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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. Wiggers diagram - Wikipedia

    en.wikipedia.org/wiki/Wiggers_diagram

    A Wiggers diagram modified from [1]. A Wiggers diagram, named after its developer, Carl Wiggers, is a unique diagram that has been used in teaching cardiac physiology for more than a century.

  4. 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]

  5. Portal vein - Wikipedia

    en.wikipedia.org/wiki/Portal_vein

    On Doppler ultrasonography, the main portal vein (MPV) peak systolic velocity normally ranges between 20 cm/s and 40 cm/s. [9] A slow velocity of <16 cm/s in addition to dilatation in the MPV are diagnostic of portal hypertension.

  6. 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.

  7. Strain rate imaging - Wikipedia

    en.wikipedia.org/wiki/Strain_rate_imaging

    In ultrasound it is usually measured from the velocity gradient SR = (v 2 - v 1)/L where v 2 and v 1 are the myocardial velocities at two different points, and L is the instantaneous distance between them. This is thus equivalent to the velocity difference per length unit (the spatial derivative of velocity) and has the unit s −1. Strain is ...

  8. Ejection fraction - Wikipedia

    en.wikipedia.org/wiki/Ejection_fraction

    Modalities applied to measurement of ejection fraction is an emerging field of medical mathematics and subsequent computational applications. The first common measurement method is echocardiography, [7] [8] although cardiac magnetic resonance imaging (MRI), [8] [9] cardiac computed tomography, [8] [9] ventriculography and nuclear medicine (gated SPECT and radionuclide angiography) [8] [10 ...

  9. Twin anemia-polycythemia sequence - Wikipedia

    en.wikipedia.org/wiki/Twin_anemia-polycythemia...

    Doppler ultrasound abnormalities demonstrating an increased peak systolic velocity in the middle cerebral arteries (MCAPSV) in the donor twin and a decreased MCA-PSV in the recipient twin can be used to make an antenatal diagnosis of TAPS.