This study is to analyse if the size of the valve can be determined with a preoperative CT scan of the heart in order to prepare the valve preoperatively to save time.

Patients with severe aortic stenosis undergo aortic valve replacement (AVR). One approach to reduce trauma and operation time is the implantation of a sutureless valve to reduce aortic cross-clamp time due to the missing necessity of suturing the valve. Until now, sizing of the valve was determined intraoperatively using the measuring devices provided by the product manufacturer. Due to the implantation mechanism, the valve has to be collapsed after determination of the size. This is consuming time and can seriously delay the procedure.

This study is to analyse if the size of the valve can be determined with a preoperative CT scan of the heart in order to prepare the valve preoperatively to save time.

Inclusion Criteria:

• Implantation of a Sorin Perceval ® sutureless valve
• availability of preoperative CT scan

Exclusion Criteria:

• denial of consent
• missing preoperative CT scan
• bad quality of preoperative CT scan

patients with implantation of a Sorin Perceval ® sutureless valve at University Hospital Basel/ Switzerland