Results 141 to 150 of about 5,283 (209)

Right ventricular myocardial isovolumic relaxation time and pulmonary pressure

Clinical Physiology and Functional Imaging, 2005
SummaryAims:  Non‐invasive assessment of pulmonary artery systolic pressure (PASP) has several limitations. As previously described by Burstin, the right ventricular (RV) isovolumic relaxation time (IVRt) is sensitive to changes in PASP. We therefore compared RV myocardial IVRt, derived by Doppler tissue imaging (DTI), with simultaneously measured ...
Per Lindqvist, Anders Waldenström, Gerhard Wikström, Elsadig Kazzam   +3 more
openaire   +2 more sources

The Evaluation of Pulmonary Hypertension Using Right Ventricular Myocardial Isovolumic Relaxation Time

Journal of the American Society of Echocardiography, 2005
Right ventricular (RV) blood pool-derived isovolumic relaxation time (IVRT) correlates well with systolic pulmonary arterial pressure (PAP). However, because of complex parameter derivation, the method is rarely used. The aim of this study was to validate the measurement of myocardial velocity imaging-derived RV IVRT (IVRT') against invasively measured
Virginija, Dambrauskaite, Marion, Delcroix, Piet, Claus, Lieven, Herbots, Tomas, Palecek, Jan, D'hooge, Bart, Bijnens, Frank, Rademakers, George R, Sutherland   +8 more
openaire   +3 more sources

Myocardial relaxation IV: mechanical determinants of the time course of left ventricular pressure decline during isovolumic relaxation

European Heart Journal, 1980
Relaxation of isolated mammalian cardiac muscle is known to be influenced by loading conditions, but the mechanical determinants of relaxation velocity in the intact heart are not well defined. Accordingly, we measured the time constant (T) of left ventricular (LV) isovolumic pressure decline during descending and ascending thoracic aorta cross-clamp ...
W H, Gaasch, A S, Blaustein, D, Adam
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Variation in Tau, the time constant for isovolumic relaxation, along the left ventricular base-to-apex axis

Basic Research in Cardiology, 1999
Tau (tau), the time constant for isovolumic relaxation, is often used as a measure of cardiac diastolic function. However, several methods of calculating tau have been published which may produce different results and, thereby, different conclusions. The purpose of this study was to determine if the method of tau calculation effects the results when ...
K L, Davis, U, Mehlhorn, E R, Schertel, H J, Geissler, D, Trevas, G A, Laine, S J, Allen   +6 more
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Relation of Isovolumic Relaxation time to Left Ventricular End-Diastolic Pressure

Clinical Science, 1981
P. J. Oldershaw, M. Mattheos, E. Shapiro, D. G. Gibson   +3 more
openaire   +2 more sources

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Isovolumic relaxation time shortens significantly during the three months after birth

Journal of the American Society of Echocardiography, 2004
Although most Doppler-derived left ventricular diastolic function parameters undergo permanent changes during growth and maturation, isovolumic relaxation time (IVRT) normalized to heart rate has a constant value from the fourth month of life through adolescence. No reference values exist for IVRT in babies less than 3 months of age.
Lothar, Schmitz, Athanasios, Xanthopoulos, Peter E, Lange   +2 more
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Left Ventricular Untwist During Isovolumic Relaxation Time in Patients with Diastolic Dysfunction

Cardiovascular Research Prove Journal, 2019
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Changes of Left Ventricular Isovolumic Relazation Time with Growth in Children

Pediatrics International, 1990
We investigated the changes of left ventricular isovolumic relazation time (LVIRT) with growth and the factors influencing them during childhood, in a 10‐year follow‐up stury.We measured the body height(BH), body weight (BW), lean body weight (LBW), heart rate (HR), Blood pressure (BP), left ventricular muscle volume index (LVMVI), and LVIRT corrected ...
Y, Hayashi, K, Watanabe, K, Kishida, N, Haneda, H, Iwatani, T, Nishio, C, Mori   +6 more
openaire   +2 more sources