INTERvention With Cerebral Embolic Protection in Transcatheter Aortic Valve Implantation (INTERCEPTavi)

  • days left to enroll
  • participants needed
  • sponsor
    Imperial College London
Updated on 14 December 2021
transcatheter aortic valve implantation
Accepts healthy volunteers


The study aims to evaluate the processes of a pilot single-centre randomised controlled trial (RCT) of carbon-dioxide flushing of transcatheter aortic valves (TAVI-CO2) versus standard saline flushing of valves (TAVI-S) and assess potential neuroprotection through a number of neurological endpoints for planning of a full-sized RCT


Aortic stenosis (AS) is one of the most common valve diseases and is increasing worldwide due to an ageing population. Transcatheter Aortic Valve Replacement (TAVI) is a keyhole procedure that can be done through the groin to replace the narrowed aortic valve with a new valve, avoiding the need for cardiac surgery.Improved device design and greater operator experience has improved TAVI outcomes. It has become the standard treatment option in patients who are at high risk for cardiac surgery and is now being used increasingly in lower risk patients.

Cerebrovascular accidents in TAVI patients remain a significant risk with a reported 3 - 5 % risk. Furthermore, these patients have neurovascular injury that is not clinically identifiable. Covert brain injury has been identified to occur in many surgical and cardiovascular catheter-based interventions such as TAVI and can cause vascular brain injury (VBI).

TAVI valves are manufactured in room air conditions and retain air. Studies in TEVAR (Thoracic Endovascular Aortic Repair) stent grafts have shown release of air when they are deployed in the aorta. In vitro testing of TAVI valves has shown release of air when they are deployed.

Carbon-dioxide (CO2) is 1.5 times denser than air and can displace it. It is 25 times more soluble in blood than air and does not lead to bubble formation. Hence CO2 bubble are unlikely to result in significant damage. CO2 has been used in cardiac surgery with beneficial effects. It has shown to reduce peri-procedural cerebral air embolisation and post operative cognitive dysfunction.

This study aims to look at the neuroprotective benefits of flushing TAVI valves with CO2 and saline versus saline only by reducing air embolisation.

Patients undergoing TAVI will be approached to participate in this study. After consent is obtained, patients will undergo baseline MRI, neurological and neurocognitive testing pre-TAVI. Patient will be randomised to saline only or CO2 and saline flushing of their valves. During their TAVI procedure, they will have transcranial doppler (TCD) monitoring of their middle cerebral artery (MCA) bilaterally to record cerebral embolisation. Patients will also have biomarker testing pre-TAVI, post-TAVI and 24 hours following TAVI. They will have DW-MRI brain between day 1-7 following their TAVI to look for vascular brain injury. Thus MRI will be repeated at 6-months following their TAVI. Patients will also have neurological and neurocognitive testing during their inpatient admission, at 6-weeks and 6-months outpatients.

Condition Stroke, Aortic Valve Stenosis, Silent Cerebral Infarct, Vascular Brain Injury
Treatment CO2 and saline flushing, Saline flushing
Clinical Study IdentifierNCT05146037
SponsorImperial College London
Last Modified on14 December 2021


Yes No Not Sure

Inclusion Criteria

All patients between the ages of 18 and 100 years undergoing transcatheter aortic valve implantation (TAVI) for aortic stenosis under local anaesthetic

Exclusion Criteria

Patients that lack capacity to provide informed consent
Patients that have had a stroke within 12 months
Patients aged less than 18 years of age
Patients that are pregnant
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact



Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

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.

Learn more

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

Learn more

Similar trials to consider


Browse trials for

Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note