A systematic review of transcatheter aortic valve implantation via carotid artery access.
BACKGROUND
The carotid artery is a novel access route for transcatheter aortic valve implantation (TAVI). This may represent a viable alternative in patients unsuitable for TAVI via traditional transfemoral access, up to 20%, as well as other access routes such as subclavian, transapical and aortic. This systematic review summarises the current evidence for its safety and feasibility.


METHODS
A systematic review was conducted as per the Preferred Reporting Instructions for Systematic Reviews and Meta-analysis (PRISMA) guidelines using five electronic databases.


RESULTS
16 studies were identified, including three prospective cohort studies, one retrospective cohort study, three case series and eight case reports. Data on 74 patients (mean age 76.9years) was extracted including pre-operative work-up, technical procedure details and outcomes. This found 1 intraoperative death, 2 further deaths within 30days, two incidences of transient ischaemic attack, no incidences of stroke, myocardial infarction, carotid access site complications or infection, 1 patient required new dialysis and 1 patient had an intraoperative dissection which resolved. Follow-up from 30days to 1year showed symptomatic improvement and echocardiographic improvement in line with those seen in transfemoral TAVI.


CONCLUSIONS
The available data on TAVI via carotid access demonstrate technical feasibility with comparable outcomes to other traditional access routes. A low number of patients, heterogeneous clinical endpoints and relatively short follow-up periods limit formal meta-analysis and firmer conclusions. For patients in which other access routes are impossible, TAVI via carotid access represents a viable and potentially crucial alternative in patients who might otherwise be untreatable.
Royal Free Hospital, London, United Kingdom; University College London School of Medicine, London, United Kingdom.
Thomas
T
Stonier
Deparment of Cardiology, Hammersmith Hospital, London, United Kingdom; Imperial College School of Medicine, London, United Kingdom.
Michael
M
Harrison
Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore; School of Medicine, University of Queensland, Brisbane, Queensland, Australia; School of Medicine, Griffith University, Gold Coast, Queensland, Australia. Electronic address: andrew_choong@nuhs.edu.sg.
Andrew M T L
AM
Choong
D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000601:surgery*; D002339:Carotid Arteries / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation / Q000379:methods; D006801:Humans; D011446:Prospective Studies; D012189:Retrospective Studies; D065467:Transcatheter Aortic Valve Replacement / Q000379:methods*
Carotid; TAVI; Transcatheter aortic valve