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Rhinology. 2016 Jun;54(2):170-5. doi: 10.4193/Rhin15.264.

Long term effects of olfactory training in patients with post-infectious olfactory loss.

Author information

1
Smell and Taste Clinic, 2nd Academic ORL Department, Aristotle University, Thessaloniki, Greece.

Abstract

BACKGROUND:

There is evidence of the effectiveness of repeated exposure to odours on short-term olfactory function. The aim of this study was to assess the long-term effects of olfactory training.

METHODS:

We conducted a prospective study of 111 patients with post-infectious olfactory dysfunction. Two groups of patients performed olfactory training for 16 and 56 weeks, respectively, and were compared with a control group. The training was performed twice daily using four odours (phenyl ethyl alcohol, eucalyptol, citronellal, eugenol). Olfactory testing was performed by means of the Sniffin Sticks test as a baseline assessment and then every 8 weeks for 56 weeks. Subjective ratings were performed using a visual analogue scale (0-100).

RESULTS:

Both training groups presented significantly higher scores than the controls. The long-term group had better results than the short-term group. Short-term training patients sustained their improvement within the follow-up period. Subsets analysis showed that training patients mainly increased identification and discrimination. Subjective ratings were in accordance with the olfactory test results.

CONCLUSION:

Long-term olfactory training seems to be associated with better results in patients with post-infectious olfactory loss than a short-term scheme. Short-term training provides sustainable results at 56 weeks follow-up assessment.

PMID:
27017331
DOI:
10.4193/Rhin15.264
[Indexed for MEDLINE]

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