HE+ Project Competition 2021

Page 1

Anaïs Pettecrew, Cheadle Hulme High School

A Painful Uncertainty: To What Extent is Pain Real? Introduction

Findings

Conclusions

Almost all of us will have experienced pain multiple times in our life. However, some experience pain more than most, and some have never experienced pain at all! So, what causes this variation in pain? Is medication the most effective form of pain relief? And is it possible to influence our own perception/experience of pain?

There are 3 types of pain: nociceptive, inflammatory and pathological. Nociceptive pain protects you from injury [3]. For example, if you touch a hot stove, nociceptive receptors in the skin relay the message to the CNS which in turn sends signals down motor neurones to tell you to move your hand away (reflex response). A lot of uncertainty still lies around how nociceptive pain can be influenced. Therefore, I decided to focus my research into this area.

This topic reminded me of a phrase my Grandma and her colleagues shared as nurses: "pain is what the patient says it is". My research demonstrated that this is still the case. Pain is highly subjective, and medication is not always the answer. I hope we will one day have answers to the questions I proposed in my introduction but, for now, the intricacies of pain remain largely uncertain.

Why this is an important topic A better understanding of pain could help to treat and explain conditions, such as: •

Congenital analgesia • A mutation which causes the individual to be unable to experience pain [1] Chronic pain • Affects between one third and one half of the UK population (Fayaz et al. 2016) [2] CRPS-2 • Sufferers experience excruciating pain even after the initial injury has healed [1]

For example, scientists have used biofeedback. Participants were shown a flame that represented the neural activity in their anterior cingulate cortex (ACC) which is involved in pain perception. After multiple training sessions, these patients with chronic pain were able to control and reduce the size of the flame and consequently lower their pain. They reported a 64% decrease in MPQ pain rating (assesses pain quality and intensity) and a 44% decrease in VAS pain rating (assesses pain intensity) [4]. This research is a promising start to discovering more about the benefits of non-medicinal pain relief. However, there is still a lot of uncertainty surrounding factors that can influence this nociceptive pain. One study which aims to demystify this area, investigated the effect of a sensory stimulus (smell) on pain unpleasantness. This study used odours to alter mood and found an induced negative mood led to increased pain evoked activation in the ACC. The figure on the right shows their results when a bad odour (BO) and a good odour (GO) was used [5]. The activation in the ACC during the BO, may explain why participants experienced increased pain unpleasantness when exposed to the bad odour.

Bibliography [1] Ramachandran, V. (2012). The Tell-Tale Brain. Windmill Books [2] Fayaz A, Croft P, Langford RM, Donaldson LJ, Jones GT. (2016) Prevalence of chronic pain in the UK: a systematic review and meta-analysis of population studies. BMJ Open 2016;6:e010364. Available from doi:10.1136/bmjopen-2015-010364 [3] Woolf, C. (2010) What is this thing called pain?. The Journal of Clinical Investigation, 120(11), 3742-3744. Available from doi:10.1172/JCI45178 [4] DeCharms, R.C., Maeda, F., Glover, G.H., Ludlow, D., Pauly, J.M., Soneji, D., Gabrieli, J.D. and Mackey, S.C. (2005) Control over brain activation and pain learned by using real-time functional MRI. Proceedings of the National Academy of Sciences, 102(51), 18626-18631. Available from doi:10.1073pnas.0505210102 [5] Villemure, C., Bushnell, M.C. (2009) Mood influences supraspinal pain processing separately from attention. Journal of Neuroscience, 29(3), 705-715. Available from doi:10.1523/JNEUROSCI.3822-08.2009


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