Angiography-based estimation of coronary physiology: A frame is worth a thousand words

Area of Science:

• Cardiology
• Medical Imaging
• Interventional Cardiology

Background:

• Fractional flow reserve (FFR) is the gold standard for assessing the hemodynamic significance of coronary artery stenosis.
• FFR-guided percutaneous coronary intervention improves clinical outcomes in coronary artery disease patients.
• Limitations of invasive FFR, including time, cost, and technical demands, hinder its widespread clinical adoption.

Purpose of the Study:

• To review current angiography-derived FFR (FFR-AD) indices for estimating coronary lesion significance.
• To highlight the differences, advantages, and disadvantages of various FFR-AD methods.
• To discuss the potential clinical implications and future directions of FFR-AD.

Main Methods:

• Review of existing literature on non-invasive FFR estimation techniques using coronary angiography.
• Analysis of methods involving 3D anatomical reconstruction from angiographic projections.
• Examination of diverse fluid dynamics computation approaches for FFR-AD.

Main Results:

• Angiography-derived FFR methods demonstrate high diagnostic accuracy compared to invasive FFR.
• Novel indices utilize 3D reconstruction and fluid dynamics to estimate lesion significance.
• Promising prognostic data exists, but large clinical outcome trials are pending.

Conclusions:

• Angiography-derived FFR presents a viable alternative to invasive FFR, overcoming its practical limitations.
• Further research, particularly large randomized trials, is needed to validate the prognostic value of FFR-AD.
• FFR-AD holds significant potential for broader application in guiding coronary revascularization decisions.