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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...
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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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A Noncontrast CMR Risk Score for Long-Term Risk Stratification in Reperfused ST-Segment Elevation Myocardial

Heerajnarain Bulluck1, Jaclyn Carberry2, David Carrick3

  • 1British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, Scotland; University of East Anglia, Norwich, United Kingdom; Leeds University and Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom.

JACC. Cardiovascular Imaging
|March 11, 2022
PubMed
Summary
This summary is machine-generated.

A new noncontrast cardiovascular magnetic resonance (CMR) risk score effectively predicts major adverse cardiac events in ST-segment elevation myocardial infarction (STEMI) patients. This score stratifies patients into low, intermediate, and high-risk groups for better prognostic assessment.

Keywords:
ST-segment elevation myocardial infarctioncardiac magnetic resonancerisk

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Area of Science:

  • Cardiovascular Imaging and Diagnostics
  • Cardiac MRI
  • Acute Coronary Syndromes

Background:

  • A novel cardiovascular magnetic resonance (CMR) risk score was developed to assess prognosis in ST-segment elevation myocardial infarction (STEMI) patients.
  • The score incorporates left ventricular ejection fraction (LVEF), myocardial infarct (MI) size, and microvascular obstruction (MVO) or intramyocardial hemorrhage (IMH).

Purpose of the Study:

  • To compare the prognostic value of a noncontrast CMR risk score against established scores for predicting adverse cardiac events.
  • To evaluate the ability of the CMR score to risk-stratify STEMI patients.

Main Methods:

  • Three CMR-based risk scores were developed and compared, including variations with MVO and IMH, alongside the GRACE score.
  • A derivation cohort (370 patients) and a validation cohort (234 patients) were utilized.
  • Performance was assessed using C-statistics for 1-year composite outcomes and Kaplan-Meier curves for 5-year outcomes.

Main Results:

  • The CMR risk scores demonstrated comparable or superior performance to the GRACE score in predicting 1-year composite endpoints (C-statistics ranging from 0.82 to 0.83 vs. 0.74).
  • Score 3, utilizing LVEF and IMH, showed excellent discrimination (C-statistic 0.87) and calibration in the validation cohort.
  • Kaplan-Meier analysis identified distinct risk groups: high-risk (LVEF ≤45%), intermediate-risk (LVEF >45% and IMH), and low-risk (LVEF >45% and no IMH) with significant differences in 5-year cumulative events.

Conclusions:

  • The noncontrast CMR risk score, particularly Score 3, offers robust prognostic value for STEMI patients, comparable to existing scores.
  • This CMR score effectively stratifies patients into low, intermediate, and high-risk categories based on LVEF and IMH, aiding clinical decision-making.
  • The findings support the use of noncontrast CMR for risk stratification after STEMI.