CONGRESS ABSTRACT

Aortic stenosis (AS) is the most prevalent valvular heart disease in developed countries, associated with reduced survival if severe AS remains untreated. Recent reports note unfavorable outcomes in moderate AS (mAS) patients, challenging optimal intervention timing. Variations in pathophysiology linked to sex differences, involving sex hormones, activation of the renin-angiotensin-aldosterone system, and dysregulation in collagen synthesis, have been observed. Yet, limited data exists on sex-specific differences in mAS outcomes. This single-center, retrospective study included 150 patients (median age 79±13 years, female sex 48%) diagnosed with mAS who underwent comprehensive echocardiography in IRCCS Fondazione Ca’ Granda Ospedale Maggiore Policlinico of Milan from July 2022 to October 2023. Clinical data, encompassing demographics details and therapy, were obtained via record reviews and phone interviews. Death verification relied on the ‘Sistema Informativo Socio-Sanitario Regione Lombardia’ database. Echocardiographic records were digitally stored and post-processed by four independent investigators using Medimatic ComPACS workstation. Men were significantly younger than women (75±10 vs 79±9.7 years, p= 0.016). They exhibited lower left ventricular (LV) ejection fraction, larger LV end-systolic volume and stroke volume compared to women (54±7 vs 59±10%; p=0.028. 55±36 vs 31±13 ml; 0.001. 83±18 vs 75±18 ml; p=0.030). Men had significantly smaller aortic valve (AV) area index to body surface area (BSA) (0.6±0.09 vs 0.7±0.1 cmq/mq; 0.001) and lower doppler velocity index (0.32±0.07 vs 0.38±0.11; 0.001) than women. Coronary artery disease and smoking were more frequent in men (53.3 vs 46.7%; p=0,002. 52.6 vs 47.4%; 0.001). In survival analysis, 15% of women and 30.8% of men experienced events, with male gender independently associated with the composite outcome (all-cause mortality and AV replacement) over a mean follow-up time of 200 ± 133 days, showing a median survival of 244±16 vs 255±15 days for females (p-value=0.025). In multivariable analysis including relevant clinical variables (hemoglobin and AV index to BSA), male sex remained independently associated with the composite outcome (hazard ratio 2,01; CI 1.0-4.17; p=0.05). Women diagnosed with mAS exhibited a lower incidence of AV replacement and all-cause mortality. These findings may suggest the existence of different clinical and echocardiographic phenotypes among patients with AS.