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Vol.1 , No. 1, Publication Date: Jul. 7, 2014, Page: 5-10
| [1] | Mersedeh Karvandi , Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran. |
| [2] | Saeed Ranjbar , Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran. |
| [3] | Seyed Ahmad Hassantash , Modarres Hospital, Institute of Cardiovascular Research, Shahid Beheshti University of Medical Science, Tehran, Iran. |
This paper serves to study an arbitrary piece of the myocardium while is mechanically contracted, from the end-diastole to the end-systole. This finding can be posed to gain a good understanding of the local contractility, in contrast with chemical and electrical reasons of the cardiac muscle contraction. This assessment would be followed by a new notion of the power of myocytes resulting in the sufficient energy to the cardiac motion and deformation. This power was measured through 50 normal cases for each muscle volume samples in the myocardium at peak systolic. Case data included velocity, displacement, strain and strain rate. For instance, passing 0.2s from end diastole for a case in a piece with unit volume of his/her base lateral, 2.72w power is needed to get 4.5cm/s, 0.83cm, 25% and 1.85 1/s, in velocity , displacement, strain and strain rate respectively. This option is also considered as a remodeling index of the ventricles that as an example of this include due to vavular stenosis or regurgitation, coronary artery disease with associated decreased contractility and fibrosis leading to ventricular dilatation, genetic abnormalities resulting in hypertrophy, and progressive development of local fibrosis, severe hypertension, conduction abnormalities, etc. in fact this remodeling is a response to a problem with either the muscle itself or the environment in which it has to work and is an attempt to keep on fulfilling the heart's task-circulating the blood. However, since this is an abnormal situation with inherent mechanical disadvantages, in the long term, this will lead to irreversible damage to the muscle which evolves into ventricular dysfunction and heart failure. The early detection and follow-up of change in cardiac function and myocardial properties is thus of major importance.
Keywords
Myocardial Motion, Myocardial Deformation, Strain Imaging, Myofiber Mechanisms of the Myocardium
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