Comparison of Photon-Counting and Energy-Integrating Computed Coronary Tomography Angiography for Coronary Artery Disease: A Systematic Review and Meta-Analysis.
Rakila Kurugalage, Arian Bhatia, Aditya Mukherjee et al.
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In 30 seconds
This systematic review and meta-analysis compared photon-counting detector (PCD) with energy-integrating detector (EID) CT coronary angiography in adults with stable coronary artery disease. Across 15 studies (N = 11,350), PCD-CT down-classified stenosis severity in a pooled absolute proportion of 34.2% of vessels compared with EID-CT (95% CI: 27.3-41.9; P < 0.0001). PCD-CT was also associated with fewer downstream invasive coronary angiography referrals and a higher revascularization rate among patients undergoing angiography. These findings suggest differences in diagnostic classification and subsequent care, but do not establish that PCD-CT improves clinical outcomes.
Key findings
- PCD-CT down-classified stenosis severity in 34.2% of vessels compared with EID-CT (95% CI: 27.3-41.9; P < 0.0001).
- Downstream invasive coronary angiography referrals were lower with PCD-CT (pooled OR: 0.71; 95% CI; 0.63-0.79; P < 0.0001).
- Among patients undergoing angiography, revascularization was more frequent with PCD-CT (OR: 1.43; 95% CI: 1.14-1.79; P = 0.0017).
- ICA referrals were lower with PCD-CT when CACS was <400 (OR: 0.62; 95% CI: 0.52-0.75; P < 0.0001), but the reduction was not statistically significant when CACS ≥400.
Why it matters
CT-based stenosis assessment can influence whether patients proceed to invasive angiography. The pooled findings indicate that detector type may affect stenosis classification and downstream referral patterns, with more revascularization among those who undergo angiography after PCD-CT. These results are relevant to interpreting comparative diagnostic evidence, while the abstract does not establish effects on patient-centred outcomes.
What to keep in mind
The review included 15 studies, and meta-analysis was possible only where multiple studies had compatible definitions; other outcomes were described narratively.