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Title of Journal: J Med Syst

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Abbravation: Journal of Medical Systems

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Springer US

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1573-689X

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A Novel Nonlinear Mathematical Model of Thoracic W

Authors: Ali Jalali Allan F Simpao Vinay M Nadkarni Robert A Berg C Nataraj
Publish Date: 2016/12/17
Volume: 41, Issue: 2, Pages: 20-
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Abstract

Cardiopulmonary resuscitation CPR is used widely to rescue cardiac arrest patients yet some physiological aspects of the procedure remain poorly understood We conducted this study to characterize the dynamic mechanical properties of the thorax during CPR in a swine model This is an important step toward determining optimal CPR chest compression mechanics with the goals of improving the fidelity of CPR simulation manikins and ideally chest compression delivery in reallife resuscitations This paper presents a novel nonlinear model of the thorax that captures the complex behavior of the chest during CPR The proposed model consists of nonlinear elasticity and damping properties along with frequency dependent hysteresis An optimization technique was used to estimate the model coefficients for forcecompression using data collected from experiments conducted on swine To track clinically relevant timedependent changes of the chest’s properties the data was divided into two time periods from 1 to 10 min early and greater than 10 min late after starting CPR The results showed excellent agreement between the actual and the estimated forces and energy dissipation due to viscous damping in the late stages of CPR was higher when compared to the earlier stages These findings provide insight into improving chest compression mechanics during CPR and may provide the basis for developing CPR simulation manikins that more accurately represent the complex real world changes that occur in the chest during CPRThe research reported in this paper was supported by a grant from the National Institutes of Health No 1 R01 NS 72338 01A1 The authors express their gratitude to Dr Robert Sutton Dr Matthew Maltese Mrs Dana Niles and Dr George Bratinov at CHOP for their significant contributionsAli Jalali PhD declares that he has no conflict of interest Allan F Simpao MD MBI declares that he has no conflict of interest Vinay M Nadkarni MD declares that he has no conflict of interest Robert A Berg MD declares that he has no conflict of interest C Nataraj PhD declares that he has no conflict of interest

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