Elastic properties of the human chest during cardiopulmonary resuscitation

J. E. Tsitlik, M. L. Weisfeldt, N. Chandra, M. B. Effron, H. R. Halperin, H. R. Levin

Research output: Contribution to journalArticlepeer-review

Abstract

Sternal displacement during CPR was measured in 11 adults and 2 manikins (Recording Resusci Anne) while the chest was compressed with variable maximum pulse compression force at a rate of 60/min with compression duration of 0.5-0.6 sec. In 10 patients, the pulsatile sternal elastic characteristic can be satisfactorily described with a 2nd degree polynomial F = βD(s) + γ D2(s), where β = 54.9 ± 29.4 (mean ± SD) N/cm is the pulsatile initial elasticity and γ = 10.8 ± 4.1 N/cm2 is the posterior resiliency. The sternal characteristics of manikins were linear F = kD(s) with high elasticity constants, k = 131 and 142 N/cm. Therefore, the manikins tested differ significantly in elasticity characteristics from the human chest during resuscitation. In general, the manikin: (1) has markedly greater stiffness at the onset of compression, and (2) maintains a linear stiffness throughout the usual range of displacement, rather than becoming stiffer with greater chest displacement.

Original languageEnglish (US)
Pages (from-to)685-692
Number of pages8
JournalUnknown Journal
Volume11
Issue number9
DOIs
StatePublished - Jan 1 1983

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

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