نتایج جستجو برای: doppler
تعداد نتایج: 45904 فیلتر نتایج به سال:
Background: Arteriovenous fistula is an important method for hemodialysis and prediction of fistula function and failure rate and access is crucial. This study was performed to determine the association between Doppler ultrasonography findings with function and failure and access rate of fistula. Methods: In this observational comparative cross-sectional study, out of 108 patients requiring fi...
in this paper, by considering a squint angle for synthetic aperture radar in the strip-map mode, a method is proposed for estimating parameters of a fixed acceleration moving target. non-zero doppler centroid and range-azimuth coupling in the squint mode add complexity to estimation equations of moving target parameters and cause doppler ambiguity. this, in turn, causes to lose the efficiency o...
In this study, trans-pulmonic valvular gradient of 51 patients with congenital pulmonary stenosis measured by CW-Doppler and cardiac catheterization were compared to find whether they are comparable and if Doppler method is accurate enough for interventional decision-making. Results showed that findings in both methods were comparable and Doppler method is accurate and enough for clinical decis...
background: the p ulsatility index (pi) shows continuous blood flow to the end organs and is a significant factor believed to decrease in aortic coarctation. correction of this factor is of great importance in the treatment of stenotic lesions of the aorta. however, there are minimal data regarding the trend of changes in the pi after stent implantation. furthermore, the association between the...
background: the evaluation of prosthetic valves is very difficult with two-dimensional transthoracic echocardiography alone. doppler and color flow imaging as well as transesophageal echocardiography are more reliable to detect prosthetic valve dysfunction. however, doppler study sometimes tends to be misleading due to the load-depending characteristics of peak and mean pressure gradients. the ...
Background and Purpose: UTI is one of the most common bactctrial infections in pediatrics. Febrile urinary tract infection can produce severe renal complications when unrecognized or untreated. Acute pyelonephritis (APN) and reflux are two synergistic factors in the destruction of kidneys of children. There are no certain specific diagnostic laboratory tests and clinical symptoms for diagnosi...
Turkmen horse is one of the oldest and purest breeds in the world, but there is no information on Doppler echocardiographic parameters in this horse. In the present study, pulsed-wave (PW) Doppler echocardiography was performed on 42 clinically normal 3- to 15-year-old racing Turkmen horses. No cardiac disease was detected with two-dimensional (2-D) real-time, M-mode, and colour flow mapping. D...
background: the incidence of stroke is 2.1-5.2% in bypass surgery patients with a mortality of 0-38%. this study was designed to evaluate the incidence of significant carotid artery stenosis and its related risk factors in candidates for coronary artery bypass graft (cabg) surgery. methods: 1045 consecutive candidates for cabg underwent carotid artery doppler examination in a prospective study....
Objective- to determine the range of systolic times intervals using Pulsed-wave Doppler and m-mode echocardiography in normal, healthy Great Dane dogs. Design- Descriptive study. Animals- Thirty healthy Great Dane dogs. Procedures- This study examined 30 clinically healthy Great Dane dogs by the twodimensional, M-mode and Pulsed-wave Doppler echocardiography. The dogs were awake and unsedated. ...
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