Related Experiment Videos
Pharyngeal and glottic changes following methacholine challenge in normal subjects
Bulletin Europeen De Physiopathologie Respiratoire
|May 1, 1986
Summary
Methacholine inhalation caused narrowing in both the glottis and pharynx in healthy subjects. This suggests a generalized reflex response during airway constriction, impacting upper airway dimensions.
Area of Science:
- Respiratory physiology
- Pulmonary medicine
- Airway dynamics
Background:
- Bronchospasm can lead to glottic narrowing in healthy individuals and asthmatics.
- The mechanism is hypothesized to involve a generalized reflex response to intrapulmonary airway constriction.
Purpose of the Study:
- To investigate if the pharynx exhibits similar cross-sectional area changes to the glottis after methacholine-induced bronchospasm.
- To test the hypothesis of coincident pharyngeal and glottic changes during airway constriction.
Main Methods:
- Seven healthy subjects participated in the study.
- The acoustic reflection technique was used to measure pharyngeal and glottic cross-sectional areas.
- Measurements were taken before and after methacholine inhalation.
Main Results:
- Methacholine inhalation significantly reduced both pharyngeal (5.0 to 4.6 cm²) and glottic (2.4 to 1.9 cm²) cross-sectional areas.
- The observed reductions in area were statistically significant (p < 0.05).
Conclusions:
- Methacholine inhalation induces comparable reductions in both glottic and pharyngeal areas in healthy subjects.
- The precise role of local or reflex mechanisms in mediating these upper airway changes requires further investigation.