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Keywords:

  • Olfaction;
  • smell;
  • quality of life;
  • parosmia;
  • questionnaire;
  • Level of Evidence: 4

Abstract

Objectives/Hypothesis:

To measure health-related and olfaction-related quality of life (QoL) in patients with permanent, severe hyposmia or functional anosmia.

Study Design:

A case study in a university ENT department of patients with severe olfactory dysfunction defined by Sniffin' Sticks olfactory test kit with a score for odor threshold, discrimination, and identification (TDI) < 20 and a dysfunction lasting longer than 6 months.

Methods:

Assessment of QoL by using the SF-36 Health Survey questionnaire and the Questionnaire for Olfactory Dysfunction (QOD).

Results:

A total of 958 patients were tested for smell disturbances from 1999 to 2009. Surveys were mailed to 527 patients who fulfilled the inclusion criteria; 280 (53%) returned completed surveys. All SF-36 domains in severely hyposmic and anosmic patients were lower than in the German normal population. Lower SF-36 QoL was found for some domains in female patients, older patients, and hyposmic patients (P < .05 for all groups). Based on the QOD, women showed more parosmia, and anosmic patients had more olfactory-related impairment (P < .05 for both); in general, higher olfactory impairment and higher parosmia score measured by QOD correlated with lower TDI values (all P < .05). Multivariate analysis revealed, for SF-36 domains, the following independent risk factors: female sex was a risk factor for bodily pain; higher age was a risk factor for physical functioning and role, bodily pain, and general health; hyposmia was a risk factor for bodily pain and mental health; QOD QoL was a risk factor for all SF-36 scales; and QOD parosmia was a risk factor for physical role (all P < .05).

Conclusions:

QoL is severely impaired in patients with chronic severe hyposmia or anosmia. The QOD allows a more olfaction-specific assessment of QoL than the SF-36 instrument. Laryngoscope, 2011