First-line evaluation of coronary artery disease with coronary calcium scanning or exercise electrocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Diagnostic Testing

Background:

• Conventional angiography and CTA for obstructive coronary artery disease (CAD) are accurate but costly and involve radiation/contrast risks.
• Exercise electrocardiography (X-ECG) and coronary calcium scanning (CCS) offer less invasive, cheaper alternatives for ruling out obstructive CAD.

Purpose of the Study:

• To compare the accuracy of CCS and X-ECG in excluding obstructive CAD in patients presenting with stable chest pain.
• To evaluate the cost-effectiveness and non-invasive nature of CCS and X-ECG compared to traditional methods.

Main Methods:

• A study involving 791 consecutive stable chest pain patients in a rapid-access clinic.
• Patients underwent X-ECG and dual-source CTA with CCS; Duke pre-test probability classified risk into low, intermediate, and high.
• Obstructive CAD was defined as >50% stenosis by conventional angiography (CAG) or CTA, with CAG results being definitive.

Main Results:

• No coronary calcium was found in 4% of patients with obstructive CAD, versus 23% with a normal X-ECG (p<0.001).
• CCS demonstrated significantly lower likelihood ratios for obstructive CAD compared to X-ECG across all risk groups.
• CCS was feasible in 100% of patients, while X-ECG was diagnostic in only 59% (p<0.001).

Conclusions:

• Coronary calcium scanning (CCS) is a dependable initial diagnostic tool for ruling out obstructive CAD in real-world patients with stable chest pain.
• CCS can be successfully performed in nearly all patients, making it a highly practical and reliable option for initial assessment.