An Integrative Model Accounting for the Symptom Cluster Triggered After an Acoustic Shock.

Summary

Acoustic shocks sometimes trigger a cluster of debilitating symptoms, tinnitus, hyperacusis, ear fullness/tension, dizziness, and pain in and around the ear, that standard hearing tests can't explain. This paper elaborates the hypothesis that the tensor tympani muscle (TTM), the trigeminal nerve (TGN), and the trigeminal-cervical complex (TCC) are central: TTM overuse, then overload, then injury (hypoxia and an 'energy crisis') cause inflammation that activates the TGN, TCC, and cortex. Because the TCC integrates sensory input from the whole head-neck complex and projects back to it, middle-ear inflammation can be felt as pain outside the ear, and neck/jaw disorders can conversely produce otic symptoms.

Key findings

• Proposes the tensor tympani muscle, trigeminal nerve, and trigeminal-cervical complex (TCC) as the core generators of post-acoustic-shock symptoms.
• Mechanism chain: TTM overuse → overload → injury (hypoxia/'energy crisis') → inflammation activating the trigeminal system and cortex.
• TCC multimodal integration explains referred pain outside the ear and why neck/jaw disorders (whiplash, TMD) can cause ear symptoms.
• Explicitly framed as an experimentally testable starting point, a model, not yet proven.