Respiratory reflexes evoked by tracheal distension.

Respiratory reflexes evoked by tracheal distension.
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气管扩张引起的呼吸反射。

DOI:
10.1152/jappl.1981.50.2.421
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发表时间:
1981
期刊:
Journal of applied physiology: respiratory, environmental and exercise physiology
影响因子:
--
通讯作者:
Sant'Ambrogio,G
Sant'Ambrogio,G
中科院分区:
--
文献类型:
--
作者:
Rao,SV;Sant'Ambrogio,FB;Sant'Ambrogio,G

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在13只麻醉并通过气管内导管通气的犬中,通过在吸气的前半部分内过度充气密封套囊并维持该过度充气两个呼吸周期,扩张胸内(ITT)或胸外气管(ETT)的节段。ITT扩张导致13只犬中有12只犬首次激发呼吸的呼气持续时间(TE)显著延长。ETT扩张延长TE的13只狗中只有5。在三个实验中测量了导致吸气时间缩短和膈振幅峰值(PPA)降低的吸气抑制。在另外六个实验中,膈神经放电只有短暂的减少,但立即恢复。在其余四个实验中,吸气爆发不受影响。迷走神经切断后,ITT扩张缩短TE在13只狗中的8只。ETT扩张在11个实验中的10个中无效;在其余实验中TE显著延长。ITT或ETT扩张对TI和PPA均无显著影响。这些结果可以用气管感受器的已知行为来解释,并可能表明存在过度影响。
In 13 dogs that were anesthetized and ventilated through an endotracheal tube, segments of either the intrathoracic (ITT) or extrathoracic trachea (ETT) were distended by over-inflating the sealing cuff within the first half of an inspiration and maintaining this overinflation for two breathing cycles. ITT distension caused a significant prolongation of the expiratory duration (TE) of the first challenged breath in 12 of the 13 dogs. ETT distension prolonged the TE in only 5 of the 13 dogs. An inhibition of inspiration resulting in shortened inspiratory time and reduced peak phrenic amplitude (PPA) was measured in three experiments. In six other experiments, there was only a transient decrease in phrenic discharge, which immediately resumed. In the remaining four experiments, the inspiratory burst was unaffected. After vagotomy, ITT distension shortened TE in 8 of the 13 dogs. ETT distension was ineffective in 10 out of 11 experiments; in the remaining experiment TE was significantly lengthened. No significant effects were elicited on TI and PPA by either ITT or ETT distension. These results could be explained by the known behavior of tracheal receptors and could indicate the presence of extravagal influences.
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