Age-Related Differences in the Effects of Initial Aortic Valve Replacement vs. Conservative Strategy on Long-Term Outcomes in Asymptomatic Patients With Severe Aortic Stenosis

摘要

Background: This study aimed to evaluate the effect of the initial aortic valve replacement (AVR) strategy relative to a conservative strategy on long-term outcomes stratified by age among asymptomatic patients with severe aortic stenosis (AS). Methods?and?Results: Among 1,808 asymptomatic severe AS patients in the CURRENT AS registry, there were 1,166 patients aged ≥75 years (initial AVR: n=124, and conservative: n=1,042), and 642 patients with age 75 years (initial AVR: n=167, and conservative: n=475). Median follow-up interval was 1,280 (interquartile range [IQR]: 1,012–1,611) days, and 1461 (IQR: 1,132–1,886) days in patients aged ≥ and 75 years, respectively. The favorable effect of the initial AVR strategy relative to conservative strategy for heart failure (HF) hospitalization was seen regardless of the age stratum (≥75 years: adjusted hazard ratio [HR] 0.13, 95% confidence interval [CI] 0.05–0.34, and 75 years: HR 0.37, 95% CI 0.14–0.99, interaction P=0.35). However, the lower mortality risk of the initial AVR strategy relative to conservative strategy was significant in patients aged ≥75 years, but not in patients 75 years, with significant interaction (HR 0.35, 95% CI 0.20–0.61, and HR 0.69, 95% CI 0.41–1.16, interaction P=0.016). Conclusions: The benefit of initial AVR in reducing HF hospitalization in asymptomatic patients with severe AS was consistently seen regardless of age. The magnitude of mortality benefit of initial AVR was greater in super-elder patients than in non-super-elder patients.