Cost-effectiveness of TAVI in the United Kingdom: a long-term analysis based on 4-year data from the Evolut Low Risk Trial

Background: The cost-effectiveness of transcatheter aortic valve implantation (TAVI) vs. surgical aortic valve replacement (SAVR) has previously been reported across the spectrum of surgical mortality risk. We present an updated analysis specific to the UK based on 4-year data from the Evolut Low Risk Trial, which showed a maintained numerical survival benefit with TAVI. Methods: A decision-analytic Markov model was used to project outcomes and costs over a lifetime horizon. Adverse events and utilities were modeled based on 4-year trial data. Beyond 4 years, no difference in long-term survival between TAVR and SAVR was assumed. Costs were informed by NHS England reference costs and reflect resource utilization in the UK TAVI Trial, with costs and effects discounted at 3.5% p.a. The lifetime incremental cost-effectiveness ratio (ICER) was evaluated against the established £20,000-£ 30,000 per QALY cost-effectiveness threshold. Extensive sensitivity and scenario analyses were performed, including comparison to prior results based on 12-month data. Results: TAVI improved survival by 0.41 life years and added 0.28 QALYs at incremental cost of £5,021, resulting in a lifetime ICER of £17,883 per QALY gained. 57.5% and 85.3% of probabilistic sensitivity analysis simulations were cost-effective at the £20,000 and £30,000 per QALY thresholds. Use of 4- vs. 1-year trial data markedly improved lifetime cost-effectiveness. Conclusion: Recent 4-year follow-up data from the Evolut Low Risk trial suggest TAVI adds meaningful patient benefit over lifetime and can be expected to be a cost-effective intervention compared to SAVR for low surgical risk patients in a UK setting.