Untreated moderate aortic stenosis at the time of isolated CABG independently predicted higher late mortality compared to patients without AS (HR 2.01; 95% CI 1.49-2.73; P<0.001).
Cohort
Effect estimate: HR 2.01 (95% CI 1.49-2.73)
Absolute Event Rate: 23% vs 38%
p-value: p=<0.001
OBJECTIVES: Aortic valve replacement (AVR) for severe aortic valve stenosis (AS) is a Class I indication at the time of coronary artery bypass grafting (CABG). Management of less-than-severe AS in patients undergoing CABG is uncertain however, because the thresholds at which untreated AS impacts long-term outcome are unclear. METHODS: We identified 312 patients who underwent isolated CABG between 1993 and 2006 with mild or moderate AS aortic valve area (AVA) 1-2 cm(2), and matched them to patients undergoing CABG alone during the same period with similar characteristics but without AS (AVA >2 cm(2)). Long-term survival after CABG and its determinants were analysed using Cox proportional hazards models with AVR as a time-dependent covariate. RESULTS: Late survival was lower in patients with untreated moderate AS (12 years 23 ± 5.1%) versus mild (42 ± 3.8%) or no AS (38 ± 3.3%) (P = 0.01). Adjusting for age, ejection fraction, heart failure, creatinine, diabetes, peripheral vascular disease (PVD) and interval AVR, moderate AS independently predicted higher mortality hazard rate (HR) 2.01, 95% confidence interval (CI) 1.49-2.73; P < 0.001; whereas incremental risk was insignificant for patients with mild AS (HR 1.09, 95% CI 0.85-1.66; P = 0.33). Further stratification showed that highest late postoperative mortality occurred with an AVA of 1-1.25 cm(2) (adjusted HR 2.45, 95% CI 1.57-3.82; P < 0.001), while risk was intermediate with an AVA of 1.25-1.5 cm(2) (HR 1.83, 95% CI 1.28-2.61; P = 0.001). CONCLUSIONS: Untreated moderate AS is an independent determinant of excess late mortality following isolated CABG, and mortality risk increases with decreasing AVA. Those with moderate-to-severe AS (AVA 1-1.25 cm(2)) have more than 2-fold greater long-term mortality compared with those without AS. These data define AS severity thresholds for clinical trials aimed at defining whether valve intervention might mitigate this risk.
Thalji et al. (Fri,) conducted a cohort in Aortic valve stenosis in patients undergoing coronary artery bypass grafting. Untreated moderate aortic stenosis vs. No aortic stenosis was evaluated on Late survival (HR 2.01, 95% CI 1.49-2.73, p=<0.001). Untreated moderate aortic stenosis at the time of isolated CABG independently predicted higher late mortality compared to patients without AS (HR 2.01; 95% CI 1.49-2.73; P<0.001).