Mechanisms of oronasal airflow partitioning in dogs

被引：7

作者：

Amis, TC

ONeill, N

VanderTouw, T

Brancatisano, A

机构：

[1] Department of Respiratory Medicine, Westmead Hospital, Westmead

来源：

RESPIRATION PHYSIOLOGY | 1996年 / 104卷 / 2-3期

关键词：

flow oronasal; partitioning; mammals; dog; muscle; upper airways; hyoepiglotticus; soft palate; respiratory-related muscle activity;

D O I：

10.1016/0034-5687(96)00029-1

中图分类号：

Q4 [生理学];

学科分类号：

071003 ;

摘要：

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.

引用

页码：169 / 177

页数：9

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