Coronary microcirculation in the beating heart
| Autor: | Yasuo Ogasawara, Osamu Hiramatsu, Toyotaka Yada, Masahito Kajiya, Fumihiko Kajiya, Yousuke Inai |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
medicine.medical_specialty
Beating heart Biomedical Engineering Diastole Coronary microcirculation Coronary Circulation Internal medicine Laser-Doppler Flowmetry medicine Humans Coronary hemodynamics Endocardium Cardiac cycle business.industry Microcirculation Models Cardiovascular Myocardial Contraction Computer Science Applications Coronary arteries medicine.anatomical_structure Transmural pressure cardiovascular system Cardiology Vascular Resistance business Blood Flow Velocity |
| Zdroj: | Medical & Biological Engineering & Computing. 46:411-419 |
| ISSN: | 1741-0444 0140-0118 |
| Popis: | The phase opposition of velocity waveforms between coronary arteries (predominantly diastolic) and veins (systolic) is the most prominent characteristic of coronary hemodynamics. This unique arterial and venous flow patterns indicate the importance of intramyocardial capacitance vessels and variable resistance vessels during a cardiac cycle. It was shown that during diastole the intramyocardial capacitance vessels have two functional components, unstressed volume and ordinary capacitance. Unstressed volume is defined as the volume of blood in a vessel at zero transmural pressure. In vivo observation of systolic narrowing of arterioles in mid-wall and in subendocardium indicates the increase in resistance by cardiac contraction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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