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Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Coronary artery disease grading by cardiac CT for predicting outcome in patients with stable angina
Christian U Oeing1, Matthew B Matheson2, Mohammad R Ostovaneh3
1Johns Hopkins Hospital and School of Medicine, 600 N Wolfe St, Blalock 524, Baltimore, MD, USA; Deutsches Herzzentrum der Charité (DHZC), Charité - Universitätsmedizin Berlin, Department of Cardiology, Angiology and Intensive Care Medicine, Campus Virchow-Klinikum, Berlin, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany.
Insights
For patients with suspected coronary heart disease (CHD), a history of CHD is the strongest predictor of major adverse cardiovascular events (MACE). In those without prior CHD, coronary calcium scoring offers effective risk stratification.
Area of Science:
- Cardiology
- Radiology
- Medical Imaging
Background:
- Coronary atheroma burden is a key driver of major adverse cardiovascular events (MACE) in patients with suspected coronary heart disease (CHD).
- Current methods for grading coronary heart disease burden lack consensus for effective risk stratification.
- This study aimed to compare the efficacy of common CHD grading tools for symptomatic patients.
Purpose of the Study:
- To evaluate and compare the effectiveness of various coronary heart disease (CHD) grading tools in risk stratifying symptomatic patients.
- To determine the best predictors of major adverse cardiovascular events (MACE) in patients with suspected CHD.
Main Methods:
- Analysis of 5-year outcomes in 381 patients from the CORE320 multicenter study.
- Utilized baseline clinical data and cardiac CT imaging including coronary artery calcium score (CACS), percent atheroma volume, high-risk plaque, CAD-RADS, and simplified staging systems.
- Applied Cox proportional hazard models and AUC analysis to predict MACE, stratified by CHD history.
Main Results:
- Clinical characteristics were the strongest MACE predictors in the overall cohort.
- In patients without prior CHD, CACS was the sole independent MACE predictor (AUC 73%), outperforming clinical characteristics (AUC 64%).
- Simple CHD grading schemes demonstrated similar risk stratification to CAD-RADS; noncalcified plaque volume offered no additional prognostic value.
Conclusions:
- A history of CHD is the most significant predictor of MACE in patients undergoing invasive angiography.
- For patients without a history of CHD, coronary calcium scoring provides risk stratification comparable to more complex grading methods.
Background:
The coronary atheroma burden drives major adverse cardiovascular events (MACE) in patients with suspected coronary heart disease (CHD). However, a consensus on how to grade disease burden for effective risk stratification is lacking. The purpose of this study was to compare the effectiveness of common CHD grading tools to risk stratify symptomatic patients.
Methods:
We analyzed the 5-year outcome of 381 prospectively enrolled patients in the CORE320 international, multicenter study using baseline clinical and cardiac computer-tomography (CT) imaging characteristics, including coronary artery calcium score (CACS), percent atheroma volume, "high-risk" plaque, disease severity grading using the CAD-RADS, and two simplified CAD staging systems. We applied Cox proportional hazard models and area under the curve (AUC) analysis to predict MACE or hard MACE, defined as death, myocardial infarction, or stroke. Analyses were stratified by a history of CHD. Additional forward selection analysis was performed to evaluate incremental value of metrics.
Results:
Clinical characteristics were the strongest predictors of MACE in the overall cohort. In patients without history of CHD, CACS remained the only independent predictor of MACE yielding an AUC of 73 (CI 67-79) vs. 64 (CI 57-70) for clinical characteristics. Noncalcified plaque volume did not add prognostic value. Simple CHD grading schemes yielded similar risk stratification as the CAD-RADS classification. Forward selection analysis confirmed prominent role of CACS and revealed usefulness of functional testing in subgroup with known CHD.
Conclusion:
In patients referred for invasive angiography, a history of CHD was the strongest predictor of MACE. In patients without history of CHD, a coronary calcium score yielded at least equal risk stratification vs. more complex CHD grading.
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