Associations of interfacility transfer with clinical presentation and early mortality in patients with type a acute aortic dissection: a registry study

Abstract Background Acute aortic dissection (AAD), particularly Stanford type A, is a life-threatening condition with high morbidity and mortality that requires prompt diagnosis and urgent intensive treatment including surgical repair. Our reginal aortic network has been established to develop the effective and safe transfer system for patients with AAD. Purpose This study aimed to assess how interfacility transfer impacts clinical presentation and early mortality in type A AAD patients using multicenter registry data. Methods We studied 1024 consecutive patients (age: 70 [58-79] years, 55% male) who were hospitalized for type A AAD within 24 hours after symptom onset during 2017–2018. Patients with cardiopulmonary arrest before hospital arrival were excluded. Multivariable logistic regression analysis was used to evaluate the association between interfacility transfer and operative mortality. Results In this study cohort, 539 patients were transferred from another facility, whereas the remaining 485 were directly admitted to the presenting hospital. Patients with transfer had a longer time from symptom onset to emergency surgery than those without transfer (326 [267–472] min vs. 282 [216–390] min, p<0.001). AAD-related complications (cardiac tamponade, cardiac arrest, shock, aortic rupture, end-organ malperfusion) were more frequent in patients without transfer (32.0% vs 24.5%, p=0.008). Patients with transfer underwent surgical and/or endovascular treatment more frequently (92.9% vs. 74.8%, p<0.001) and had a lower 30-day mortality rate than those without transfer (7.1% vs. 21.9%, p<0.001). The operative mortality was also lower in patients with transfer than in those without transfer (30/501 [6.0%] vs. 43/363 [11.8%], p=0.002). The multivariable analysis conducted in this study revealed that the presence of AAD-related complications at admission was associated with a higher operative mortality (odds ratio [OR]: 5.10; 95% confidence interval [CI]: 3.00–8.67, p<0.001), whereas interfacility transfer was associated with a lower operative mortality (OR: 0.54; 95% CI:0.31–0.95, p=0.031). Conclusion These findings underscore the critical role of efficient transfer systems and early intervention in managing type A AAD. Despite the delay from symptom onset to surgical intervention, interfacility transfer did not lead to adverse outcomes for patients with type A AAD.