| Autor: |
Jin-song LI, Chun-xiao ZHANG, Hui-sheng DENG, Qiao-ying YUAN, Yong-hong JIANG, Que ZHU, Jing HUANG |
| Jazyk: |
čínština |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Medical Journal of Chinese People's Liberation Army, Vol 42, Iss 8, Pp 680-685 (2017) |
| ISSN: |
0577-7402 |
| Popis: |
Objective To explore the viscoelasticity of relaxed myocardium in vivo through indentation method with an intervention ultrasound indentation system (IUIS). Methods Old myocardial infarction (OMI) models of canine were established by ligating left anterior descending branch of coronary artery for 3 months. The indentation creep tests were used respectively in OMI group and shame group (n=8, each) by IUIS in middle and advanced diastole stage in vivo. Test data were processed with three-parameter solid viscoelasticity model, and the viscoelastic parameters, such as instantaneous elastic modulus (E1), relaxation modulus (E∞), creep elastic modulus (E2) and viscous damping coefficient (η) in normal and infarcted myocardium were obtained and compared. Results All the parameters of E1, E∞, E2 and η increased obviously in OMI group than in sham group shown as follows: 27.81±6.74kPa vs. 6.78±2.43kPa; 17.87±3.59kPa vs. 4.52±1.56kPa; 49.54±14.35kPa vs. 16.82±12.37kPa and 1.97±0.78Pa.s vs. 0.66±0.40Pa.s. The differences were statistically significant (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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