IVRTIsovolumic Relaxation Time
IVRTIn Vitro Release Test (drug performance test)
IVRTIntel Virus Response Team
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References in periodicals archive ?
The results of Pearson's correlation coefficient in asthmatic patients revealed a positive correlation between IRCT-echo, IACT-echo, and MPI (r=0.35, P=0.004; and r=0.52, P=0.008, respectively) and also between IRCT-echo, IACT-echo, and IVRT (r=0.46, P=0.003; and r=0.58, P=0.008, respectively).
However, compared to control subjects, patients had higher LVMI value, indicating myocardial hypertrophy, and lower E/A ratio, higher IVRT values and prolonged mitral DcT, indicating impaired diastolic function and increased CA-IMT and higher EFT.
The draft guidance, issued 28 December 2016, allows IVRT, a measure of release of the active pharmaceutical ingredient from the drug product matrix in a controlled laboratory environment, to be used in conjunction with skin tests using cadaver skin membrane.
Additionally, patients in group B had lower IVRT and higher E wave DT than patients without LVH.
According to these parameters, patients were further classified as having normal diastolic function when E/A ratio >1, DT <220 ms, and IVRT <100 ms.
In the PCOS group, the A wave, DT, and IVRT were significantly higher than in the controls (p < 0.05), while Em and the E/A ratio were considerably lower in the PCOS group (p = 0.001 and p = 0.001, respectively).
Diastolic function, expressed as isovolumetric relaxation time (IVRT), and the ratio of the maximal early diastolic peak velocity (E)/the late peak velocity (A) in milliseconds were modified by the I/R procedure.
The recordings across the MV orifice cAVC and developing were also used to evaluate the embryonic heart rate (HR) in beats per minute (BPM), cardiac cycle length (RR interval), diastolic ventricular filling time (DFT; 12.5 dpc, n = 11,14.5 dpc, n = 17, and 17.5 dpc, n = 16), ejection time (ET; 12.5 dpc, n = 11, 14.5 dpc, n = 17, and 175 dpc, n = 16), isovolumetric contraction time (IVCT; 12.5 dpc, n = 7,14.5 dpc, n = 17, and 17.5 dpc, n = 16), and isovolumetric relaxation time (IVRT; 12.5 dpc, n = 7,14.5 dpc, n = 17, and 175 dpc, n = 16) of the LV (Figure 1(a)).
The LV diastolic function has been evaluated using the Pulse Wave (PW) Doppler transmitral flow applied in a 4-chamber apical view where the E and A wave velocities, E/A ratio, deceleration time (DT) and isovolumetric relaxation time (IVRT) were calculated.
The later parameter is calculated as: MPI= (IVRT+IVCT)/ET, in which, IVRT is Isovolumic Relaxation Time, IVCT is Isovolumic Contraction Time and ET is ejection time.
We measured left ventricle Ejection Fraction (EF) and Fractional Shortening (FS) to survey left ventricle systolic function, and left ventricle Isovolumic Relaxation Time (LV IVRT) and also Early rapid filling/Atrial contraction (E/A ratio) in mitral valve blood flow to survey left ventricle diastolic function.