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Author Spotlight: Advancing Cardiovascular Imaging - Introducing the Spatially Weighted Calcium Score for Early Disease Detection
Published on: September 22, 2023
Coronary artery calcium score: Current status of clinical application and how to handle the results
Yasuyuki Suzuki1, Naoya Matsumoto1, Shunichi Yoda2
1Department of Cardiology, Nihon University Hospital, Tokyo, Japan.
Insights
The coronary artery calcium score (CACS) is a valuable tool for assessing coronary artery disease (CAD) risk. However, the prognostic significance of moderate CACS values and its combination with other imaging techniques remains debated.
Area of Science:
- Cardiology
- Radiology
- Preventive Medicine
Background:
- The coronary artery calcium score (CACS) has been recognized for its clinical utility since 1990 as a less invasive and costly alternative to coronary CT angiography.
- Despite its established role, ongoing discussions address optimal patient selection and interpretation of CACS results for coronary artery disease (CAD) assessment.
- Previous studies often used a CACS cutoff of 400 for significant CAD or cardiac event risk, but emerging evidence suggests increasing risks even with mild to moderate scores.
Purpose of the Study:
- To evaluate the prognostic significance of moderate CACS values (1-400) in predicting cardiac events and guiding management.
- To explore the utility of combining CACS with noninvasive cardiac imaging and pretest probability assessments.
- To clarify the role of CACS in primary prevention and statin therapy management.
Main Methods:
- Review of existing literature and clinical studies on CACS interpretation and prognostic value.
- Analysis of CACS thresholds and their correlation with significant ischemia, CAD likelihood, and cardiac event rates.
- Examination of guidelines and recommendations regarding CACS assessment and its integration with clinical information and noninvasive imaging.
Main Results:
- While CACS=0 is associated with a decreased likelihood of CAD, its prognostic impact with statin therapy is not definitively established.
- Guidelines from 2016 classify CACS ≥300 as indicating a moderate to severely increased risk.
- The prognostic value of moderate CACS (1-400) remains uncertain, with increasing event rates observed across this spectrum.
- Combining CACS with pretest clinical information (age, sex, symptoms) and noninvasive cardiac imaging is recommended for comprehensive risk assessment.
Conclusions:
- The clinical utility of CACS in CAD management and primary prevention is reconfirmed.
- The prognostic implications of moderate CACS values and their optimal use in conjunction with noninvasive imaging and treatment strategies require further investigation.
- Standardized approaches for patient eligibility and result interpretation for CACS are still evolving.
Abstract:
The clinical significance of the coronary artery calcium score (CACS) has been discussed since Agatston et al. first reported its utility in 1990. CACS is less invasive and less expensive than contrast-enhanced coronary computed tomography (CT) angiography. However, to date, discussion continues on who is eligible for CACS assessment and how test results should be handled. Although the CACS cutoff value of 400 has been used in many previous studies for the detection of significant coronary artery disease (CAD) or cardiac event risk, other studies have reported that the frequency of significant ischemia, likelihood of CAD, and cardiac event rate are increasing, from mild to moderate CACS. The prognostic significance of patients with moderate CACS (1-400) is still uncertain, whereas in 2016, the Society of Cardiovascular CT and Society of Thoracic Radiology guidelines determined CACS ≥300 as moderate to severely increased risk. Another important value is CACS = 0. It is known that CACS = 0 decreases the likelihood of CAD after assessment of the pretest probability. In addition, management using statin therapy is a clinical situation that may benefit from CACS = 0. A previous study reported no significant difference in the prognosis between patients with and without statin therapy with CACS = 0. Some studies have reported the significance of the combination of CACS and noninvasive cardiac imaging, whereas CACS assessment is recommended for use in combination with risk assessment of pretest probability using clinical information including age, sex, and chest symptoms. While the utility of CACS in the management of CAD and primary prevention has been reconfirmed, the benefit of moderate values of CACS to predict prognosis with subsequent treatment and noninvasive cardiac imaging is still controversial.
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