Cine-Computed Tomography for the Evaluation of Prosthetic Heart Valve Function

Area of Science:

• Cardiovascular Imaging
• Prosthetic Valve Evaluation
• Computed Tomography

Background:

• Suspected prosthetic valve dysfunction after aortic valve replacement (AVR) can be indicated by echocardiographic findings.
• Elevated transvalvular velocities and gradients may prompt consideration for reoperative surgery.
• 4-dimensional (space and time) image reconstruction of ECG-gated computed tomography (cine-CT) may aid in diagnosis.

Purpose of the Study:

• To evaluate the utility of cine-CT in assessing prosthetic valve function in AVR patients with suspected stenosis.
• To determine if cine-CT can accurately identify mechanical or biological valve dysfunction.
• To assess the impact of cine-CT findings on clinical management and surgical intervention.

Main Methods:

• Retrospective review of 27 patients who underwent AVR previously.
• Patients were referred for evaluation of suspected aortic stenosis based on elevated echocardiographic gradients.
• All patients underwent comprehensive evaluation using cine-CT.

Main Results:

• Cine-CT confirmed normal leaflet function and excursion in 25 out of 27 patients.
• No cases of valve thrombosis, pannus restriction, or clot obstruction were identified by cine-CT in the majority of patients.
• Only 2 cases showed decreased mechanical valve leaflet excursion, with repeat surgery required in only 1 case.

Conclusions:

• Echocardiography is valuable but can occasionally overestimate prosthetic valve gradients.
• Cine-CT is a highly valuable tool for further evaluating suspected prosthetic aortic stenosis after AVR.
• The reassuring images from cine-CT can help avoid unnecessary reoperative interventions.