The Early surgery in severe ASYmptomatic Aortic Stenosis trial- EASY-AS.

Every year, thousands of people with severe aortic stenosis—a stiffening of the heart’s main valve—feel perfectly fine, yet face a hidden risk of sudden heart failure or death. The EASY-AS trial will test whether operating on these patients immediately, rather than waiting for symptoms to appear, saves more lives and keeps them out of hospital. Current guidelines recommend “watchful waiting” for symptom-free patients, but this approach may miss a critical window for intervention. The trial will randomise 2,844 patients across UK hospitals to either early valve replacement or standard monitoring, tracking them for five years. It is designed to detect a reduction in cardiovascular death and heart failure hospitalisations from 27.7% to 21.6%, and an improvement in disability-free survival from 65% to 75%. If early surgery proves superior, the results could rewrite international treatment guidelines, shifting the default for asymptomatic patients from passive monitoring to proactive surgery. That would mean fewer emergency hospitalisations, longer independent living, and a clearer, evidence-based path for cardiologists and surgeons deciding when to intervene. A vanguard phase will first test feasibility in 200 patients before full rollout.