Results 151 to 160 of about 353,576 (201)

MR imaging of regional cardiac function: Low‐pass filtering of wall thickness curves

Magnetic Resonance in Medicine, 1995
AbstractWall thickness curves (WTCs) derived from MR images are subject to considerable measurement error. This study determines the effects of low‐pass Fourier filtering of WTCs on functional parameters derived from the curve: peak rate of wall thinning (PRWT) and time to PRWT (TPRWT).
H J, Lamb, R R, Singleton, R J, van der Geest, G M, Pohost, A, de Roos   +4 more
openaire   +2 more sources

Cardiac Output Response to Norepinephrine in Postoperative Cardiac Surgery Patients

Critical Care Medicine, 2013
We studied the variable effects of norepinephrine infusion on cardiac output in postoperative cardiac surgical patients in whom norepinephrine increased mean arterial pressure. We hypothesized that the directional change in cardiac output would be determined by baseline cardiac function, as quantified by stroke volume variation, and the subsequent ...
Maas, J.J., Pinsky, M.R., Wilde, R.B. de, Jonge, E. de, Jansen, J.R.   +4 more
openaire   +3 more sources

Influence of pregnancy on mean systemic filling pressure and the cardiac function curve in guinea pigs

Canadian Journal of Physiology and Pharmacology, 1992
To assess the degree of circulatory fullness and to evaluate the influence of peripheral and cardiac factors in the regulation of cardiac output during pregnancy, the following studies were conducted using pentobarbital-anesthetized, open-chest nonpregnant and late term pregnant guinea pigs.
S C, Cha, G W, Aberdeen, B S, Nuwayhid, E W, Quillen   +3 more
openaire   +2 more sources

Bedside Assessment of Total Systemic Vascular Compliance, Stressed Volume, and Cardiac Function Curves in Intensive Care Unit Patients

Anesthesia & Analgesia, 2012
Mean systemic filling pressure (Pmsf) can be measured at the bedside with minimally invasive monitoring in ventilator-dependent patients using inspiratory hold maneuvers (Pmsf(hold)) as the zero flow intercept of cardiac output (CO) to central venous pressure (CVP) relation.
Maas, J.J., Pinsky, M.R., Aarts, L.P., Jansen, J.R.   +3 more
openaire   +3 more sources

Nonparametric comparison of two tests of cardiac function on the same patient population using the entire ROC curve

Proceedings. Computers in Cardiology 1988, 2003
Typically a diagnostic algorithm based on a cardiac-function test uses a threshold on a parameter to separate normal from diseased patients. This threshold may be determined through discriminant analysis or through a fixed choice of sensitivity or specificity.
G. Campbell, M.A. Douglas, J.J. Bailey
openaire   +1 more source

Ventricular function curves from the cardiac response to angiographic contrast: A sensitive detector of ventricular dysfunction in coronary artery disease

American Heart Journal, 1974
Abstract Fifty cardiac catheterizations were performed in 44 patients undergoing evaluation for coronary artery disease. Ventricular function curves (VFC) were constructed by plotting the left ventricular end-diastolic pressure (LVEDP) and stroke work index (SWI) before and three to four minutes after a standard left ventricular angiogram.
B H, Brundage, M D, Cheitlin
openaire   +2 more sources

Relationship between exercise capacity and cardiac diastolic function assessed by time–volume curve from 16-frame gated myocardial perfusion SPECT

Annals of Nuclear Medicine, 2010
Echocardiographic studies have suggested an association between diastolic dysfunction and exercise intolerance. The aim of this study was to examine the relationship between exercise capacity and left ventricular (LV) function during stress myocardial scintigraphy, and to investigate whether or not this relationship is caused by ischemia during ...
Tomohide, Yoshino, Ichiro, Nakae, Tetsuya, Matsumoto, Kenichi, Mitsunami, Minoru, Horie   +4 more
openaire   +2 more sources

Estimation of organ input function and plasma clearance from the cardiac curve in dynamic scintigraphy

European Journal of Nuclear Medicine, 1992
A theoretical description of the relationship between the count rate detected in the cardiac region of interest and the arterial organ input function in dynamic scintigraphy is presented. It is shown that, provided the time-activity curve for the heart is corrected for extra-cardiac and unlabelled activity, it is proportional to the arterial organ ...
openaire   +2 more sources

Estimation of the left ventricular diastolic function with cardiac MDCT: Correlation of the slope of the time-enhancement-curve with the mitral annulus diastolic velocity

European Journal of Radiology, 2012
Patients with diastolic heart failure tend to have a poor outcome, similar to that for patients with systolic heart failure. The aim of this study was to explore the ability of MDCT to estimate the left ventricular diastolic function. Thirty patients with suspected coronary artery disease underwent MDCT and echocardiography.
Takehiro, Nakahara, Masahiro, Jinzaki, Nobuaki, Fukuda, Yasuyuki, Takahashi, Toshihiro, Ishihara, Atsuko, Takada, Kenichi, Suzuki, Mamoru, Manita, Tetsurou, Imanari, Norio, Kanesawa, Sachio, Kuribayashi, Masahiko, Kurabayashi   +11 more
openaire   +2 more sources

Non-invasive quantification of cerebral blood flow for rats by microPET imaging of 15O labelled water: the application of a cardiac time???activity curve for the tracer arterial input function

Nuclear Medicine Communications, 2005
In-vivo quantitative cerebral blood flow (CBF) measurement using positron emission tomography (PET) has typically employed invasive arterial blood sampling procedure to determine the arterial input function (AIF). The present study was performed to provide a non-invasive quantitative CBF measurement technique for rats using a dedicated animal PET.CBF ...
Seong-Hwan, Yee, Paul A, Jerabek, Peter T, Fox   +2 more
openaire   +2 more sources