A. Welge-luessen et al., Laryngectomees using the Sniffin'Sticks test battery and chemosensory evoked potentials, LARYNGOSCOP, 110(2), 2000, pp. 303-306
Objectives/Hypothesis: Laryngectomees are often considered to be completely
anosmic, The aim of this study was to determine whether anosmia in larynge
ctomees reflects diminished transport of odorants to the olfactory epitheli
um or olfactory epithelial damage, Study Design: Twenty-five laryngectomees
were examined psychophysically using the Sniffin'Sticks test battery, All
patients rated the degree of their subjectively perceived deficit on a rati
ng scale. Chemosensory evoked potentials were also recorded in 11 of 25 pat
ients. Results: Sixteen patients complained very little about their smell d
eficit, even though the psychophysical testing found 18 patients to be anos
mic and 7 hyposmic, Olfactory potentials could be recorded in only 7 of the
11 patients who received this evaluation, despite the fact that all 11 per
ceived, at least vaguely, the olfactory stimulus, H2S, during the recording
sessions, No meaningful correlation between the psychophysical and electro
physiological data was observed. Conclusions: The psychophysical data revea
led the laryngectomees to be either functionally anosmic or hyposmic, The o
lfactory evoked potential data suggested that at least in two thirds of the
laryngectomized patients the olfactory system had some function, even up t
o 22 years after surgery. Because patients in everyday situations find ways
to bring odorants to the olfactory mucosa, the low number of complaints ab
out subjectively perceived deficits is reasonable.