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ESS Improves CRS-Related Subjective Olfactory Dysfunction

by Brent Senior, MD • June 5, 2016

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What is the impact of endoscopic sinus surgery (ESS) on improvement in olfaction and olfactory-specific quality of life (QOL)?

Background: Olfactory loss is a cardinal symptom of chronic rhinosinusitis (CRS), affecting 40% to 80% of patients. Objective assessment of olfactory improvement using instruments such as the 40-item smell identification test (SIT-40) or Sniffin’ Sticks has been reported in 23% to 68% of patients; however, few studies have focused on olfaction-specific QOL using questionnaires such as the questionnaire of olfactory disorders (QOD-NS).

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Explore this issue:
June 2016

Study design: Adult patients with CRS from an ongoing multi-institutional prospective cohort study were included.

Setting: Rhinology clinics at the Medical University of South Carolina in Charleston, Oregon Health and Sciences University in Portland, and University of Utah in Salt Lake City.

Synopsis: The overall cohort included 121 patients with CRS; 51 had CRS with polyps. Overall baseline SIT-40 scores were 26.4 +/- 10.3, with 28 patients categorized as anosmic (23%) and 59 (49%) hyposmic; significant differences were noted in QOD-NS scores among patients categorized as anosmic, hyposmic, and normosmic. On the Sino-Nasal Outcome Test (SNOT-22) pertaining to olfaction, a significant difference was seen in response to question 21 between anosmic and hyposmic categories (p<0.001) as well as between anosmic and normosmic (p<0.291). Similarly, the average Rhinosinusitis Disability Index (RSDI) physical subdomain question 7 baseline score showed a significant difference between the anosmic and hyposmic categories (p<0.001) as well as the anosmic and normosmic categories (p<0.001), but not between the hyposmic and normosmic categories (p=0.578). Baseline QOD-NS was worse in patients with asthma, allergy, AERD, obstructive sleep apnea, nasal polyps, and steroid dependency. The average QOD-NS score improved after ESS from 35.7 +/- 13.0 to 39.7 +/- 12.2 (p=0.006). When examining demographic, comorbid, and CRS severity measures, baseline CT scores were the only variable that significantly predicted change in QOD-NS after surgery. Changes in QOD-NS scores after surgery did not correlate with SIT-40 change scores; however, these changes did correlate to the olfaction related question in the RSDI and SNOT-22.

Bottom line: ESS improves CRS-related subjective olfactory dysfunction with greatest gains seen in those with poorer CT scores at baseline.

Citation: Soler ZM, Smith TL, Alt JA, et al. Olfactory specific quality of life outcomes after endoscopic sinus surgery. Int Forum Allergy Rhinol. 2016;6:407-413.

Filed Under: Literature Reviews, Practice Focus, Rhinology, Rhinology Tagged With: chronic rhinosinusitis, CRS, endoscopic sinus surgery, ESS, olfactory dysfunctionIssue: June 2016

You might also like:

  • ESS Improves CRS-Related Subjective Olfactory Dysfunction
  • Olfactory Recovery Is Possible Following Post-Infectious Olfactory Loss
  • Olfactory Training Creates Gray Matter Changes in Patients with Hyposmia
  • Sleep Dysfunction a Strong Indicator of ESS Election for CRS

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