Accuracy of flow rate calculation in funnel orifices by color Doppler zero-shift “proximal isovelocity surface area” method
نویسندگان
چکیده
منابع مشابه
Doppler color flow "proximal isovelocity surface area" method for estimating volume flow rate: effects of orifice shape and machine factors.
Previously described Doppler color flow mapping methods for estimating the severity of valvular regurgitation have focused on the distal jet. In this study, a newer Doppler color flow technique, focusing on the flow proximal to an orifice, was used. This method identifies a proximal isovelocity surface area (PISA) by displaying an aliasing interface. Volume flow rate (cm3/s) can be calculated a...
متن کاملQuantitative, noninvasive assessment of patent ductus arteriosus shunt flow by measuring proximal isovelocity surface area on color Doppler imaging.
BACKGROUND We evaluated the hemodynamic status of patent ductus arteriosus (PDA) by measuring vena contracta width (VCW) and effective shunt orifice area (ESOA) using proximal isovelocity surface area (PISA) on color Doppler imaging. METHODS AND RESULTS: Study subjects were 21 patients with PDA (mean age, 3.6 years). We measured VCW (mm/m(2)) and ESOA (cm(2)) by the PISA method using echocardio...
متن کاملQuantitative, non-invasive assessment of ventricular septal defect shunt flow by measuring proximal isovelocity surface area on colour Doppler mapping.
OBJECTIVE To determine whether the proximal isovelocity surface area (PISA) method could be applied to estimate the magnitude of ventricular septal defect (VSD) shunt flow. DESIGN Prospective analysis of clinical, echocardiographic, and angiographic data. SETTING University hospital. PATIENTS 14 children with VSD. METHODS Colour Doppler images of VSD shunt flow were obtained in paraster...
متن کاملEffective mitral regurgitant orifice area: clinical use and pitfalls of the proximal isovelocity surface area method.
OBJECTIVES We attempted to determine the accuracy and pitfalls of calculating the mitral regurgitant orifice area with the proximal isovelocity surface area method in a clinical series that included patients with valvular prolapse and eccentric jets. BACKGROUND The effective regurgitant orifice area, a measure of lesion severity of mitral regurgitation, can be calculated by the proximal isove...
متن کاملShould clinical cardiologists incorporate the proximal isovelocity surface area (PISA) method into their ever enlarging armamentarium?
Should clinical cardiologists incorporate the proximal isovelocity surface area (PISA) method into their ever enlarging armamentarium? This issue contains a paper comparing measurement of ventricular septal defect shunt ratio by a proximal iso-velocity surface area technique (usually abbreviated as PISA) method and by the Fick method.' The authors used some shortcuts in the PISA method, perhaps...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1991
ISSN: 0735-1097
DOI: 10.1016/0735-1097(91)91560-2