Version 2.77

Part Description

LP229989-1   Summed difference score.20 segment model
The summed rest score (SRS), summed stress score (SSS) and summed difference score (SDS) are variables used to measure cardiac perfusion and ischemia on cardiac SPECT studies. The SRS and SSS are calculated during the rest and stress parts of the study, respectively, and the SDS is the difference between the two.
A five-point scoring system is used to assign a perfusion value to each of the 17 or 20 myocardial segments (depending on which segmentation model is used), each of which corresponds to a coronary artery segment territory, as follows: 0 = normal tracer uptake; 1 = equivocal tracer uptake; 2 = moderate reduction in uptake; 3 = severe reduction of uptake; and 4 = absence of detectable tracer uptake. The values for all of the segments are summed, giving a total possible SRS and SSS of 68 for the 17-segment model and 80 for the 20-segment model. The sum of the differences between the score at rest and score with stress for each segment is the SDS, which represents the amount of ischemia.
The SRS, SSS and SDS can be converted to a percent of the total myocardium involved with stress, ischemic, or fixed defects by dividing the summed scores by either 68 or 80 (the maximum possible score for the 17 and 20-segment model, respectively), and multiplying by 100.
PMID: 12771008 Source: Regenstrief LOINC, PMID: 12771008

Fully-Specified Name

Summed difference score.20 segment model

Additional Names

Short Name
SDS.20 Myocardium SPECT

Basic Attributes

First Released
Version 2.58
Last Updated
Version 2.58
Order vs. 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) Puntuación de diferencia sumada Modelo de 20 segmentos:Puntaje:Punto temporal:Miocardio:Cuantitativo:NM.SPECT
it-IT Italian (Italy) Punteggio sommato differenziale.modello a 20 segmenti:Punteggio:Pt:Miocardio:Qn:NM.SPECT
Synonyms: Procedure cardiache Punteggio sommato differenziale per modello a 20 segmenti Punto nel tempo (episodio) SPECT
zh-CN Chinese (China) 总差值评分.20 节段模型:评分:时间点:心肌:定量型:NM.SPECT
Synonyms: 分值;分数;得分 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 心肌特异性;心肌的 心脏病学 总差值(心肌缺血、缺血、差异、差别、差)评分(分值、得分、分数).20 节段模型;心肌缺血总评分(总分数、总得分、总分值、总分);summed difference score;SDS 总差值(心肌缺血、缺血、差异、差别、差)评分(分值、得分、分数);心肌缺血总评分(总分数、总得分、总分值、总分);summed difference score;SDS 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

Example Units

Unit Source
{score} Example UCUM Units

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

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