isovolumic


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isovolumic

[¦ī·sō¦väl·yə·mik]
(physics)
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The maximum change of LV pressure during isovolumic contraction (LV + dP/dt max) and relaxation (LV - dP/dt max) was calculated from the LV pressure traced with a resistance-capacitance analog differentiator and the LV systolic pressure.
LVEDD: left ventricular end-diastolic diameter, LVESD: left ventricular end-systolic diameter, EF: ejection fraction, FS: fractional shortening, IVSWT: interventricular septal wall thickness, LVPWT: left ventricular posterior wall thickness, LVMI: left ventricular mass index, E/A: ratio of mitral E-to mitral A-wave peak velocity, IVRT: isovolumic relaxation time, DcT: deceleration time, EFT: epicardial fat thickness, NS: non-signifcant, CA-IMT: carotid artery intima-media thickness Table 4.
Shortening of the papillary muscle throughout left ventricular isovolumic relaxation may contribute to mitral valve opening, while elongation of the papillary muscle during late diastole permits closure of the mitral valve leaflet.
The use of isovolumic contraction velocity to determine right ventricular state of contractility and filling pressures: a pulsed Doppler tissue imaging study.
The isovolumic contraction time (IVCT: interval between the end of the A' wave and the beginning of the S' wave) and the isovolumic relaxation time (IVRT: interval between the end of the S' wave and the beginning of the E' wave) were measured for both sides of the mitral annulus and lateral side of the tricuspid annulus on the tissue Doppler.
The same trend was reported regarding LV isovolumic relaxation time (IVRT) [14], and it seems that both E-DecTand IVRT have a positive correlation with AHI [9].
The mitral valve inflow pattern (E wave, A wave, E-wave deceleration time, E/A ratio, and isovolumic relaxation time) was measured by pulsed wave Doppler.
The myocardial performance index (Tei index) is an echocardiographic/Doppler index that combines systolic and diastolic function and is calculated as isovolumic relaxation time plus isovolumic contraction time divided by ejection time.
Isovolumic relaxation time was shorter than 70 ms, and the deceleration time of peak E reduced significantly (<150 ms).
Early detection of right ventricular systolic dysfunction by using myocardial acceleration during isovolumic contraction in patients with mitral stenosis.
Transmitral spectral Doppler often shows restrictive filling pattern (accentuated early diastolic velocity with low or absent late filling velocity with E/A ratio > 2, E wave deceleration time < 150 ms, and short isovolumic relaxation time < 60 ms, Figure 1(c)) although this is commonly a sign of advanced myocardial involvement.
In addition, the LV pressure for the normal condition with LAAO cannulation did not exceed the aortic pressure, which created isovolumic contraction and trapped the blood in the LV.