Cardiac function, fiber shortening, and dynamic geometry.

R M Heethaar; C R Mol; K Elshuraydeh; J Heethaar; J T van Dort; G W Bastianen; J H Sneek; C Borst; F L Meijler

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PubMed · 6181356

Cardiac function, fiber shortening, and dynamic geometry.

R M Heethaar·C R Mol·K Elshuraydeh·J Heethaar·J T van Dort·G W Bastianen·J H Sneek·C Borst·F L Meijler

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Abstract

Many models for the study of the pump function of the heart emphasize the importance of cardiac geometry and detailed dimensional data. Because of the lack of accurate measuring techniques, approximate geometries such as shells of revolution have been applied. In this study, methods are presented that measure the dynamic geometry of the working, isolated canine heart by means of ultrasound-velocity tomography techniques. In addition, cardiac dimensions, intramural deformations, and fiber shortening have been measured dynamically in the in situ canine heart throughout the cardiac cycle with implanted radiopaque markers and biplane roentgen techniques. Results of regional contraction and relaxation patterns are presented. Epicardial fiber shortening between apex and base were computed and found to be dependent on the duration of the preceding RR interval.

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Animals Cardiac Complexes, Premature Dogs Heart Mathematics Models, Biological Myocardial Contraction Radionuclide Imaging Tomography, X-Ray Computed Ultrasonics Journal Article

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R M Heethaar, C R Mol, K Elshuraydeh, J Heethaar, J T van Dort, G W Bastianen, J H Sneek, C Borst, F L Meijler. 1982. Cardiac function, fiber shortening, and dynamic geometry.. https://pubmed.ncbi.nlm.nih.gov/6181356/

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