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Background Acute aortic dissection (AAD) is a life-threatening medical condition with high morbidity and mortality. The association between female sex and poorer outcomes following surgery for AAD type A has been reported; however, the sex-related differences in clinical features and in-hospital outcomes of AAD type B remain to be elucidated. Methods We studied a total of 1877 patients with AAD type B who were enrolled in the Tokyo Acute Aortic Super-network from January 2013 to December 2016. Clinical features and in-hospital outcomes were compared between sexes. Independent predictors of in-hospital mortality were assessed using a multivariable analysis. Results The mean age of the patients was 69±13 years and 549 (29%) were females. Female patients were older than males (74±13 years vs 67±13 years; p&amp;lt;0.001). Females had lower systolic blood pressure on admission (158±37 mmHg vs 164±38 mmHg; p=0.007) and were more likely to have altered consciousness level at presentation (8.7% vs 3.9%; p&amp;lt;0.001), intramural hematoma (IMH)-type AAD (62.7% vs 53.6%; p&amp;lt;0.001), and DeBakey type IIIa (28.4% vs 21.8%; p=0.002) compared with males. Females were treated with medical therapy alone more frequently (90.3% vs 85.9%; p=0.009) and had a higher in-hospital mortality rate (5.3% vs 2.6%; p=0.036). A multivariable analysis revealed that age [per year, odds ratio (OR) 1.06; 95% CI 1.04–1.09; p&amp;lt;0.001], altered consciousness level (OR 3.28; 95% CI 1.54–6.98; p=0.002), shock/hypotension (OR 14.0; 95% CI 5.92–33.1; p&amp;lt;0.001), classic-type AAD (OR 2.54; 95% CI 1.36–4.73; p=0.003), and medical therapy alone (OR 0.28; 95% CI 0.15–0.54; p&amp;lt;0.001) were independent predictors of in-hospital mortality, whereas female sex was not predictive of in-hospital mortality (OR 1.64; 95% CI 0.91–2.96; p=0.10). Conclusion In AAD type B, females were older and had altered consciousness level, IMH-type, and a less widespread dissection more frequently than males. The overall in-hospital mortality was higher in females; however, female sex was not associated with in-hospital mortality after multivariable adjustment. Funding Acknowledgement Type of funding source: None

Sex-related differences in clinical features and in-hospital outcomes of acute aortic dissection type b