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Decreased trigeminal sensitivity in anosmia
H Gudziol1, M Schubert, T Hummel
1Department of Otorhinolaryngology, Friedrich Schiller University of Jena Medical School, Jena, Germany.
Summary
Patients with anosmia (loss of smell) show reduced sensitivity to intranasal trigeminal stimuli. This trigeminal nerve dysfunction is more pronounced in post-traumatic anosmia cases.
Area of Science:
- Neuroscience
- Otorhinolaryngology
Background:
- Anosmia, or the loss of smell, can result from various conditions, including head trauma and sinonasal diseases.
- Intranasal trigeminal sensitivity plays a role in nasal sensation and can be affected by olfactory dysfunction.
Purpose of the Study:
- To investigate intranasal trigeminal sensitivity in patients with anosmia of different etiologies.
- To compare trigeminal sensitivity between patients with post-traumatic anosmia and those with sinonasal disease-related anosmia.
Main Methods:
- Assessed trigeminal detection thresholds for formic acid in healthy controls (n=96) and anosmic patients (n=72).
- Categorized anosmic patients into groups based on etiology: head trauma (n=18) and sinonasal disease (n=54).
Main Results:
- Anosmic patients exhibited significantly higher trigeminal detection thresholds compared to normosmic controls (p < 0.001).
- Patients with post-traumatic anosmia demonstrated higher thresholds than those with sinonasal disease-related anosmia (p < 0.001).
Conclusions:
- Loss of olfactory function is associated with decreased sensitivity to intranasal trigeminal stimuli.
- Intranasal trigeminal function is more significantly altered in post-traumatic anosmia compared to sinonasal disease-related anosmia.
- Findings have implications for medicolegal assessments of anosmic patients using trigeminal stimuli to gauge response bias.