Quantitative three-dimensional evaluation of myocardial perfusion during regadenoson stress using multidetector...

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Diagnostics

Background:

• Multidetector computed tomography (MDCT) is explored for evaluating myocardial perfusion abnormalities.
• Assessing coronary stenosis and its hemodynamic significance is crucial for clinical management.
• The potential of MDCT to detect stress-induced perfusion deficits requires further investigation.

Purpose of the Study:

• To test if quantitative 3D analysis of MDCT myocardial perfusion during regadenoson stress improves detection of significant coronary artery disease (CAD).
• To compare the diagnostic accuracy of stress-enhanced MDCT with resting MDCT for CAD detection.

Main Methods:

• Prospective study of 47 patients undergoing CT coronary angiography (CTCA) and regadenoson stress MDCT.
• Quantitative 3D analysis software calculated a perfusion abnormality index (Qh) for myocardial segments.
• Comparison of Qh with stenosis severity on CTCA and perfusion defects at rest versus stress.

Main Results:

• Regadenoson stress resulted in a significant reduction in myocardial attenuation in segments with >50% stenosis (P < 0.05).
• The perfusion abnormality index (Qh) was significantly higher during regadenoson stress compared to rest (P < 0.05).
• Addition of regadenoson stress improved diagnostic sensitivity for CAD from 0.57 to 0.91 and accuracy from 0.65 to 0.77.

Conclusions:

• Quantitative 3D analysis of MDCT images enables objective detection of coronary artery disease (CAD).
• Incorporating regadenoson stress significantly enhances the accuracy of MDCT in diagnosing CAD.