Chest wall motion during epidural anesthesia in dogs.
Chest wall motion during epidural anesthesia in dogs.
复制标题
狗硬膜外麻醉期间的胸壁运动。
DOI：
10.1152/jappl.1991.70.2.539
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Rehder,K
中科院分区：
文献类型：
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作者：
Warner,DO;Brichant,JF;Ritman,EL;Rehder,K
为了确定安静呼吸时胸腔和腹肌对呼气肌活动的相对贡献，我们对6只戊巴比妥钠麻醉的狗进行腰硬膜外麻醉，使其仰卧，使腹肌麻痹，而使胸腔肌肉运动功能基本完好。高速x射线扫描仪（动态空间重构器）提供了胸部的三维图像。呼气肌活动对潮汐呼吸的贡献是通过比较放松呼吸暂停和呼气结束时的胸壁结构来评估的。我们发现，在吸气过程中，大约一半的胸容积变化是由呼气肌活动引起的。腹肌麻痹对大多数狗的呼吸模式几乎没有影响，包括呼气肌活动对潮汐呼吸的贡献。我们得出的结论是，尽管在戊巴比妥麻醉的狗仰卧时，胸腔和腹部肌肉都有一致的阶段性呼气电活动，但在安静呼吸时，胸腔肌肉是机械上最重要的呼气肌肉。
To determine the relative contribution of rib cage and abdominal muscles to expiratory muscle activity during quiet breathing, we used lumbar epidural anesthesia in six pentobarbital sodium-anesthetized dogs lying supine to paralyze the abdominal muscles while leaving rib cage muscle motor function substantially intact. A high-speed X-ray scanner (Dynamic Spatial Reconstructor) provided three-dimensional images of the thorax. The contribution of expiratory muscle activity to tidal breathing was assessed by a comparison of chest wall configuration during relaxed apnea with that at end expiration. We found that expiratory muscle activity was responsible for approximately half of the changes in thoracic volume during inspiration. Paralysis of the abdominal muscles had little effect on the pattern of breathing, including the contribution of expiratory muscle activity to tidal breathing, in most dogs. We conclude that, although there is consistent phasic expiratory electrical activity in both the rib cage and the abdominal muscles of pentobarbital-anesthetized dogs lying supine, the muscles of the rib cage are mechanically the most important expiratory muscles during quiet breathing.