CT Coronary Angiogram: Diagnostic Capabilities and Clinical Applications

Primary Diagnostic Indications

• The American College of Radiology recommends CT coronary angiography (CCTA) for symptomatic patients with chest pain and intermediate pre-test probability of coronary artery disease (CAD) to diagnose or exclude obstructive disease 2, 3
• The European Society of Cardiology suggests considering CCTA as an alternative to invasive coronary angiography in patients without prior CAD history who present with chest pain and inconclusive diagnostic assessment 3, 4
• CCTA is appropriate for ruling out CAD in low-risk patients before valve surgery, according to the European Society of Cardiology 3

Diagnostic Performance and Limitations

• The American Heart Association notes that CCTA demonstrates 90-95% or greater sensitivity and specificity for occlusive CAD with current multidetector technology 4
• The European Heart Journal reports that CCTA has an excellent negative predictive value—if no calcified or non-calcified plaque is found, it is highly unlikely that symptoms are due to atherosclerotic coronary disease 4
• The American College of Cardiology states that the positive predictive value of CCTA is lower because it provides anatomic information without functional or physiological assessment of ischemia 4

Technical Considerations and Integration with Other Testing

• The European Society of Cardiology recommends functional imaging (stress echocardiography, stress MRI, SPECT, or PET) when CCTA shows stenosis of uncertain functional significance 6
• The American Heart Association suggests that invasive coronary angiography with fractional flow reserve (FFR) measurement is indicated when functional imaging is positive or symptoms are severe and refractory to medical treatment 6
• The European Heart Journal notes that coronary artery calcium (CAC) scoring on non-contrast CT can be performed before CCTA to assess atherosclerotic burden 1, 8