Assessment of fetal left cardiac isovolumic relaxation time in appropriate and small-for-gestational-age fetuses [PDF]
Ultrasound in Medicine & Biology, 1995 Left ventricular isovolumic relaxation time was studied in 22 appropriate-for-gestational-age fetuses (AGA, 26–40 wk) and 12 small-for-gestational-age fetuses (SGA, 29–37 wk).
Malkin, E. (Elissa) +2 more
core +11 more sources
Assessment of left ventricular relaxation by Doppler echocardiography. Comparison of isovolumic relaxation time and transmitral flow velocities with time constant of isovolumic relaxation. [PDF]
Circulation, 1990 Isovolumic relaxation time (IVRT) and events of early transmitral flow measured by Doppler echocardiography were validated against the time constant of left ventricular relaxation (tau) in open-chest dogs. During increased inotropy (by isoproterenol infusion) at constant preload, enhancement of relaxation was indicated by a decrease in tau from 48 ...
Otto A. Smiseth, Y Myreng
semanticscholar +5 more sources
Usefulness of right ventricular isovolumic relaxation time in predicting systolic pulmonary artery pressure [PDF]
European Journal of Echocardiography, 2008 Systolic pulmonary artery pressure (sPAP) cannot always be assessed from Doppler-detected tricuspid regurgitation (TR), especially when sPAP is normal. The right ventricular isovolumic relaxation time (rIVRT) is related to sPAP, and assessment of rIVRT by tissular Doppler imaging (rIVRT') has recently been proposed as an alternative method for ...
Laetitia Gambotti +3 more
semanticscholar +5 more sources
Reliable measurement methods for the isovolumic relaxation time: comparisons of dual gate Doppler and seven other methods. [PDF]
J Echocardiogr, 2023 Abstract Purpose Isovolumic relaxation time (IVRT) is a useful indicator of diastolic dysfunction. However, a measurement method for IVRT has not been established. The Dual Gate Doppler method, which can record two separate pulse-wave Doppler signals simultaneously using two sample gates, may be ideal for measuring IVRT.
Kimura N +9 more
europepmc +5 more sources
Discrepancies in the measurement of isovolumic relaxation time: a study comparing M mode and Doppler echocardiography. [PDF]
Heart, 1990 Mitral valve cusp separation on M mode echogram, the mitral valve opening artefact, and the onset of forward transmitral flow recorded by Doppler echocardiography have all been taken to mark the end of isovolumic relaxation, while its onset has been taken either as the aortic closure sound (A2) recorded phonocardiographically or the aortic closure ...
D G Gibson +3 more
semanticscholar +6 more sources
Relation of left ventricular isovolumic relaxation time and incoordination to transmitral Doppler filling patterns [PDF]
Heart, 1992 To investigate factors during isovolumic relaxation that determine Doppler filling patterns in patients with left ventricular disease, and thus to identify the underlying mechanisms.85 patients (50 ischaemic heart disease, 35 left ventricular hypertrophy due to aortic stenosis) and 26 controls were studied with Doppler and M mode echocardiography and ...
Chiang H Lee +2 more
semanticscholar +4 more sources
Japanese Circulation Journal, 1983 The effect of diltiazem on left ventricular isovolumic relaxation time was examined in 11 patients with hypertrophic obstructive and non-obstructive cardiomyopathy in a combined study using phonocardiograms and echocardiograms. Five to 10 min after intravenous injection of diltiazem (0.2 mg/kg, body weight), a prolonged isovolumic left ventricular ...
Hirofumi Yasue +3 more
semanticscholar +6 more sources
Influence of sotalol on the time constant of isovolumic left ventricular relaxation in anesthetized dogs [PDF]
American Journal of Veterinary Research, 1999 Abstract Objective To determine the effects of various doses of sotalol on myocardial relaxation in healthy dogs. Animals 12 healthy adult mixed-breed dogs anesthetized with thiopental and α-chloralose. Procedures Left ventricular pressure (LVP), aortic pressure, and aortic flow velocity were measured. The time constant of isovolumic relaxation (τ)
R W, Seidler +3 more
openaire +3 more sources
The Egyptian Heart Journal, 2014 Assessment of usefulness of right ventricular isovolumic relaxation time measured by Tissular Doppler imaging in predicting systolic pulmonary artery pressure. Methods: 30 patients, 10 males and 20 females were included in the study. The mean age was (43.
Mohamed Salem El-Baz +2 more
doaj +3 more sources
Normal Values of Isovolumic Relaxation Time (IVRT) in a Pediatric Population, Contrasted with Patients with Dilated Cardiomyopathy [PDF]
Pediatric Research, 1999 Normal Values of Isovolumic Relaxation Time (IVRT) in a Pediatric Population, Contrasted with Patients with Dilated ...
Kristi Cooper +3 more
openaire +3 more sources