IVRT

(redirected from Isovolumic Relaxation Time)
AcronymDefinition
IVRTIsovolumic Relaxation Time
IVRTIn Vitro Release Test (drug performance test)
IVRTIntel Virus Response Team
References in periodicals archive ?
Pozzi et al found that in cirrhotic patients with tense ascites, the A wave velocity is markedly increased, the E/A ratio is markedly reduced and the deceleration time is significantly prolonged, whereas Wong et al reported prolonged isovolumic relaxation time in cirrhotic patients irrespective of the presence of ascites with significantly reduced E/A ratios only in ascitic subjects.
5 Isovolumic relaxation time (ms) 47 [+ or -] 15 Mitral E (cm/s) 61 [+ or -] 11 Mitral A (cm/s) 45 [+ or -] 10 E/A ratio 1.
MPI is calculated by dividing the sum of isovolumic contraction time (ICT) and isovolumic relaxation time (IRT ) by ejection time (ET ).
8 23 98 Fs: Fractional Shortening, EF: Ejection Fraction, E/A ratio: Early rapid filling/Atrial contraction in mitral valve blood flow, EDT: early deceleration time, IVRT: Isovolumic Relaxation Time (left ventricle) Table 3: Participants' cardiac function Frequency Percent Systolic function Normal 70 87.
In a study performed by Baysal et al (26) in 20 subjects with pediatric tumor, left ventricular isovolumic contraction time and left ventricular isovolumic relaxation time values were found to be longer in patients who received anthracycline treatment compared to the control group.
Isovolumic relaxation time was seen to gradually prolong with increase in grade of hypothyroidism.
In patients with type 1 diastolic dysfunction (relaxation abnormalities) significant prolongation of isovolumic relaxation time (IVRT), 111.
The isovolumic relaxation time (IVRT) is defined as the time interval between aortic valve closure and mitral valve opening, during which LV pressure falls without a change in volume (16).
However, in patients with prosthetic size >29mm, LV systolic and diastolic parameters worsened (LV end-diastolic dimension and LV end-systolic dimension resulted to be higher and isovolumic relaxation time to be more prolonged as compared with patients with smaller size valve).
These include early diastolic transmitral velocity (E), late diastolic transmitral velocity (A) recorded at the tips of mitral valve from an apical four-chamber view, early filling deceleration time (DT), isovolumic relaxation time (IVRT) and duration of A wave (4).