Mitral regurgitation (MR) severity is routinely assessed by Doppler color flow mapping, which is subject to technical and hemodynamic variables. Vena contracta width may be less influenced by hemodynamic variables and has previously been shown to correlate with angiographic estimates of MR severity. This study was performed to compare mitral vena contracta width by multiplane transesophageal ec...

OBJECTIVES The purpose of the present study was to validate a newly developed three-dimensional (3D) digital color Doppler method for quantifying pulmonary regurgitation (PR), using an animal model of chronic PR. BACKGROUND Spectral Doppler methods cannot reliably be used to assess pulmonary regurgitation. METHODS In eight sheep with surgically created PR, 27 different hemodynamic states we...

BACKGROUND Pulmonary regurgitation is a common and clinically important residual lesion after repair of tetralogy of Fallot. Cardiovascular magnetic resonance (CMR) phase contrast velocity mapping is widely used for measurement of pulmonary regurgitant fraction. Breath-hold acquisitions, usually acquired during held expiration, are more convenient than the non-breath-hold approach, but we hypot...

In the present work, a numerical simulation of two parallel turbulent jets was performed. The simulations were carried out by using the  standard, the  standard and the RSM models. A parametric study was also presented to determine the effect of the nozzles spacing and velocity ratio on the axial and transverse positions of the merge and combined points. Correlations between the various paramet...

The purpose of the present study was to evaluate Doppler echocardiography for the detection of pulmonary hypertension in high-altitude inhabitants. In total, 60 (55 male) patients aged 18-71 yrs were recruited from an ECG screening programme applied to 1,430 inhabitants living at an altitude of 2,500-3,600 m in Kyrgyzstan. Of these, 44 met ECG criteria for right ventricular hypertrophy. All und...

numerous investigations have been devoted towards understanding the hydrodynamics of gas jets in fluidized beds. however, most of them address the problem from  macroscopic point of view, which does not reveal the true behavior in the jet region at the single particle level. the present work aims to understand the jet behavior from a more fundamental level, i.e. the individual particle level. a...

OBJECTIVES This study examined the influence of regurgitant volume on pulmonary venous blood flow patterns in an animal model with quantifiable mitral regurgitation. BACKGROUND Systolic pulmonary venous blood flow is influenced by atrial filling and compliance and ventricular output and by the presence of mitral regurgitation. The quantitative severity of the regurgitant volume itself is diff...

BACKGROUND Pulmonary hypertension (PH) is common in heart failure patients. Literature on PH in heart failure is sparse in Nigeria. This study was carried out to determine the prevalence of PH in heart failure patients and ascertain the relationship between left ventricular systolic and diastolic function and the degree of PH. METHODS A total of 125 heart failure patients had echocardiography...

n August 2003, a 44-year-old woman suffering from postpartum dilated cardiomyopathy was referred to our coronary care unit with the complaint of sudden-onset dyspnea. She had been monitored since 1995 because of a diagnosis of primary antiphospholipid antibody syndrome. On admission to our hospital, the patient was in respiratory distress, severely cyanotic and hypotensive. Upon physical examin...