Age-related changes in chest geometry during cardiopulmonary resuscitation

J. M. Dean, R. C. Koehler, C. L. Schleien, J. R. Michael, T. Chantarojanasiri, M. C. Rogers, R. J. Traystman

Research output: Contribution to journalArticle

Abstract

We studied alterations of chest geometry during conventional cardiopulmonary resuscitation in anesthetized immature swine. Pulsatile force was applied to the sternum in increments to determine the effects of increasing compression on chest geometry and intrathoracic vascular pressures. In 2-wk- and 1-mo-old piglets, permanent changes in chest shape developed due to incomplete recoil of the chest along the anteroposterior axis, and large intrathoracic vascular pressures were generated. In 3-mo-old animals, permanent chest deformity did not develop, and large intrathoracic vascular pressures were not produced. We propose a theoretical model of the chest as an elliptic cylinder. Pulsatile displacement along the minor axis of an ellipse produces a greater decrease in cross-sectional area than displacement of a circular cross section. As thoracic cross section became less circular due to deformity, greater changes in thoracic volume, and hence pressure, were produced. With extreme deformity at high force, pulsatile displacement became limited, diminishing pressure generation. We conclude that changes is chest geometry are important in producing intrathoracic intravascular pressure during conventional cardiopulmonary resuscitation in piglets.

Original languageEnglish (US)
Pages (from-to)2212-2219
Number of pages8
JournalJournal of applied physiology
Volume62
Issue number6
DOIs
StatePublished - 1987

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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  • Cite this

    Dean, J. M., Koehler, R. C., Schleien, C. L., Michael, J. R., Chantarojanasiri, T., Rogers, M. C., & Traystman, R. J. (1987). Age-related changes in chest geometry during cardiopulmonary resuscitation. Journal of applied physiology, 62(6), 2212-2219. https://doi.org/10.1152/jappl.1987.62.6.2212