Version 2.78

Part Description

LP203312-6   Effective orifice area.systole
Cardiac valve area can be measured (orifice area) or indirectly calculated (effective orifice area). Direct measurement can be done on echo, and calculations are based on other measurements such as blood flow volume and velocity. [DICOM] The effective orifice area is calculated based on the equation F=A×V, where F is flow, A is area and V is velocity. The velocity is measured directly with Doppler echo and indirectly during cardiac catheterization based on the Torricelli law from the transvalvular pressure gradient: V=√2gh, where g is the velocity of acceleration resulting from gravity and h is the pressure gradient. Therefore, for area as measured by cardiac catheterization, the formula is A=F/√2gh. PMID: 22547754 Source: Regenstrief LOINC, PMID: 22547754

Fully-Specified Name

Component
Effective orifice area.systole
Property
Area
Time
Pt
System
Aortic valve
Scale
Qn
Method
US.doppler+Calculated by continuity VTI

Additional Names

Short Name
AV EOA sys Continuity VTI

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) Área efectiva del orificio sístole:Zona:Punto temporal:Valvula aortica:Cuantitativo:US.doppler+Calculated by continuity VTI
it-IT Italian (Italy) Effettiva area dell'orifizio.sistole:Area:Pt:Valvola aortica:Qn:Eco.doppler+Calcolato da continuità VTI
Synonyms: DICOM Simplified Adult Echo Report concepts Eco Ecografia cardiaca Ecografia.doppler Ecografia.doppler.calcolata Punto nel tempo (episodio)
zh-CN Chinese (China) 有效口面积.收缩期:面积:时间点:主动脉瓣:定量型:超声.多普勒+连续性血流速度时间积分计算法
Synonyms: 口（孔、孔口、出口、瓣口）面积 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 孔;孔口;出口;瓣口 心脏病学 心脏病学.超声;心脏超声 心脏超声.多普勒 心脏超声.多普勒.计算法 时刻;随机;随意;瞬间 有效口（孔、孔口、出口、瓣口）面积.收缩期（心脏收缩期、心缩期） 计算;计算型方法 超声.多普勒+连续性血流速度时间积分（流速时间积分、血流速度时间积分、VTI）计算法 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 速度时间积分

Example Units

Unit Source
cm2 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=79958-5