Mechanisms of oronasal airflow partitioning in dogs
| Autor: | A. Brancatisano, T. Van der Touw, N. O'Neill, T. C. Amis |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Pulmonary and Respiratory Medicine
Nasal cavity Male Physiology Airflow Stimulation Electromyography Anesthesia General Dogs medicine Animals Mouth medicine.diagnostic_test Soft palate business.industry Electric Stimulation Respiratory Muscles medicine.anatomical_structure Laryngeal Muscle Anesthesia Breathing Female medicine.symptom Laryngeal Muscles Nasal Cavity Palate Soft business Pulmonary Ventilation Muscle contraction |
| Zdroj: | Respiration physiology. 104(2-3) |
| ISSN: | 0034-5687 |
| Popis: | We examined the integrated (MTA) electromyographic activity (EMG) of the hyoepiglotticus (HE) muscle and the soft palate muscles (SPM) during CO2 administration in 6 anaesthetised prone, mouth open dogs. As ventilation increased nasal flow (VN) as a percentage of total flow (VT), i.e. VN/VT%, decreased. Breath-by-breath peak inspiratory and peak expiratory HE EMG activity was strongly and inversely correlated with VN/VT% (both r > 0.8, p < 0.001), whereas the correlation between SPM MTA EMG activity and VN/VT% was highly variable. Severing of the HE muscles halved the rate at which VN/VT% was reduced with respect to increasing ventilation while electrical stimulation of HE muscle contraction resulted in a fall in VN/VT% to near zero levels. Active control of epiglottic position appears to be an important mechanism controlling the patency of the epiglottic-soft palate seal and thus the oronasal partitioning of airflow in dogs. |
| Databáze: | OpenAIRE |
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