Applicability of Longitudinal Strain of Left Ventricle in Unstable Angina.

Autor:	Santos NSSD; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Vilela AA; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Barretto RBM; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Vale MPD; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Rezende MO; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Ferreira MC; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Andrade AJA; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Scorsioni NHG; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Queiroga OX; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil., Bihan DL; Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil.
Jazyk:	Portuguese; English
Zdroj:	Arquivos brasileiros de cardiologia [Arq Bras Cardiol] 2018 Apr; Vol. 110 (4), pp. 354-361.
DOI:	10.5935/abc.20180062
Abstrakt:	Background: Unstable angina (UA) is a common cause of hospital admission; risk stratification helps determine strategies for treatment. Objective: To determine the applicability of two-dimensional longitudinal strain (SL2D) for the identification of myocardial ischemia in patients with UA. Methods: Cross-sectional, descriptive, observational study lasting 60 days. The sample consisted of 78 patients, of which fifteen (19.2%) were eligible for longitudinal strain analysis. The value of p < 0.05 was considered significant. Results: The group of ineligible patients presented: a lower proportion of women, a higher prevalence of diabetes mellitus (DM), use of ASA, statins and beta-blockers and larger cavity diameters. The main causes of non-applicability were: presence of previous infarction (56.4%), previous CTA (22.1%), previous MRI (11.5%) or both (16.7%) and the presence of specific electrocardiographic abnormalities (12.8%). SL2D assessment revealed a lower global strain value in those with stenosis greater than 70% in some epicardial coronary arteries (17.1 [3.1] versus 20.2 [6.7], with p = 0.014). Segmental strain assessment showed an association between severe CX and RD lesions with longitudinal strain reduction of lateral and inferior walls basal segments; (14 [5] versus 21 [10], with p = 0.04) and (12.5 [6] versus 19 [8], respectively). Conclusion: There was very low SL2D applicability to assess ischemia in the studied population. However, the global strain showed a correlation with the presence of significant coronary lesion, which could be included in the UA diagnostic arsenal in the future.
Databáze:	MEDLINE
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