Chest wall motion during epidural anesthesia in dogs

David Oman Warner, J. F. Brichant, E. L. Ritman, K. Rehder

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)539-547
Number of pages9
JournalJournal of Applied Physiology
Volume70
Issue number2
StatePublished - 1991

Fingerprint

Epidural Anesthesia
Thoracic Wall
Abdominal Muscles
Dogs
Muscles
Respiration
Pentobarbital
Paralysis
Thorax
Three-Dimensional Imaging
Apnea
X-Rays
Rib Cage

Keywords

  • diaphragm
  • Dynamic Spatial Reconstructor
  • etidocaine
  • expiratory muscles
  • functional residual capacity
  • local anesthetics
  • rib cage
  • thoracic blood volume

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Warner, D. O., Brichant, J. F., Ritman, E. L., & Rehder, K. (1991). Chest wall motion during epidural anesthesia in dogs. Journal of Applied Physiology, 70(2), 539-547.

Chest wall motion during epidural anesthesia in dogs. / Warner, David Oman; Brichant, J. F.; Ritman, E. L.; Rehder, K.

In: Journal of Applied Physiology, Vol. 70, No. 2, 1991, p. 539-547.

Research output: Contribution to journalArticle

Warner, DO, Brichant, JF, Ritman, EL & Rehder, K 1991, 'Chest wall motion during epidural anesthesia in dogs', Journal of Applied Physiology, vol. 70, no. 2, pp. 539-547.
Warner, David Oman ; Brichant, J. F. ; Ritman, E. L. ; Rehder, K. / Chest wall motion during epidural anesthesia in dogs. In: Journal of Applied Physiology. 1991 ; Vol. 70, No. 2. pp. 539-547.
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