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Related Experiment Videos

Olfactory dysfunction in patients with head trauma

R L Doty1, D M Yousem, L T Pham

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, University of Pennsylvania Medical Center, Philadelphia, USA.

Archives of Neurology
|October 6, 1997
PubMed
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Head trauma (HT) frequently causes olfactory dysfunction, with most patients experiencing anosmia and limited recovery. Brain imaging reveals structural damage to olfactory pathways in HT patients.

Area of Science:

  • Neurology
  • Otolaryngology
  • Radiology

Background:

  • Head trauma (HT) commonly leads to olfactory dysfunction, but its characteristics, prevalence, and underlying causes remain unclear.
  • Understanding the impact of HT on the sense of smell is crucial for patient care and rehabilitation.

Purpose of the Study:

  • To quantify olfactory function in patients with HT-related smell complaints.
  • To investigate factors influencing olfactory function post-HT, including age, sex, trauma severity, and time since injury.
  • To use MRI to assess structural damage in olfactory bulbs, tracts, and related brain regions.

Main Methods:

  • 268 patients with HT underwent olfactory testing, depression inventory, and medical history review.
  • 66 patients were retested over time to assess olfactory function changes.

Related Experiment Videos

  • MRI was used to measure olfactory-related brain structure volumes in 15 patients and 15 controls.

    • Main Results:

    • 66.8% of patients had anosmia, 20.5% microsmia, and 12.7% normosmia.
    • Olfactory function showed limited improvement, with 18% worsening and only 3 patients regaining normal smell.
    • MRI revealed reduced olfactory bulb and tract volumes in male HT patients compared to controls.

    Conclusions:

    • Olfactory dysfunction after HT is typically severe (anosmia) with poor recovery prospects.
    • Parosmia prevalence decreases over time, suggesting some adaptation or resolution.
    • Structural damage to olfactory-related brain areas is common in patients with HT-induced smell loss.