BackgroundUnstable angina (UA) is a common cause of hospital admission; risk
stratification helps determine strategies for treatment.ObjectiveTo determine the applicability of two-dimensional longitudinal strain (SL2D)
for the identification of myocardial ischemia in patients with UA.MethodsCross-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.ResultsThe 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).ConclusionThere 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.
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