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Retronasal olfactory function in nasal polyposis.

Basile N Landis1, Roland Giger, Alma Ricchetti

  • 1Clinique et Policlinique d'ORL et de Chirurgie cervico-faciale, Hôpitaux Universitaires de Genève, Geneva, Switzerland. Basile.Landis@hcuge.ch

The Laryngoscope
|November 7, 2003
PubMed
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Patients with chronic rhinosinusitis with nasal polyposis (NP) show better retronasal than orthonasal smell function. This suggests regional factors, not general smell loss, cause olfactory dysfunction in NP patients.

Area of Science:

  • Otorhinolaryngology
  • Neuroscience
  • Olfactory Research

Background:

  • Chronic rhinosinusitis with nasal polyposis (NP) often presents with smell loss.
  • Patients with NP may not report loss of food appreciation, suggesting selective olfactory deficits.

Purpose of the Study:

  • To compare retronasal olfactory function between NP patients and healthy controls.
  • To investigate the specific mechanisms of smell impairment in NP.

Main Methods:

  • An open prospective study compared 42 NP patients with 56 healthy controls.
  • Orthonasal and retronasal odor identification were assessed using "Sniffin' Sticks" and odorized powders.
  • Nasal endoscopy and NP staging (Malm classification) were performed; patients rated olfactory function.

Related Experiment Videos

Main Results:

  • Odor identification was significantly poorer in NP patients compared to controls.
  • NP patients demonstrated better retronasal than orthonasal olfactory function.
  • Patient-rated olfactory abilities correlated with objective testing in NP patients.

Conclusions:

  • Retronasal olfactory function appears superior to orthonasal function in NP, possibly due to mechanical obstruction.
  • Olfactory loss in NP is likely driven by localized mechanical or inflammatory factors within the olfactory cleft.