Air bubbles are released by thoracic endograft deployment: An in vitro experimental study
Journal article, 2016

Purpose: Embolic stroke is a dreaded complication of thoracic endovascular aortic repair. The prevailing theory about its cause is that particulate debris from atherosclerotic lesions in the aortic wall are dislodged by endovascular instruments and embolize to the brain. An alternative source of embolism might be air trapped in the endograft delivery system. The aim of this experimental study was to determine whether air is released during deployment of a thoracic endograft. Methods: In an experimental benchtop study, eight thoracic endografts (five Medtronic Valiant Thoracic and three Gore TAG) were deployed in a water-filled transparent container drained from air. Endografts were prepared and deployed according to their instructions for use. Deployment was filmed and the volume of air released was collected and measured in a calibrated syringe. Results: Air was released from all the endografts examined. Air volumes ranged from 0.1 to 0.3 mL for Medtronic Valiant Thoracic and from <0.025 to 0.04 mL for Gore TAG. The largest bubbles had a diameter of approximately 3 mm and came from the proximal end of the Medtronic Valiant device. Conclusion: Air bubbles are released from thoracic endografts during deployment. Air embolism may be an alternative cause of stroke during thoracic endovascular aortic repair.



thoracic endovascular aortic repair




Kamuran Inci

University of Gothenburg

Giasemi Koutouzi

Valery Chernoray

Chalmers, Applied Mechanics, Fluid Dynamics

Anders Jeppsson

University of Gothenburg

Håkan Nilsson

Chalmers, Applied Mechanics, Fluid Dynamics

Mårten Falkenberg

University of Gothenburg

SAGE Open Medicine

2050-3121 (ISSN)

Vol. 4 1-5

Subject Categories


Other Medical and Health Sciences

Cardiac and Cardiovascular Systems

Fluid Mechanics and Acoustics


Basic sciences

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