Clinical Evaluation of the Free Margin Cusp Sizer (CALIBRATE)

Goal of the study :

The objective of this study is to study the safety and reliability of a new surgical instrument, the "Free Margin Cusp Sizer" (patented device). The measuring instrument will be used during aortic valve repair procedures to measure the length of the free edge of the aortic cusps.

State of the art :

Currently, aortic valve repair is done by visual estimation and requires a great level of experience from the surgeon. We proposed to develop an objective cusp repair technique based on the measurement of the free edge by a dedicated sizer. The measuring instrument will give the objective difference in millimeters between the normal cusp and the one with prolapse. This will then be quantitatively plicatured to correct its excess length. This new technique will allow less experienced surgeons or those in the process of learning objective guidance of valve repair. The objective measure of the free edge length may also orient the sizing of the Dacron graft used for valve sparing root replacement.

Study evaluation criteria:

• Hospital mortality (mortality at 30 days), MACCE at one year: mortality, cerebrovascular accident or transient ischemic attack, major hemorrhage, cardiac reoperation
• Echocardiographic results at discharge from hospital and at 6 months or one year

Material and methods:

• Single-center, prospective, non-randomized study
• Patient source: Patients operated for aortic valve repair or aortic valve sparing surgery at Cliniques Universitaires Saint-Luc (CUSL), Brussels
• Number of patients to be included: 120, study duration: 6,5 years, inclusion period: 5,5 years, follow-up:

1 year

• Inclusion criteria: patient with a tricuspid aortic valve operated electively for aortic valve insufficiency or dilation of the ascending aorta
• Exclusion criteria: acute aortic dissection, diffuse aortic valve calcification, endocarditis, bicuspide, unicuspid or quadricuspid aortic valve, patient under 18 and over 80

Data acquisition and patient follow-up:

The examinations carried out within the framework of this study are the same as those carried out routinely during the preoperative cardiac assessment and clinical follow-up after aortic valve repair:

• Preoperative cardiovascular examination including TTE (transthoracic ultrasound) / TEE (transesophageal ultrasound)
• Intraoperative TEE pre and post aortic valve repair
• TTE at discharge
• TTE between 6 months and one year postoperatively
• 1 month post-operative consultation (outpatient surgery)
• Consultation 1 to 2 months postoperative (referring cardiologist)
• Consultation 6-12 months postoperative (referring cardiologist) (if necessary, phone contact with the patient at 12-14 months)

Inclusion criteria

• Patients with Tricuspid Aortic Valve (TAV) operated electively for aortic valve regurgitation and or ascending aorta dilatation.

Exclusion criteria

• Acute aortic dissection;
• Diffuse aortic valve calcification;
• AV endocarditis;
• Bicuspid, unicuspid or quadricuspid aortic valves;
• Patients under the age of 18 years;
• Patients above the age of 80 years.