Improving the diagnostic performance of the real world coronary computed tomography angiography including...

Area of Science:

• Cardiovascular imaging
• Diagnostic performance evaluation
• Medical technology assessment

Background:

• Coronary computed tomography angiography (CTA) is a key non-invasive imaging modality for coronary artery disease.
• Interpreting non-calcified segments in CTA can be challenging, impacting diagnostic accuracy.
• Standardized interpretation protocols are crucial for reliable CTA results.

Purpose of the Study:

• To evaluate the diagnostic performance of coronary CTA based on the interpretation of non-calcified uninterpretable segments.
• To determine if classifying these segments as obstructive or patent affects diagnostic accuracy.
• To identify factors, including contrast medium arrival time adjusted by heart rate (CATHR), that can improve CTA diagnostic performance.

Main Methods:

• Retrospective analysis of 268 patients undergoing coronary CTA and coronary angiography (CAG).
• Comparison of CTA diagnostic performance when non-calcified segments were interpreted as obstructive versus patent.
• Investigation of coronary risk factors and CATHR as predictors for improved CTA diagnosis.

Main Results:

• Interpreting uninterpretable segments as patent significantly improved the area under the receiver operating characteristic curve (AUC) compared to obstructive interpretation (0.79 vs 0.73, p=0.02).
• CATHR was identified as a significant predictor of CAG stenosis (odds ratio 1.13, p=0.046).
• Adding CATHR further improved the AUC to 0.82 (p=0.003), with enhanced accuracy, sensitivity, specificity, and negative predictive value.

Conclusions:

• Determining non-calcified uninterpretable segments as patent enhances coronary CTA diagnostic performance.
• Incorporating CATHR into the analysis further improves diagnostic accuracy and specificity.
• These findings support refined interpretation strategies for non-calcified segments in coronary CTA.