specifically on PRT for chronic back pain, so future, larger studies are needed to determine if it would yeild similar results for other types of chronic pain. 

Meanwhile, other similar brain-centered techniques are already ememrging among physical therapists and other clinicians who treat pain.

“This study suggests a fundamentally new way to think about both the causes of chronic back pain for many people and the tools that are available to treat that pain,” said co-author Sona Dimidjian, professor of psychology and neuroscience and director of the Renee Crown Wellness Institute at CU Boulder. “ It provides a potentially powerful option for people who want to live free or nearly free of pain.”

Abstract

Effect of Pain Reprocessing Therapy vs Placebo and Usual Care for Patients with Chronic Back Pain

Importance  

Chronic back pain (CBP) is a leading cause of disability, and treatment is often ineffective. Approximately 85% of cases are primary CBP, for which peripheral etiology cannot be identified, and maintenance factors include fear, avoidance, and beliefs that pain indicates injury.

Objective  

To test whether a psychological treatment (pain reprocessing therapy [PRT]) aiming to shift patients’ beliefs about the causes and threat value of pain provides substantial and durable pain relief from primary CBP and to investigate treatment mechanisms.

Design, Setting, and Participants 

This randomized clinical trial with longitudinal functional magnetic resonance imaging (fMRI) and 1-year follow-up assessment was conducted in a university research setting from November 2017 to August 2018, with 1-year follow-up completed by November 2019. Clinical and fMRI data were analyzed from January 2019 to August 2020. The study compared PRT with an open-label placebo treatment and with usual care in a community sample.

Interventions  

Participants randomized to PRT participated in 1 telehealth session with a physician and 8 psychological treatment sessions over 4 weeks. Treatment aimed to help patients reconceptualize their pain as due to nondangerous brain activity rather than peripheral tissue injury, using a combination of cognitive, somatic, and exposure-based techniques. Participants randomized to placebo received an open-label subcutaneous saline injection in the back; participants randomized to usual care continued their routine, ongoing care.

Main Outcomes and Measures  

One-week mean back pain intensity score (0 to 10) at posttreatment, pain beliefs, and fMRI measures of evoked pain and resting connectivity.

Results  

At baseline, 151 adults (54% female; mean [SD] age, 41.1 [15.6] years) reported mean (SD) pain of low to moderate severity (mean [SD] pain intensity, 4.10 [1.26] of 10; mean [SD] disability, 23.34 [10.12] of 100) and mean (SD) pain duration of 10.0 (8.9) years. Large group differences in pain were observed at posttreatment, with a mean (SD) pain score of 1.18 (1.24) in the PRT group, 2.84 (1.64) in the placebo group, and 3.13 (1.45) in the usual care group. Hedges g was −1.14 for PRT vs placebo and −1.74 for PRT vs usual care (P < .001). Of 151 total participants, 33 of 50 participants (66%) randomized to PRT were pain-free or nearly pain-free at posttreatment (reporting a pain intensity score of 0 or 1 of 10), compared with 10 of 51 participants (20%) randomized to placebo and 5 of 50 participants (10%) randomized to usual care. Treatment effects were maintained at 1-year follow-up, with a mean (SD) pain score of 1.51 (1.59) in the PRT group, 2.79 (1.78) in the placebo group, and 3.00 (1.77) in the usual care group. Hedges g was −0.70 for PRT vs placebo (P = .001) and −1.05 for PRT vs usual care (P < .001) at 1-year follow-up. Longitudinal fMRI showed (1) reduced responses to evoked back pain in the anterior midcingulate and the anterior prefrontal cortex for PRT vs placebo; (2) reduced responses in the anterior insula for PRT vs usual care; (3) increased resting connectivity from the anterior prefrontal cortex and the anterior insula to the primary somatosensory cortex for PRT vs both control groups; and (4) increased connectivity from the anterior midcingulate to the precuneus for PRT vs usual care.

Conclusions and Relevance  

Psychological treatment centered on changing patients’ beliefs about the causes and threat value of pain may provide substantial and durable pain relief for people with CBP.

Trial Registration  

ClinicalTrials.gov Identifier: NCT03294148.

About this pain and psychology research news

Author: Lisa Marshall
Source: University of Colorado
Contact: Lisa Marshall – University of Colorado

Original Research: Open access.
“Effect of Pain Reprocessing Therapy vs Placebo and Usual Care for Patients with Chronic Back Pain” by Yoni Ashar et al. JAMA Psychiatry

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