PISA
Pronunciation: PIE-sah
Also written as: PISA — Proximal Isovelocity Surface Area
A quantitative echocardiographic method used to calculate mitral regurgitation severity by measuring flow convergence.
Full Definition
PISA (Proximal Isovelocity Surface Area) is an echocardiographic technique that quantifies mitral regurgitation severity by measuring the hemispheric flow convergence zone proximal to the regurgitant orifice. The method calculates regurgitant volume and effective regurgitant orifice area based on the continuity equation. It is considered the gold standard for quantifying mitral regurgitation in clinical practice. PISA measurements require careful optimization of color Doppler settings and precise measurement of the convergence radius.
Usage
Usage note: Always capitalize as PISA; often used with specific measurements (e.g., PISA radius, PISA-derived EROA).
In Context
- "The PISA method revealed severe mitral regurgitation with an effective regurgitant orifice area of 0.4 cm²." — Echocardiography report
- "Optimize color Doppler settings to clearly visualize the PISA hemisphere before measurement." — Technical protocol