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Updated: May 16, 2025
Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Visual ordinal grading of aortic valve calcification on routine non-gated chest CT predicts prognosis and alters
Samuel G S Gunning1, John Graby2,3, Yashesh Mody2
1Department of Anaesthetics, Royal United Hospitals Bath NHS Foundation Trust, Avon, UK.
Insights
Aortic valve calcification (AVC) on chest CTs is linked to aortic stenosis (AS) and predicts mortality. Severe AVC independently predicts all-cause mortality, supporting its reporting in clinical practice.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Clinical Outcomes Research
Background:
- Current guidelines recommend reporting aortic valve calcification (AVC) on all chest CT scans.
- The clinical and prognostic significance of AVC detection on routine chest CTs remains uncertain.
Purpose of the Study:
- To assess the frequency, severity, and association of AVC with aortic stenosis (AS) on echocardiography.
- To evaluate the prognostic implications of AVC, including its association with all-cause mortality.
Main Methods:
- Retrospective analysis of 1377 chest CTs from January to December 2015.
- AVC and coronary artery calcification (CAC) were graded for severity.
- Echocardiography reports within 5 years were reviewed for AS; clinical outcomes were recorded.
Main Results:
- AVC was present in 25% of patients, increasing with age and more prevalent in males.
- 16% of patients with AVC had AS on echocardiography; AVC sensitivity and specificity for AS were 91% and 70%.
- AVC independently predicted all-cause mortality (53% incidence), with severe AVC showing a significant association (HR 1.56).
Conclusions:
- Aortic valve calcification (AVC) is associated with aortic stenosis (AS) and is an independent predictor of all-cause mortality.
- These findings support reporting AVC, particularly severe AVC, as a prognostic marker in routine chest CTs.
- Further validation in prospective cohorts is needed to refine clinical practice guidelines.
Objective:
BSCI/BSTI guidelines recommend reporting aortic valve calcification (AVC) on all chest CTs regardless of indication. We assessed AVC frequency, severity, and association with aortic stenosis (AS) on echocardiography and its prognostic implications.
Methods:
Retrospective, single-centre analysis of consecutive chest CTs (January-December 2015) for 200 patients per age group (< 40, 40-49, 50-59, 60-69, 70-79, 80-89, ≥ 90) performed for medical, surgical, and oncological indications. CTs were re-reviewed for the presence and graded severity of AVC and coronary artery calcification (CAC). Corresponding echocardiography reports (within 5 years) reviewed for AS. Comorbidities and clinical outcomes were recorded.
Results:
One thousand three hundred seventy-seven patients were included (mean age 64 ± 20 years, 55% female). AVC was present in 25% (350/1377) and was more prevalent in males (p < 0.001). Frequency and severity increased with age (p < 0.001). 38% (524/1377) had an echocardiogram (median inter-test interval 4.3 months [IQR 0.4-17.5]). Sixteen per cent (29/178) with AVC had AS of any severity (8% [15/178] mild; 8% [14/178] moderate; 0% [0/178] severe). Sensitivity and specificity for AVC predicting AS were 91% and 70%, respectively. Extrapolating findings, 8% of individuals with AVC and without an echocardiogram may have undiagnosed AS. All-cause mortality occurred in 53% (734/1377), which AVC predicted independently of CAC and age (p < 0.001). Adjusting for confounders, severe AVC predicted all-cause mortality (HR 1.56 [1.10-2.22], p = 0.013).
Conclusions:
AVC identified AS in 16% of patients. Additionally, severe AVC is an independent predictor of all-cause mortality in multivariable analysis. Validation in a prospective cohort is required to inform clinical practice guidelines.
Key Points:
Question New guidelines recommend reporting AVC on all non-gated chest CTs, the prognostic and clinical relevance of which is uncertain. Findings There are associations between visually quantified AVC, AS on echocardiography, and all-cause mortality in an unselected population referred for routine chest CT. Clinical relevance These results support the reporting of all severities of AVC, especially severe AVC, as a prognostic marker in all age groups. The clinical implications require further clarification in a prospective cohort.
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