Hall L W, Aziz H A, Groenendyk J, Keates H, Rex M A
School of Veterinary Science, University of Queensland, St Lucia, Australia.
Res Vet Sci. 1991 May;50(3):328-33. doi: 10.1016/0034-5288(91)90133-9.
To investigate activity in respiratory muscles, insulated wire electrodes were used to record electromyographic activity in the costal diaphragm and in the intercostal, serratus ventralis, internal abdominal oblique, transversalis and rectus abdominis muscles in conscious horses and in the same animals when anaesthetised. Electromyographic activity was related to respiratory phases as recorded by a stethograph around the chest wall. The costal diaphragm showed tonic and inspiratory activity in both conscious and anaesthetised animals. The principal muscle actively involved in expiration was the transversalis muscle. Intercostal muscle activity, and any increased activity in the second part of either inspiration or expiration recorded in the conscious animal, was absent under anaesthesia. The very marked tonic activity found in the serratus ventralis muscle in standing horses disappeared during anaesthesia. It was concluded that any stabilisation of the chest wall contributed by activity in the serratus ventralis and intercostal muscles in conscious, standing horses is greatly reduced during anaesthesia.
为研究呼吸肌的活动，采用绝缘线电极记录清醒马匹以及同一批马匹麻醉状态下肋膈膜、肋间肌、腹侧锯肌、腹内斜肌、腹横肌和腹直肌的肌电活动。肌电活动与通过胸壁听诊器记录的呼吸阶段相关。在清醒和麻醉动物中，肋膈膜均表现出紧张性和吸气活动。主动参与呼气的主要肌肉是腹横肌。麻醉状态下，肋间肌活动以及清醒动物吸气或呼气第二阶段记录到的任何增加的活动均消失。站立马匹腹侧锯肌中发现的非常明显的紧张性活动在麻醉期间消失。得出的结论是，清醒站立马匹中腹侧锯肌和肋间肌活动对胸壁的任何稳定作用在麻醉期间会大大降低。
