title: Diabetes and reduced risk for thoracic aortic aneurysms and dissections: a nationwide case-control study.
abstract: BACKGROUND
  Vascular diseases are the principal causes of death and disability in people with diabetes. At the same time, studies suggest a protective role of diabetes in the development of abdominal aortic aneurysms. We sought to determine whether diabetes is associated with decreased hospitalization due to thoracic aortic aneurysms and dissections (TAAD).
  
  
  RESULTS
  We used the 2006 and 2007 Nationwide Inpatient Sample (NIS) to determine TAAD discharge rates. Control subjects were randomly selected to achieve three controls per case. Predictor variables in multilevel logistic regression included age, race, median income, diabetes, and hypertension. We estimated that the average rate of hospital discharge for TAAD among individuals diagnosed with diabetes was 9.7 per 10 000, compared to 15.6 per 10 000 among all discharges. The prevalence of diabetes was substantially lower in TAAD (13%) than in control (22%) records. After adjustment for demographic characteristics, the negative association between diabetes and TAAD remained highly significant in both NIS datasets. Compared to discharges without diabetes, those with chronic complications of diabetes were least likely to be diagnosed with TAAD (OR [odds ratio] 0.17, 95% CI, 0.12-0.23). A significant association remained between uncomplicated diabetes and TAAD. We replicated these findings in an independent group of patients who were hospitalized with acute thoracic aortic dissections.
  
  
  CONCLUSIONS
  The principal implication of our findings is that diabetes is independently associated with a decreased rate of hospitalization due to TAAD in proportion to the severity of diabetic complications. Future studies should consider diabetes in predictive models of aneurysm expansion or dissection. (J Am Heart Assoc. 2012;1:jah3-e000323 doi: 10.1161/JAHA.111.000323.).
authors.affiliation: Department of Internal Medicine, University of Texas Health Science Center at Houston,  Houston, TX (S.K.P., Y.A.K., D.M.M.).
authors.forename: Siddharth K
authors.initials: SK
authors.lastname: Prakash
authors.forename: Claudia
authors.initials: C
authors.lastname: Pedroza
authors.forename: Yameen A
authors.initials: YA
authors.lastname: Khalil
authors.forename: Dianna M
authors.initials: DM
authors.lastname: Milewicz
keywords: aneurysm; aorta; diabetes mellitus; epidemiology; risk factors