Differential effects of desflurane and halothane on peripheral airway smooth muscle.

Differential effects of desflurane and halothane on peripheral airway smooth muscle.
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地氟烷和氟烷对周围气道平滑肌的不同影响。

DOI:
--
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发表时间:
1996
影响因子:
9.8
通讯作者:
J. Kampine
J. Kampine
中科院分区:
医学1区
文献类型:
--
作者:
A. Mazzeo;E. Cheng;Z. Bosnjak;R. L. Coon;J. Kampine

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挥发性麻醉剂已被证明对气道平滑肌有直接的松弛作用。我们研究了地氟醚和氟烷对乙酰胆碱预收缩犬近端和远端气道的影响,分别为0.9、1.9和2.8。近端和远端气道平滑肌随麻醉浓度的增加呈剂量相关放松。地氟醚仅在2.8 MAC时对近端气道的松弛作用大于氟烷。在1.9和2.8 MAC时,地氟醚对远端气道的松弛作用大于氟烷。在所有测试浓度下,远端气道平滑肌对挥发性麻醉剂的敏感性均高于氟烷或地氟醚对近端气道平滑肌。这种影响可能是由于软骨含量、肌球蛋白含量、上皮依赖效应、受体密度、肌丝对Ca2+的敏感性、肌浆网Ca2+控制或近端气道与远端气道的离子通量的差异。与氟烷相比,气道平滑肌对地氟烷的敏感性增加尚不清楚,但可能与Ca2+稳态影响的可能差异有关。
Volatile anaesthetics have been shown to have direct relaxant effects on airway smooth muscle. We have examined the effects of 0.9, 1.9, and 2.8 dog MAC of desflurane and halothane on isolated proximal and distal canine airways precontracted with acetylcholine. The proximal and distal airway smooth muscle relaxed with increasing concentration of each anaesthetic in a dose-related manner. Desflurane had a greater relaxant effect than halothane on the proximal airway only at 2.8 MAC. Desflurane relaxed the distal airway to a greater extent than halothane at 1.9 and 2.8 MAC. The distal airway smooth muscle was more sensitive to volatile anaesthetics than the proximal airway smooth muscle with either halothane or desflurane at all concentrations tested. This effect may be a result of differences in cartilage content, myosin content, epithelium-dependent effects, receptor density, myofilament sensitivity to Ca2+, sarcoplasmic reticulum Ca2+ control, or ionic fluxes in the proximal airway compared with the distal airway. The increased sensitivity of airway smooth muscle to desflurane compared with halothane is not known but may be related to possible differences in the effects of Ca2+ homeostasis.
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影响因子: 5.7
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