A5072822538- Cardiovascular Function and Risk Factors
- Congenital Heart Disease Studies
- Cardiac Valve Diseases and Treatments
- Cardiac Imaging and Diagnostics
- Cardiac Arrhythmias and Treatments
- Pulmonary Hypertension Research and Treatments
- Advanced MRI Techniques and Applications
- Ultrasound in Clinical Applications
- Cardiac Structural Anomalies and Repair
- Hemodynamic Monitoring and Therapy
- Cardiovascular and Diving-Related Complications
- Coronary Artery Anomalies
- Cardiovascular Disease and Adiposity
- Cardiovascular Issues in Pregnancy
- Cardiovascular Health and Disease Prevention
- Cardiovascular Conditions and Treatments
- Cardiomyopathy and Myosin Studies
- Ultrasound and Hyperthermia Applications
- Vascular anomalies and interventions
- Ultrasound Imaging and Elastography
- Atrial Fibrillation Management and Outcomes
- Aortic Disease and Treatment Approaches
- Cardiac pacing and defibrillation studies
- Congenital heart defects research
- Cardiac electrophysiology and arrhythmias
Oregon Health & Science University
2008-2017
Doernbecher Children's Hospital
1994-2015
Zhengzhou University
2015
University of Portland
1995-2013
Walker (United States)
2009-2013
Philips (United States)
2013
Université de Sherbrooke
2012
Toshiba (United States)
2012
Oregon Medical Research Center
1996-2012
Tohoku University
2011
Four hundred M-mode echocardiographic surveys were distributed to determine interobserver variability in measurements. This was done with a view toward examining the need and determining criteria for standardization of measurement. Each survey consisted five echocardiograms calibration marker, measured by participants anonymously. The echoes judged adequate quality measurement structures. Seventy-six 400 (19%) returned, allowing comparison as well examination which used. Mean measurements...
Imaging of the flow convergence region (FCR) proximal to a regurgitant orifice has been shown provide method for quantifying rate. According continuity principle, FCR is constituted by concentric hemispheric isovelocity surfaces centered at orifice. The rate constant across all and equals through For any surface (Q) given by: Q = 2 pi r2 Vr, where area hemisphere Vr velocity radial distance (r) from orifice.We studied 52 consecutive patients with mitral regurgitation (mean age, 49 years; age...
Heart disease remains a leading cause of death worldwide. Previous research has indicated that the dynamics cardiac left ventricle (LV) during diastolic filling may play critical role in dictating overall health. Hence, numerous studies have aimed to predict and evaluate global health based on quantitative parameters describing LV function. However, inherent complexity diastole, its electrical, muscular, hemodynamic processes, prevented development tools accurately diagnose heart failure at...
Background— The etiology of ventricular dysfunction in adult congenital heart disease (ACHD) is not well understood. Diffuse fibrosis a likely common final pathway and quantifiable using MRI. Methods Results— Patients with ACHD (n=50) were studied cardiac MRI to quantify systemic volume function diffuse fibrosis. index for single midventricular plane the ventricle was quantified by measuring T1 values blood pool myocardium before after administration gadolinium (0.15 mmol/kg) then adjusted...
We undertook a randomized, controlled trial to determine whether human surfactant administered endotracheally at birth very premature infants (gestational age, 24 29 weeks) would prevent the respiratory distress syndrome or reduce its severity. Thirty-one treated (birth weight, 938 +/- 286 g) were compared in blinded fashion with control 964 174 g). The lecithin/sphingomyelin ratio was less than 2 all infants, and phosphatidylglycerol not present amniotic fluid tracheal fluids birth,...
In this study, we explored the use of continuous wave Doppler-echocardiography guided by color Doppler flow-mapping as a method for noninvasively calculating rate pressure rise (RPR) in left ventricle. Continuous determination velocities mitral regurgitant jets allows calculation instantaneous gradients between ventricle and atrium. Left atrial variations early systole can be considered negligible; therefore, rising segment regurgitation velocity curve should reflect ventricular increase. We...
Cardiac Doppler flow velocity studies were performed in normal human fetuses between 18 and 40 weeks of gestation. Two-dimensional linear array sector scanning techniques used for the initial evaluation fetuses, which included a standard ultrasound examination to determine anatomy estimated gestational age weight. Fetal cardiac was then performed, with four-chamber, short-axis/great vessel, long-axis/left ventricular outflow tract, aortic arch views obtained. Pulsed echo instrumentation...
Recent studies suggest that maximal Doppler velocities measured within the jets form downstream from stenotic valves can be used to predict aortic valve gradients. To test whether method would useful for evaluation and management of pediatric patients with right ventricular outflow obstruction, we evaluated pulmonary artery flow before catheterization in 16 children stenosis. We a 3.5-MHz, quantitative, range-gated, two-dimensional, pulsed, echocardiographic scanner fast Fourier transform...
We developed and validated a mitral valve orifice method for Doppler cardiac output determination. In 15 open-chest dogs, was controlled measured by roller pump interposed between the right atrium pulmonary artery as right-heart bypass. Left heart flows were in dog model measurements at compared not only to volume flow pump, but electromagnetic meters well. The maximum area off short-axis two-dimensional echocardiographic views planimetry. maximal then adjusted its diastolic variation size...
We examined vena cava Doppler flow velocity tracings from 69 fetuses between 22 and 40 weeks' gestation. Twenty-three had arrhythmias. Fifteen absent end-diastolic velocities in the umbilical artery, a condition associated with intrauterine growth retardation, 15 normal artery ratios were matched by gestational age. In studies 16 additional fetuses, inferior waveforms compared superior waveforms. Peak time-velocity integrals of forward or reverse during systole, early diastole, atrial...