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Performance of the coronary calcium score in an outpatient chest pain clinic and strategies for risk stratification.


ABSTRACT:

Background

Coronary artery calcium score (CAC) is an objective marker of atherosclerosis. The primary aim is to assess CAC as a risk classifier in stable coronary artery disease (CAD).

Hypothesis

CAC improves CAD risk prediction, compared to conventional risk scoring, even in the absence of cardiovascular risk factor inputs.

Methods

Outpatients presenting to a cardiology clinic (n = 3518) were divided into two cohorts: derivation (n = 2344 patients) and validation (n = 1174 patients). Adding logarithmic transformation of CAC, we built two logistic regression models: Model 1 with chest pain history and risk factors and Model 2 including chest pain history only without risk factors simulating patients with undiagnosed comorbidities. The CAD I Consortium Score (CCS) was the conventional reference risk score used. The primary outcome was the presence of coronary artery disease defined as any epicardial artery stenosis?50% on CT coronary angiogram.

Results

Area under curve (AUC) of CCS in our validation cohort was 0.80. The AUC of Models 1 and 2 were significantly improved at 0.88 (95%CI 0.86-0.91) and 0.87 (95%CI 0.84-0.90), respectively. Integrated discriminant improvement was >15% for both models. At a pre-specified cut-off of ?10% for excluding coronary artery disease, the sensitivity and specificity were 89.3% and 74.7% for Model 1, and 88.1% and 71.8% for Model 2.

Conclusion

CAC helps improve risk classification in patients with chest pain, even in the absence of prior risk factor screening.

SUBMITTER: Huang W 

PROVIDER: S-EPMC7852173 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Publications

Performance of the coronary calcium score in an outpatient chest pain clinic and strategies for risk stratification.

Huang Weiting W   Lim Leon Ming Hsien LMH   Aurangzeb Amirzeb S/O AS   Wong Cheney Jianlin CJ   Koh Natalie Si Ya NSY   Huang Zijuan Z   Teo Hooi Khee HK   Chua Terrance Siang Jin TSJ   Tan Swee Yaw SY  

Clinical cardiology 20210112 2


<h4>Background</h4>Coronary artery calcium score (CAC) is an objective marker of atherosclerosis. The primary aim is to assess CAC as a risk classifier in stable coronary artery disease (CAD).<h4>Hypothesis</h4>CAC improves CAD risk prediction, compared to conventional risk scoring, even in the absence of cardiovascular risk factor inputs.<h4>Methods</h4>Outpatients presenting to a cardiology clinic (n = 3518) were divided into two cohorts: derivation (n = 2344 patients) and validation (n = 1174  ...[more]

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