title: Incidence and in-hospital mortality of acute aortic dissection in China: analysis of China Health Insurance Research (CHIRA) Data 2011.
abstract: OBJECTIVE
  Acute aortic dissection (AAD) is a catastrophic event with high early mortality rate, but to date, no data on the incidence of AAD in Mainland China is available. This study aimed to estimate the incidence of AAD in China and characterize the clinical profile, management and in-hospital outcomes of this vascular event.
  
  
  METHODS
  We used the China Health Insurance Research Data (the CHIRA Data) 2011 which comprises all inpatient hospital records (300,886) during the period of Jan. 1st 2011 to Dec. 31 2011 of 3,335,000 randomly sampled beneficiaries (1,718,500 men and 1,616,500 women) from 25 cities and counties in different economic-geographic regions of Mainland China. Patients with acute aortic dissection were identified according to International Classification of Disease 10(th) Revision (ICD-10) of I71.0. The estimated incidence of AAD was calculated using the equation: estimated incidence = 2.0 × (40% × hospital admission rate) + 60% × hospital admission rate.
  
  
  RESULTS
  The hospital admission rate was 2.0/100,000 (65/3,325,000, 95% CI: 1.2-2.8). The estimated annual incidence of AAD was 2.8/100,000 (95% CI: 1.9-3.6) and was higher in male than in female (3.7 vs. 1.5, P < 0.001). The mean age was 58.9 ± 13.4 years. During the mean hospital stay of 23 ± 6 days, the overall in-hospital mortality was 13.9% (9/65).
  
  
  CONCLUSIONS
  Our study showed relatively lower but not negligible incidence and in-hospital mortality of AAD in the mainland of China. The mean age of patients with AAD in Chinese was younger than that reported by researches from west countries, while the male to female incidence ratio is similar to those reported by other studies.
authors.affiliation: The Administrating Office, Chinese PLA General Hospital, Beijing, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Xia
authors.affiliation: Institute of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China.
authors.forename: Jing-Hu
authors.initials: JH
authors.lastname: Li
authors.affiliation: China Health Insurance Research Association, Beijing, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.affiliation: Brainpower Phama Consulting Co., Ltd., Beijing, China.
authors.forename: Hai-Yun
authors.initials: HY
authors.lastname: Wu
keywords: Acute aortic dissection; China health insurance research; Incidence rate