Early Surgery Improves Long-Term Outcomes in Asymptomatic Severe Aortic Stenosis: NEJM

A new study published in The New England Journal of Medicine revealed that among patients with very severe aortic stenosis who have no symptoms, opting for early surgical intervention significantly reduces the long-term risk of operative mortality or cardiovascular death when compared to conservative management over a 10-year period.

Aortic stenosis restricts blood flow from the heart to the rest of the body. In its most severe form, the condition can lead to heart failure and death. However, many patients remain asymptomatic for years, leaving physicians with difficulty to choose a early intervention with surgery or monitor the patient until symptoms develop.

To address this uncertainty, this randomized trial included 145 patients diagnosed with very severe aortic stenosis but no symptoms. Participants were split into a group who underwent early valve-replacement surgery, while the other received conservative care with close monitoring and only treated if symptoms emerged or their condition worsened.

Only 3% of patients in the early-surgery group experienced a combination of death during or shortly after surgery (operative mortality) or death from cardiovascular causes. In contrast, 24% of patients in the conservative-care group reached this endpoint.

After 10 years, the cumulative incidence of operative mortality or cardiovascular death was just 1% among those who had early surgery, when compared to 19% in the conservative-care group. When looking at deaths from any cause, 15% of patients in the early-surgery group had died, against 32% in the group that delayed intervention.

Overall, the findings of the study could influence future clinical guidelines and encourage cardiologists to reconsider the timing of surgery in patients with very severe aortic stenosis. While surgery always carries some risk, advances in surgical techniques and patient selection appear to have shifted the balance in favor of earlier intervention. The findings caution that treatment decisions should remain individualized. The factors such as patient age, overall health, and surgical risk must be carefully weighed.

Source:

Kang, D.-H., Park, S.-J., Kim, G. Y., Lee, S., Sun, B. J., Kim, J. B., Jung, S.-H., Kim, H.-K., Yun, S.-C., Hong, G.-R., Song, J.-M., & Chung, C.-H. (2026). Early surgery or conservative care for asymptomatic aortic stenosis at 10 years. The New England Journal of Medicine, 394(12), 1167–1174. https://doi.org/10.1056/nejmoa2511920