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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Immunofluorescent Labeling in Nasal Mucosa Tissue Sections of Allergic Rhinitis Rats via Multicolor Immunoassay
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Published on: September 22, 2023

Olfactory dysfunction in allergic rhinitis.

Joel Guss1, Laurel Doghramji, Christine Reger

  • 1Department of Otorhinolaryngology: Head and Neck Surgery, University of Pennsylvania, Philadelphia, PA, USA.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|October 3, 2009
PubMed
Summary
This summary is machine-generated.

Allergic rhinitis can cause smell loss (hyposmia) even without sinus disease. This study found half of allergic rhinitis patients had impaired smell, highlighting the need for further research into olfactory dysfunction causes and treatments.

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Area of Science:

  • Otolaryngology
  • Allergy Immunology
  • Neuroscience

Background:

  • Olfactory dysfunction in allergic rhinitis was traditionally attributed to coexisting chronic rhinosinusitis.
  • Emerging evidence suggests allergic inflammation may directly impair olfaction, independent of sinonasal obstruction.

Purpose of the Study:

  • To investigate olfactory function in patients with allergic rhinitis.
  • To differentiate olfactory impairment in allergic rhinitis with and without chronic sinusitis.

Main Methods:

  • Fifty-one rhinitis patients underwent allergy testing, the University of Pennsylvania Smell Identification Test, and computed tomography (CT) sinus scanning.
  • Olfactory test results were compared to age- and gender-specific norms.

Main Results:

  • 80% of subjects had allergies; 50% of allergic patients exhibited hyposmia (impaired smell).
  • Allergic rhinitis patients without sinusitis on CT scans scored significantly lower than norms (30th percentile).
  • Hyposmia ranged from mild to moderate severity.

Conclusions:

  • A notable subset of allergic rhinitis patients experience hyposmia, even without detectable sinonasal mucosal disease.
  • The direct impact of allergic inflammation on olfaction warrants further investigation.
  • Understanding the pathophysiology is crucial for developing targeted treatments for olfactory loss in allergic rhinitis.