Icebergs, oceans and sprawling landscapes – could these tranquil scenes be beneficial for people suffering with chronic pain?
In a small proof-of-concept study, published in Pain Reports, a team from Imperial used VR video to reduce peoples’ scores of perceived ongoing pain as well their sensitivity to painful stimuli.
Beyond the distracting effect, the researchers think immersing patients in VR may actually trigger the body’s own inbuilt pain-fighting systems.
Using VR for chronic pain
Dr Sam Hughes, from the MSk Lab at Imperial and first author on the paper, said: “One of the key features of chronic pain is you get increased sensitivity to painful stimuli. This means patients’ nerves are constantly ‘firing’ and telling their brain they are in a heightened state of pain.
“Our work suggests that VR may be interfering with processes in the brain, brainstem and spinal cord, which are known to be key parts of our inbuilt pain-fighting systems and are instrumental in regulating the spread of increased sensitivity to pain.”
Virtual reality has been trialled as a method to distract patients from the pain, with some success in minor dental procedures requiring local anaesthetic, but the latest study looked to see if it could work in a simulated model of chronic pain.
Still image versus immersive videos
The research team found that ongoing pain was reduced following VR immersion, and that sensitivity to painful stimuli on the skin was also reduced. However, the same effect was not seen in people who looked at still images of the polar environment, showing immersion is the key factor.
They explain that while the initial findings are encouraging, the study is limited by the small number of healthy participants, without chronic pain. Future randomised controlled trials with chronic pain patients could also help to confirm its potential benefit for patients.
However, the researchers believe VR could hold the potential to treat patients with chronic pain who often have deficient inbuilt pain fighting systems, and that using VR may provide an alternative therapy for some chronic pain conditions by improving activity in brain regions involved in these pain-relief systems.
The team, which included Dr Paul Strutton from the Department of Surgery & Cancer and MRes Biomedical Research student Ms Hongyan Zhao, now plans to further investigate the pathways involved in the VR dampening effect, including whether a dosing regimen would work – such as 30 minutes, four times a day – and if the effects would be cumulative or remain temporary.
Dr Hughes said: “The aim of this study was to show VR has the ability to change the pathological processing associated with chronic pain.
“Using this approach does seem to reduce the overall intensity of the ongoing pain as well as the response we get on the skin. We think there could be changes in the body’s pain relief system’s which can affect how pain sensitivity is processed in the spinal cord.”
He added: “There are still many things to figure out, but one exciting aspect of our study is that the VR design we used is completely passive – meaning patients don’t need to use their arms. Potentially, it could mean that patients who are bed-bound or can’t move their limbs, but with chronic pain, could still benefit from this approach.”