The CASPER Registry

  • End date
    Mar 30, 2023
  • participants needed
  • sponsor
    University of Pisa
Updated on 9 June 2022


The CASPER study is a prospective, international, multicenter registry which aims to evaluate the use of an algorithm for choosing the size of the prosthesis to be implanted in patients with bicuspid aortic stenosis type I treated by TAVI with Evolut® Pro prostheses (23 -26-29) and Evolut® R 34.



This is an Investigator initiated, international, multicenter, prospective registry, enrolling 100 consecutive BAV patients who will undergo TAVI with the Evolut R/Pro (23-26-29)/Evolut R 34THV.

Enrollment will be without limitation for each center (competitive enrollment). The indication for TAVI will be based on each local Heart Team decision. As per local institution's regulatory policy, each patient will provide a written informed consent for the TAVI procedure, anonymous data collection and analysis. Each center will use its own consent template.

All data will be collected in an electronic clinical report form (eCRF).


All consecutive patients diagnosed with type 0 or type 1 bicuspid aortic valve stenosis or steno-insufficiency disease, undergoing transcatheter aortic valve implantation, as per local standard of care.

CASPER algorithm

The sizing of the THV will be performed according to the proposed algorithm.

First step ("calcium impact"): subtract 1 mm in patients with aortic calcium volume ≥300 mm3 (i.e. ≥ Class I); no subtraction in patients with aortic calcium volume <300 mm3 (i.e. Class 0).

Second step ("raphe impact"): subtract 1 mm if the raphe length is ≥50% of the perimeter derived mean annulus diameter Further 0.5 mm will be subtracted if a high burden of calcium is distributed predominantly on the raphe site.

In case of bicuspid Type 0 the second step should be skipped.

Transcatheter Aortic Valve Implantation Procedure

TAVI will be performed according to the local standards of care. Balloon valvuloplastywill be performed to prepare for TAVI deployment, at operator's discretion. Balloon size should not exceed the minimal diameter of the aortic annulus at baseline.

TAVI deployment will be performed as the current best practices. All Centers will be encouraged to implant THV according to the two cusp alignment technique. If necessary, post dilatation will be performed, based on the final hemodynamics and aortic regurgitation assessment. The postdilatation will be performed according to the calcium burden with a balloon size diameter equal to the minor annulus diameter or to the mean diameter.

Post-procedural MSCT scan

The post-procedural MSCT scan must be performed between 2 and 30 days after the index procedure.

Post implant measurements of THV dimensions (perimeter and area) will be obtained at inflow level, raphe level, and stent waist level (defined as the smallest dimension observed at any plane of the implanted prosthesis). If the raphe level corresponds to the stent waist level, only one measurement will be reported.

Eccentricity index will be calculated for each level. Eccentricity will be defined as 1-(minimal diameter/maximal diameter) and will be calculated both at the inflow and at the narrowest level.

The post-procedural raphe length (defined as the longest measurable dimension of the structure) will be measured at the same level of pre-procedural MSCT. The ratio between the pre and post-procedure raphe length will be calculated for the assessment of raphe shortening.

Strut separation data will be acquired (maximal strut distance, mean strut distance, strut eccentricity index, i.e. maximal-minimal strut separation). The stent strut spaces will be measured separately at the inflow level, with the first stent strut defined as the strut closest to the commissure between the non-coronary and right coronary sinuses. The subsequent struts will be numbered clockwise in an ascending order (1-15 for the Evolut THV).

Condition Bicuspid Aortic Valve
Treatment TAVI
Clinical Study IdentifierNCT04817735
SponsorUniversity of Pisa
Last Modified on9 June 2022


Yes No Not Sure

Inclusion Criteria

Age ≥18 years
NYHA≥2 and/or syncope and/or angina
Patient judged by the Heart Team as indicated for TAVI
Anatomical suitability for transfemoral or any alternative access TAVI, based on MSCT assessment and local expertise and preference
Estimated life expectancy>1 year

Exclusion Criteria

Age <18 years
Estimated life expectancy<1 year
Pure aortic regurgitation
No baseline MSCT evaluation
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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