Version 2.78

Part Description

LP229993-3   Summed stress score
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

Component
Summed stress score
Property
Prctl
Time
Pt
System
Myocardium
Scale
Qn
Method
NM.SPECT

Additional Names

Short Name
SSS Myocardium SPECT

Basic Attributes

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

Formula (Readable)

Summed stress score percentile = [Summed stress score/(4*Number of segments)]*100

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) Puntaje de estrés sumado:Prctl:Punto temporal:Miocardio:Cuantitativo:NM.SPECT
it-IT Italian (Italy) Punteggio sommato delle immagini da sforzo:Prctl:Pt:Miocardio:Qn:NM.SPECT
Synonyms: Percentile Procedure cardiache Punto nel tempo (episodio) SPECT
zh-CN Chinese (China) 总负荷评分:百分位数:时间点:心肌:定量型:NM.SPECT
Synonyms: 分值;分数;得分 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 总负荷（负荷灌注）评分（分值、得分、分数）;总负荷评分;总和负荷分数;负荷灌注总评分（总分数、总得分、总分值、总分）;summed stress score;SSS 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 百分位

Example Units

Unit Source
% 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=82648-7