The Role of Selective Multidetector Computed Tomography After a Transcatheter Aortic Valve Implant

Area of Science:

• Cardiovascular Imaging
• Prosthetic Valve Performance
• Interventional Cardiology

Background:

• Transcatheter aortic valve implantation (TAVI) is increasingly used in younger, lower-risk patients, necessitating focus on long-term prosthetic valve durability.
• Transthoracic echocardiography, while standard, may not detect early structural or geometric abnormalities like subclinical leaflet thrombosis.
• Subclinical leaflet thrombosis, characterized by hypoattenuated leaflet thickening and reduced motion, can precede overt valve dysfunction.

Purpose of the Study:

• To review the role of multimodality imaging in identifying thrombogenic valve phenotypes after TAVI.
• To propose an integrated imaging framework for post-TAVI surveillance and management.

Main Methods:

• Review of current literature on TAVI, prosthetic valve durability, and imaging modalities.
• Analysis of how prosthesis geometry influences neo-sinus flow and thrombotic substrate formation.
• Integration of transthoracic echocardiography and multidetector computed tomography (MDCT) for comprehensive assessment.

Main Results:

• Prosthesis geometry (e.g., under-expansion, ellipticity, misalignment) can alter flow and promote thrombosis.
• Multidetector computed tomography (MDCT) allows integrated assessment of leaflet morphology, thrombus, and prosthetic geometry.
• Subclinical leaflet thrombosis is a dynamic phenomenon linked to mechanical factors.

Conclusions:

• Multimodality imaging is crucial for understanding mechanical determinants of thrombosis after TAVI.
• An integrated imaging approach combining echocardiography and selective MDCT can support individualized post-TAVI surveillance.
• Early detection of thrombogenic valve phenotypes may optimize patient management and improve long-term outcomes.