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The pressure in the aorta, brachial artery and other large arteries rises to a peak value (Systolic pressure) and falls to a minimum value (Diastolic pressure) during each cardiac cycle. The blood pressure is written as systolic over diastolic pressure e.g.
Heart valves are thin flaps of tissue in the mammalian heart, which ensure unidirectional flow of blood between the four chambers during the cardiac cycle. The main valves in the human heart are tricuspid valve, mitral valve, pulmonary valve, and aortic valve.
SIMPSON method was used to gain LVEDV, LVESV, LVEF and other parameters according to the principle of counting-volumetric method and the count of end-systole and end diastole of cardiac cycle. Three to five milliliter fasting venous blood before treatment was drawn from the patients and determined by Baoding First Central Hospital.
During the cardiac cycle, CT interconnect with the leaflets, papillary muscles, and indirectly with the ventricular wall.
The RV function and hemodynamic parameters were significantly improved after 2 weeks, and the ratio of the tricuspid valve inflow duration and cardiac cycle significantly improved [Table 1].{Table 1}
If the depolarization coincides with sensitive time of cardiac cycle, ventricular fibrillation may be triggered.
Unlike FFR, which requires administration of the drug adenosine to maximally vasodilate the heart muscle and then measure the differences in a pressure along a blocked or narrowed artery, iFR relies on measuring the pressure during a specific point in the cardiac cycle.
Once the waveform is obtained, it can be used to assess pressure and volume changes in the heart during the cardiac cycle. The DV waveform consists of four phases, two of them seen as a peak and the other two seen as a trough.
The ECG trace is used to synchronize the cardiac cycle with cine image acquisition.
To investigate the effect of particle motion on pressure distribution and wall shear stress distribution, 500 bioparticles are injected into the LCA inflow surface at the same speed of the pulsatile velocity in the first cardiac cycle, t = 0.2s.
We hypothesize that the sheer stress generated by extreme acceleration and gravitational forces on a wire that is moving with cardiac cycle during the high-velocity rides may cause fracture even in the absence of direct physical trauma.