Relationship between heart rate at discharge and long-term outcomes of surgically treated patients with type a acute aortic dissections

Abstract

Background: Resting heart rate (HR) at discharge is an important predictor of mortality after acute myocardial infarction. However, in patients with Stanford type A acute aortic dissections (TA-AADs), the relationship between HR and long-term outcomes is unclear. Therefore, this relationship was investigated in the present study. Methods and Results: Surgically treated consecutive patients with TA-AAD (n=721) were retrospectively categorized according to HR quartiles, recorded within 24 h before discharge (<70, 70-77, 78-83, and ≥84 beats/min). The study endpoints included aortic aneurysm-related deaths, sudden deaths, aortic surgeries, and hospitalizations for recurrence of acute aortic dissections. The mean (±SD) patient age was 65.8±13.0 years. During a median observation period of 5.8 years (interquartile range 3.9-8.5 years), 17.2% of patients (n=124) experienced late aortic events. Late aortic surgery was performed in 14.0% of patients. After adjusting for potential confounders, including β-blocker use, HR at discharge remained an independent predictor of long-term aortic outcomes. Patients with discharge HR ≥84 beats/min had a higher risk (hazard ratio 1.86; 95% confidence interval 1.06-3.25; P=0.029) of long-term aortic events than those with HR <70 beats/min; the cumulative survival rates were similar among the groups (log-rank, P=0.905). Conclusions: In surgically treated patients with TA-AAD, HR at discharge independently predicted long-term aortic outcomes. Consequently, HR in patients with TA-AAD should be optimized before discharge, particularly if the HR is ≥84 beats/min.