Version 2.77

Part Description

LP230000-4   Phase entropy
Phase analysis of the timing of myocardial contraction is used in nuclear cardiology to quantify regional ventricular wall motion and evaluate certain conditions, including bundle branch block, ventricular pacing, and pre-excitation syndromes. Phase and amplitude together are used to classify wall motion, which is also a measure of cardiac dyssynchrony.
The phase value is defined as the amount of shift in the sine or cosine curve (measured in degrees) using the fundamental frequency of the Fourier fitting, and all of the individual phase values are used together to create a phase histogram in order to see the distribution pattern of phase values. Separate histograms are created for the rest and stress portions of the study.
Multiple parameters are calculated from the histogram:
1. Phase maximum (degrees);
2. Phase mean (degrees);
3. Phase standard deviation (degrees);
4. Phase bandwidth, which is defined as 95% of the histogram width (degrees); and
5. Phase entropy, which is an index of disorder reported on a scale of 0-1 (0-100%), with 0 meaning complete order and 1 meaning complete disorder.
PMID: 26860109 Source: Regenstrief LOINC, PMID: 26860109

Fully-Specified Name

Component
Phase entropy^resting
Property
Score
Time
Pt
System
Heart.ventricle.left
Scale
Qn
Method
NM.SPECT

Additional Names

Short Name
Phase entropy Resting Score LV SPECT

Basic Attributes

Class
CARD.PROC
Type
Clinical
First Released
Version 2.58
Last Updated
Version 2.58
Order vs. Observation
Observation

Member of these Panels

LOINC Long Common Name
82654-5 Cardiac nuclear imaging SPECT panel

Language Variants Get Info

Tag Language Translation
es-MX Spanish (Mexico) Entropía de fase ^ reposo:Puntaje:Punto temporal:Corazón.ventrículo.izquierdo:Cuantitativo:NM.SPECT
it-IT Italian (Italy) Fase di entropia^riposo:Punteggio:Pt:Cuore.ventricolo.sinistro:Qn:NM.SPECT
Synonyms: Procedure cardiache Punto nel tempo (episodio) SPECT Ventricolo cardiaco Ventricolo cardiaco Sinistro
zh-CN Chinese (China) 相位熵^静息:评分:时间点:心脏.心室.左侧:定量型:NM.SPECT
Synonyms: L LT 休息;休息状态;静息状态 分值;得分;分数 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 向左 向左侧 左 左侧（Left，LT，L） 左向 左心室;心.室.左侧;心.心室.左侧;心脏.室.左侧 左边 心 心.室;心.心室;心室;心脏.室 心脏病学 时刻;随机;随意;瞬间 核医学方法;核医学设备;nuclear medicine 核医学方法;核医学设备;nuclear medicine;单光子发射计算机断层扫描;single photon emission computed tomography;SPECT;单光子发射计算机断层显像;单光子发射断层扫描;发射计算机断层术;放射性核素扫描;同位素发射计算机辅助断层显像;Emission Computed tomography;ECT 相位（时相、相、期、分期、时段）熵（熵值、紊乱程度、有序程度、无序程度）

Example Units

Unit Source
{score} 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=82638-8