LOINC
Version 2.71

79957-7Aortic valve Effective orifice area during systole (by US.doppler+Calculated by continuity Vmax)/Body surface areaActive

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/Body surface area
Property
ArArea
Time
Pt
System
Aortic valve
Scale
Qn
Method
US.doppler+Calculated by continuity Vmax

Additional Names

Short Name
AV EOA sys (Continuity Vmax)/BSA

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)
有效口面积.收缩期/体表面积:面积比:时间点:主动脉瓣:定量型:超声.多普勒+连续性最大血流速度计算法
it-ITItalian (Italy)
Effettiva area dell'orifizio.sistole/Area di superficie corporea:ArArea:Pt:Valvola aortica:Qn:Eco.doppler+Calcolato da continuità Vmax

Example Units

Unit Source
cm2/m2 Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info

https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=79957-7