Article (Scientific journals)
Chest wall motion during epidural anesthesia in dogs.
Warner, David O; Brichant, Jean-François; Ritman, Erik L et al.
1991In Journal of Applied Physiology, 70 (2), p. 539-47
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Keywords :
Anesthesia, Epidural; Animals; Diaphragm/physiology; Dogs; Electromyography; Male; Movement/physiology; Paralysis/physiopathology; Respiratory Mechanics/physiology; Respiratory Muscles/physiology; Thorax/physiology
Abstract :
[en] 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.
Disciplines :
Anesthesia & intensive care
Author, co-author :
Warner, David O
Brichant, Jean-François ;  Université de Liège - ULiège > Département des sciences cliniques > Anesthésie et réanimation
Ritman, Erik L
Rehder, Kai
Language :
English
Title :
Chest wall motion during epidural anesthesia in dogs.
Publication date :
1991
Journal title :
Journal of Applied Physiology
ISSN :
8750-7587
eISSN :
1522-1601
Publisher :
American Physiological Society, Bethesda, United States - Maryland
Volume :
70
Issue :
2
Pages :
539-47
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 April 2009

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