• UK TAVI Trial Investigators, William D Toff, David Hildick-Smith, Jan Kovac, Michael J Mullen, Olaf Wendler, Anita Mansouri, Ines Rombach, Keith R Abrams, Simon P Conroy, Marcus D Flather, Alastair M Gray, Philip MacCarthy, Mark J Monaghan, Bernard Prendergast, Simon Ray, Christopher P Young, David C Crossman, ClelandJohn G FJGFRobertson Centre for Biostatistics and Glasgow Clinical Trials Unit, Institute of Health and Wellbeing, University of Glasgow, Glasgow, Scotland., Mark A de Belder, Peter F Ludman, Stephen Jones, Cameron G Densem, Steven Tsui, Manoj Kuduvalli, Joseph D Mills, Adrian P Banning, Rana Sayeed, Ragheb Hasan, Douglas G W Fraser, Uday Trivedi, Simon W Davies, Alison Duncan, Nick Curzen, Sunil K Ohri, Christopher J Malkin, Pankaj Kaul, Douglas F Muir, W Andrew Owens, Neal G Uren, Renzo Pessotto, Simon Kennon, Wael I Awad, Saib S Khogali, Maciej Matuszewski, Richard J Edwards, Bandigowdanapalya C Ramesh, Miles Dalby, Shahzad G Raja, Giovanni Mariscalco, Clinton Lloyd, Ian D Cox, Simon R Redwood, Mark G Gunning, and Paul D Ridley.
• Department of Cardiovascular Sciences, University of Leicester, Leicester, England.
• JAMA. 2022 May 17; 327 (19): 187518871875-1887.

ImportanceTranscatheter aortic valve implantation (TAVI) is a less invasive alternative to surgical aortic valve replacement and is the treatment of choice for patients at high operative risk. The role of TAVI in patients at lower risk is unclear.ObjectiveTo determine whether TAVI is noninferior to surgery in patients at moderately increased operative risk.Design, Setting, And ParticipantsIn this randomized clinical trial conducted at 34 UK centers, 913 patients aged 70 years or older with severe, symptomatic aortic stenosis and moderately increased operative risk due to age or comorbidity were enrolled between April 2014 and April 2018 and followed up through April 2019.InterventionsTAVI using any valve with a CE mark (indicating conformity of the valve with all legal and safety requirements for sale throughout the European Economic Area) and any access route (n = 458) or surgical aortic valve replacement (surgery; n = 455).Main Outcomes And MeasuresThe primary outcome was all-cause mortality at 1 year. The primary hypothesis was that TAVI was noninferior to surgery, with a noninferiority margin of 5% for the upper limit of the 1-sided 97.5% CI for the absolute between-group difference in mortality. There were 36 secondary outcomes (30 reported herein), including duration of hospital stay, major bleeding events, vascular complications, conduction disturbance requiring pacemaker implantation, and aortic regurgitation.ResultsAmong 913 patients randomized (median age, 81 years [IQR, 78 to 84 years]; 424 [46%] were female; median Society of Thoracic Surgeons mortality risk score, 2.6% [IQR, 2.0% to 3.4%]), 912 (99.9%) completed follow-up and were included in the noninferiority analysis. At 1 year, there were 21 deaths (4.6%) in the TAVI group and 30 deaths (6.6%) in the surgery group, with an adjusted absolute risk difference of -2.0% (1-sided 97.5% CI, -∞ to 1.2%; P < .001 for noninferiority). Of 30 prespecified secondary outcomes reported herein, 24 showed no significant difference at 1 year. TAVI was associated with significantly shorter postprocedural hospitalization (median of 3 days [IQR, 2 to 5 days] vs 8 days [IQR, 6 to 13 days] in the surgery group). At 1 year, there were significantly fewer major bleeding events after TAVI compared with surgery (7.2% vs 20.2%, respectively; adjusted hazard ratio [HR], 0.33 [95% CI, 0.24 to 0.45]) but significantly more vascular complications (10.3% vs 2.4%; adjusted HR, 4.42 [95% CI, 2.54 to 7.71]), conduction disturbances requiring pacemaker implantation (14.2% vs 7.3%; adjusted HR, 2.05 [95% CI, 1.43 to 2.94]), and mild (38.3% vs 11.7%) or moderate (2.3% vs 0.6%) aortic regurgitation (adjusted odds ratio for mild, moderate, or severe [no instance of severe reported] aortic regurgitation combined vs none, 4.89 [95% CI, 3.08 to 7.75]).Conclusions And RelevanceAmong patients aged 70 years or older with severe, symptomatic aortic stenosis and moderately increased operative risk, TAVI was noninferior to surgery with respect to all-cause mortality at 1 year.Trial Registrationisrctn.com Identifier: ISRCTN57819173.

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