A New Target for Central Desensitization: Pain Reprocessing Therapy Modifies Auditory Hyperresponsivity
A randomized controlled trial published in *Annals of Neurology* investigates the phenomenon of heightened sensitivity to non-noxious stimuli in chronic pain. The study compared 142 adults with chronic back pain (CBP) to 51 pain-free controls, assessing behavioral and neural responses to auditory and pressure stimulation. Results showed CBP patients reported significantly greater unpleasantness to sounds, a condition termed auditory hyperresponsivity. Functional MRI revealed this was associated with hyperactivation in the auditory cortex and insula, alongside reduced activity in default mode network regions. Notably, the neural patterns overlapped with those seen in fibromyalgia. In the trial component, Pain Reprocessing Therapy (PRT) was compared to placebo and usual care. PRT led to small but measurable reductions in the unpleasantness of low-intensity sounds and increased medial prefrontal cortex responses, suggesting a potential pathway for broader central nervous system desensitization.
Why it might matter to you: This research directly intersects with the anesthesiologist’s role in perioperative pain management and multimodal analgesia. Understanding that chronic pain involves a generalized aversive state, beyond the surgical site, reframes the goal of interventions from simple nociceptive blockade to modulating central sensitization. For clinical practice, it highlights the potential utility of adjunctive psychological therapies like PRT to improve patient outcomes by targeting the maladaptive neural processing that underpins chronic post-surgical pain, potentially reducing long-term opioid reliance.
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