LOINC
Version 2.72

79946-0Aortic valve PISA velocity during diastole by US.dopplerActive

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

zh-CNChinese (China)
PISA 速度.舒张期:速度:时间点:主动脉瓣:定量型:超声.多普勒
it-ITItalian (Italy)
Velocita PISA.diastole:Vel:Pt:Valvola aortica:Qn:Eco.doppler
es-MXSpanish (Mexico)
Diástole de velocidad de PISA:Vel:Punto temporal:Valvula aortica:Cuantitativo:US.doppler

Example Units

Unit Source
cm/s Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info

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