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  2. Hemodynamics of the aorta - Wikipedia

    en.wikipedia.org/wiki/Hemodynamics_of_the_Aorta

    The mean velocity in the aorta varies over the cardiac cycle. During systole the mean velocity rises to a peak, then it falls during diastole. This pattern is repeated with each squeezing pulse of the heart. The highest velocities are found at the exit of the valve during systole.

  3. Hemodynamics - Wikipedia

    en.wikipedia.org/wiki/Hemodynamics

    One parameter to quantify this difference is the pulsatility index (PI), which is equal to the difference between the peak systolic velocity and the minimum diastolic velocity divided by the mean velocity during the cardiac cycle. This value decreases with distance from the heart. [20]

  4. E/A ratio - Wikipedia

    en.wikipedia.org/wiki/E/A_ratio

    The E/A ratio is the ratio of the early (E) to late (A) ventricular filling velocities. In a healthy heart, the E velocity is greater than the A velocity. In certain conditions, especially ventricular hypertrophy, and with aging, the left ventricular wall can become stiff, increasing the back pressure as it fills, which slows the early (E ...

  5. Pressure–volume loop analysis in cardiology - Wikipedia

    en.wikipedia.org/wiki/Pressure–volume_loop...

    The slope of ESPVR (Ees) represents the end-systolic elastance, which provides an index of myocardial contractility. The ESPVR is relatively insensitive to changes in preload, afterload, and heart rate. This makes it an improved index of systolic function over other hemodynamic parameters like ejection fraction, cardiac output, and stroke volume.

  6. Cerebrospinal fluid flow MRI - Wikipedia

    en.wikipedia.org/wiki/Cerebrospinal_Fluid_Flow_MRI

    In PC-MRI, the quantitative analysis of stroke volume, mean peak velocity, and peak systolic velocity is possible only in the plane that is perpendicular to the unidirectional flow. Additionally, it is not possible to calculate multidirectional flow in multiaxial planes in 2D or 3D PC-MRI.

  7. Tissue Doppler echocardiography - Wikipedia

    en.wikipedia.org/wiki/Tissue_Doppler...

    Single spectral tissue velocity curve from the mitral annulus. The curve shows velocities towards the probe (positive velocity) in systole, and away from the probe (negative velocities) in diastole. The most useful measures are the peak velocities, in systole S' and in early diastole (e') and late diastole during atrial contraction (a').

  8. Aortoiliac occlusive disease - Wikipedia

    en.wikipedia.org/wiki/Aortoiliac_occlusive_disease

    The physical examination usually shows weakened femoral pulses and a reduced ankle-brachial index. The diagnosis can be verified by color duplex scanning, which reveals either a peak systolic velocity ratio ≥2.5 at the site of stenosis and/or a monophasic waveform.

  9. Electrical cardiometry - Wikipedia

    en.wikipedia.org/wiki/Electrical_Cardiometry

    The ratio of applied current and measured voltage equals the conductivity (or bioimpedance), which is recorded over time. [2] The steep increase in conductivity seen beat to beat is attributed to the orientation of red blood cells. The time when the slope is most steep is directly related to the peak aortic blood acceleration.