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Visual Coronary and Aortic Calcium Scoring on Chest Computed Tomography Predict Mortality in Patients With Low-Density Lipoprotein-Cholesterol ≥190 mg/dL

Originally publishedhttps://doi.org/10.1161/CIRCIMAGING.122.014135Circulation: Cardiovascular Imaging. 2022;15

Background:

Current guidelines recommend coronary artery calcium (CAC) scoring for stratification of atherosclerotic cardiovascular disease risk only in patients with borderline to intermediate risk score by the pooled cohort equation with low-density lipoprotein-cholesterol (LDL-C) of 70 to 190 mg/dL. It remains unknown if CAC or thoracic aorta calcification (TAC), detected on routine chest computed tomography, can provide further risk stratification in patients with LDL-C≥190 mg/dL.

Methods:

From a multisite medical center, we retrospectively identified all patients from March 2005 to June 2021 age ≥40 years, without established atherosclerotic cardiovascular disease and LDL-C≥190 mg/dL who had non-gated non-contrast chest computed tomography within 3 years of LDL-C measurement. Ordinal CAC and TAC scores were measured by visual inspection. Kaplan-Meier curves and multivariable Cox-regression models were built to ascertain the association of CAC and TAC scores with all-cause mortality.

Results:

We included 811 patients with median age 59 (53–68) years, 262 (32.3%) were male, and LDL-C median level was 203 (194–217) mg/dL. Patients were followed for 6.2 (3.29–9.81) years, and 109 (13.4%) died. Overall, 376 (46.4%) of patients had CAC=0 and 226 (27.9%) had TAC=0. All-cause mortality increased with any CAC and moderate to severe TAC. In a multivariate model, patients with CAC had a significantly higher mortality compared with those without CAC: mild hazard ratio (HR), 1.71 (1.03–2.83), moderate HR, 2.12 (1.14–3.94), and severe HR, 3.49 (1.94–6.27). Patients with moderate TAC (HR, 2.34 [1.19–4.59]) and those with severe TAC (HR, 3.02 [1.36–6.74]) had higher mortality than those without TAC.

Conclusions:

In patients without history of atherosclerotic cardiovascular disease and LDL-C≥190 mg/dL, the presence and severity of CAC and TAC are independently associated with all-cause mortality.

Footnotes

Continuing medical education (CME) credit is available for this article. Go to http://cme.ahajournals.org to take the quiz.

For Sources of Funding and Disclosures, see page 380.

Correspondence to: Leandro Slipczuk, MD, PhD, Montefiore Medical Center, Cardiology Division. 111 E 210th, Bronx, NY 10467. Email

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