Global Young's modulus of urethane plastic cast of left ventricular myocardium calculated from Roentgen angiographic silhouettes

Yenching Pao, Erik L. Ritman

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A method based on the principle of conservation of energy is proposed for the evaluation of the global Young's modulus of the left ventricular myocardium in the passive state. Left ventricular transmural pressure and chamber volume data suffice for calculation of the external work performed during diastole, while the shape and dimensions of the left ventricle (recorded as videoroentgen angiograms) provide the necessary geometric information for the approximate evaluation of the strain energies by an axisymmetric, finite-element technique. To quantitate the accuracy of the proposed method, the global Young's moduli for six urethane casts of a canine left ventricle were determined and compared with the moduli of strips of the same urethane material measured directly. Roentgen silhouettes of the casts filled with known volumes of roentgen contrast medium were recorded on videotape at various stages of inflation. The calculated global Young's modulus corresponded to within ± 15% of the 0.5 to 6.0 × 106 dyn/cm2 range of values calculated directly from the stress-strain relationship of strips of the same urethane material.

Original languageEnglish (US)
JournalJournal of Biomechanics
Volume10
Issue number2
DOIs
StatePublished - 1977

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Surgical Casts
Elastic Modulus
Urethane
Myocardium
Elastic moduli
Plastics
Heart Ventricles
Contrast media
Videotape Recording
Diastole
Economic Inflation
Ventricular Pressure
Strain energy
Contrast Media
Canidae
Conservation
Angiography

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Global Young's modulus of urethane plastic cast of left ventricular myocardium calculated from Roentgen angiographic silhouettes. / Pao, Yenching; Ritman, Erik L.

In: Journal of Biomechanics, Vol. 10, No. 2, 1977.

Research output: Contribution to journalArticle

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