Version 2.78

Description

The Proximal Isovelocity Surface Area (PISA) method is based on convergent flow dynamics and the Continuity Principle. Proximal to the orifice, flow converges in hemispheric layers of equal velocity. The flow rate across any of these hemispherical isovelocity surfaces is equal to the area of the surface (which can be calculated from its radius) multiplied by the flow velocity at the surface. Choosing a PISA velocity equal to the aliasing velocity of the system is an easy way to visualize an isovelocity surface (which will appear as the surface where the Doppler color switches between red and blue) and measure the corresponding PISA radius from the center of the orifice to the surface. The Continuity Principle states that in the absence of a leak or additional flow into a conduit, the flow rate will be constant along the length of the conduit, whether the conduit is the heart or the regurgitant jet. So the flow rate through the regurgitant orifice is the same as the flow rate across the PISA surface. Dividing the flow rate by the peak velocity through the orifice (measured using continuous wave Doppler of the regurgitant jet) provides the effective regurgitant orifice area (EROA). Source: DICOM

Basic Part Properties

Part Display Name
PISA radius during diastole
Part Type
Component (Describes the core component or analyte measured)
Created On
2015-11-17
Construct for LOINC Short Name
PISA radius dias

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=LP203206-0

Language Variants Get Info

Tag Language Translation
zh-CN Chinese (China) PISA 半径.舒张期
Synonyms: PISA 半径（半径范围、半径长度）.舒张期（心脏舒张期、心舒期）;舒张期（心脏舒张期、心舒期）过程中（当中、期间）的PISA 半径（半径范围、半径长度）;近端等速表面积;近端等速表面积法;近心端等速表面积;Proximal Isovelocity Surface Area;PISA;PISA法;血流汇聚法
it-IT Italian (Italy) Raggio PISA.diastole
Synonyms: Raggio PISA durante diastole