Effect of imaging angle on the color Doppler imaged vena contracta: An in vitro study
نویسندگان
چکیده
منابع مشابه
the effect of e-64 on the developmental competence of sheep cocs during in vitro maturation
in the present study, the effect of e-64 at different concentrations (0.5, 1, 5 and 10 µm) added to (1) the ivm medium on oocyte nuclear maturation and developmental competence of ovine oocytes, and (2) to the ivc medium on embryonic development of ovine embryos were investigated.
Assessment of severity of aortic regurgitation using the width of the vena contracta: A clinical color Doppler imaging study.
BACKGROUND The width of the vena contracta (VC-W), the smallest area of regurgitant flow, reflects the degree of valvular regurgitation and is measurable by color Doppler imaging, but this method has not been validated in aortic regurgitation (AR). METHODS AND RESULTS We prospectively examined 79 patients with isolated AR and 80 patients without regurgitation. The VC-W was measured from the l...
متن کاملQuantification of tricuspid regurgitation by measuring the width of the vena contracta with Doppler color flow imaging: a clinical study.
OBJECTIVE We sought to evaluate the vena contracta width (VCW) measured using color Doppler as an index of severity of tricuspid regurgitation (TR). BACKGROUND The VCW is a reliable measure of mitral and aortic regurgitation, but its value in measuring TR is uncertain. METHODS In 71 consecutive patients with TR, the VCW was prospectively measured using color Doppler and compared with the re...
متن کاملAssessment of aortic regurgitation by transesophageal color Doppler imaging of the vena contracta: validation against an intraoperative aortic flow probe.
OBJECTIVES This study was performed to validate the accuracy of color flow vena contracta (VC) measurements of aortic regurgitation (AR) severity by comparing them to simultaneous intraoperative flow probe measurements of regurgitant fraction (RgF) and regurgitant volume (RgV). BACKGROUND Color Doppler imaging of the vena contracta has emerged as a simple and reliable measure of the severity ...
متن کاملthe effect of traffic density on the accident externality from driving the case study of tehran
در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1996
ISSN: 0735-1097
DOI: 10.1016/s0735-1097(96)81830-4