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Laryngoscope. 2018 Jul;128(7):1518-1522. doi: 10.1002/lary.26985. Epub 2017 Nov 8.

Examination of olfactory training effectiveness in relation to its complexity and the cause of olfactory loss.

Author information

1
Smell & Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School, Dresden, Germany.
2
Institute of Psychology, University of Wroclaw, Wroclaw, Poland.
3
UCL Ear Institute, London, United Kingdom.
4
Centre for the Study of the Senses, Institute of Philosophy, School of Advanced Studies, University of London, London, United Kingdom.

Abstract

OBJECTIVE:

Although the effectiveness of olfactory training (OT) had already been documented, the optimal regimen for such training remains unexplored. We examined whether the complexity of OT, namely alteration of odor quantity and quality, increases its effectiveness.

DESIGN:

One-hundred eight patients (Mage = 60.1 ± 1) with postinfectious (n = 57) or idiopathic (n = 51) olfactory dysfunction underwent OT preceded and followed by examination of olfactory function.

METHODS:

Subjects were randomly assigned to one of the three experimental conditions: 1) simple training comprising four basic, single-molecule substances; 2) complex training involving four odor mixtures; and 3) odor-altering training in which patients changed sets of mixtures every 2 months.

RESULTS:

The analysis of variance revealed that the benefit seen in this sample was not affected by the complexity of OT with regard to odor mixtures or alteration of odor type. The highest increase of the Sniffin' Sticks (Burghardt GmbH; Wedel, Germany) threshold, discrimination, and identification (and overall TDI) score was observed in postinfectious patients.

CONCLUSION:

We conclude that the outcomes of OT are not strongly influenced by the training regimen. However, further investigation of OT regimens is required, particularly with regard to training duration.

LEVEL OF EVIDENCE:

2b. Laryngoscope, 128:1518-1522, 2018.

KEYWORDS:

Sniffin' Sticks; discrimination; identification; olfactory training; threshold

PMID:
29114936
DOI:
10.1002/lary.26985
[Indexed for MEDLINE]

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