Version 2.78

Part Descriptions

LP203205-2   PISA velocity.diastole
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

LP6617-7   US.doppler
Doppler ultrasound detects the shift in frequency of ultrasound signals reflected from moving objects. Conventional Doppler techniques assess the velocity of blood flow by measuring high-frequency, low-amplitude signals from small, fast-moving blood cells. PMID: 16534017 Source: Regenstrief LOINC, PMID: 16534017

Fully-Specified Name

Component
PISA velocity.diastole
Property
Vel
Time
Pt
System
Aortic valve
Scale
Qn
Method
US.doppler

Additional Names

Short Name
AV PISA velocity dias

Basic Attributes

Class
CARD.US.DICOM
Type
Clinical
First Released
Version 2.54
Last Updated
Version 2.67
Order vs. Observation
Observation

Language Variants Get Info

Tag Language Translation
es-MX Spanish (Mexico) Diástole de velocidad de PISA:Vel:Punto temporal:Valvula aortica:Cuantitativo:US.doppler
it-IT Italian (Italy) Velocita PISA.diastole:Vel:Pt:Valvola aortica:Qn:Eco.doppler
Synonyms: DICOM Simplified Adult Echo Report concepts Eco Ecografia cardiaca Ecografia.doppler Punto nel tempo (episodio) Velocità (distanza/tempo) Velocita PISA durante diastole
zh-CN Chinese (China) PISA 速度.舒张期:速度:时间点:主动脉瓣:定量型:超声.多普勒
Synonyms: PISA 速度（速率）.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 速度（速率）;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 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 心脏病学 心脏病学.超声;心脏超声 心脏超声.多普勒 时刻;随机;随意;瞬间 超声检查方法;超声检查法;超声波;超声波检查方法;超声波检查法 近端等速表面积 近端等速表面积（Proximal Isovelocity Surface Area，PISA） 速度(距离/时间);速率;速率(距离/时间)

Example Units

Unit Source
cm/s Example UCUM Units

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

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=79946-0