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[Are there olfactory evoked alterations of breathing patterns?]
1HNO-Klinik der Friedrich-Schiller-Universität Jena. hilmar.gudziol@med.uni-jena.de
Laryngo- Rhino- Otologie
|June 16, 2004
Summary
Strictly olfactory stimuli, like hydrogen sulfide (H2S), can alter breathing patterns, indicating intact smell ability. Computer analysis of respiration patterns objectively measures odor perception.
Area of Science:
- Olfactory neurobiology
- Respiratory physiology
- Psychophysics
Background:
- Debate exists on whether olfactory stimuli alone alter breathing patterns.
- Some researchers attribute respiratory changes to odor irritancy.
- Others view breathing pattern changes as evidence of olfactory function.
Purpose of the Study:
- To investigate if non-irritating olfactory stimuli can change breathing patterns.
- To assess the reliability of computer-analyzed respiration for quantifying odor perception.
Main Methods:
- 12 healthy volunteers inhaled hydrogen sulfide (H2S) or clean air.
- Breathing patterns were recorded using a differential pressure transducer.
- A respiration index (RI) was calculated by comparing breathing during stimulation to pre-stimulation baselines.
Main Results:
- Hydrogen sulfide (H2S) significantly altered breathing patterns compared to clean air (p < 0.001).
- The calculated respiration index (RI) showed significant differences between H2S and clean air stimuli.
- No significant adaptation in breathing response was observed during repeated H2S stimulations.
Conclusions:
- Short, detectable hydrogen sulfide (H2S) stimuli can induce measurable changes in breathing.
- Computer-assisted respiration analysis (Respiration-olfactometry) provides an objective method to assess odor perception.