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- W3913488 abstract "A number of important differences can be found between the left ventricle (LV) and right ventricle (RV) of the heart under physiological conditions. In anatomy, the most important is probably the architecture of the atrioventricular valve and its annulus. The LV has a mitral valve (with two cusps) and a firm annulus, while the RV has a tricuspid valve with a greater total area, but relatively small cuspid areas, and an elastic annulus. The difference in the blood supply is important. Owing to high intramural pressure, the coronary flow in the wall of the LV occurs only during the diastole; in the RV it is limited only in the presence of a significant increase in intracavitary pressure. The LV myocardium is functionally accustomed to short-term marked changes in the systolic load (in extreme static exercise the arterial pressure rises for a short time to three times the normal value), while the RV is adapted to changes in the diastolic load (marked filling changes associated with deep breathing, for instance). The difference in the response to a long-term volume load is difficult to evaluate: between a defect of the interatrial septum and aortic insufficiency there are too many differences. A long-term pressure load seems to be tolerated better by the right ventricle: patients with severe pulmonary stenosis and a pressure six times higher than the physiological value have lived 25 years and patients with isolated corrected L-transposition of the great arteries can reach 35 years without any signs of impaired RV function.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W3913488 date "1991-01-01" @default.
- W3913488 modified "2023-09-23" @default.
- W3913488 title "Heterogeneity of the myocardium. Function of the left and right ventricle under normal and pathological conditions." @default.
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