The proximal isovelocity surface area technique: when is flow rate not equal to surface area times velocity?
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 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...
متن کاملEfficient Approaches for Quantification of Aortic Regurgitation Using Proximal Isovelocity Surface Area Process
Aortic Regurgitation is also known as Aortic Insufficiency (AI). It indicates the inability of the aortic valve. During diastole, the aortic valve allows blood flow in the reverse direction from aorta into the left ventricle. Regurgitation is due to incompetence of the aortic valve or any disorder of the valvular apparatus (e.g., leaflets, annulus of the aorta) ensuing in diastolic flow of bloo...
متن کاملProximal isovelocity surface area should be routinely measured in evaluating mitral regurgitation: a core review.
The proximal isovelocity surface area (PISA) measurement, also known as the "flow convergence" method, can be used in echocardiography to estimate the area of an orifice through which blood flows. It has many applications, but this review focuses only on its use in the intraoperative evaluation of mitral regurgitation. In that setting, PISA provides a quantitative assessment of the severity of ...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1998
ISSN: 0735-1097
DOI: 10.1016/s0735-1097(98)82054-8