1 research outputs found
Cardiac function, fiber shortening and dynamic geometry
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 tadiopaque 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