title: Correlation of computed tomography angiography parameters and shock index to assess the transportation risk in aortic dissection patients.
abstract: BACKGROUND
  Aortic dissection (AD) is a serious, life-threatening disease. It is currently crucial for AD patients to be transferred to a specialised hospital in a safe and timely manner. For this reason, the search for clinical and imaging changes related to transportation risk is becoming increasingly important.
  
  
  OBJECTIVE
  The transportation risks of AD patients were assessed by studying the correlation between computed tomography angiography (CTA) parameters and shock index.
  
  
  METHODS
  Thirty-six cases of AD confirmed with 64-slice volumetric CT (VCT) (18 cases of Stanford type A and 18 cases of type B) were divided into a high-risk group (14 cases, six Stanford type A and eight type B) and a low-risk group (22 cases, 12 Stanford type A and 10 type B) according to the modified Early Warning Score. The shock index (ratio of heart rate to systolic blood pressure) and measured CTA parameters were compared between the high-risk group and the low-risk group, and the correlation between the measured CTA parameters and shock index was analysed.
  
  
  RESULTS
  The shock index and ratio of false/true lumen were compared between Stanford type A and type B, and no statistically significant differences were found. The shock index and ratio of false/true lumen were compared between the high-risk group and low-risk group, revealing a statistically significant difference (p < 0.05). Moreover, a significant linear correlation was found between the ratio of false/true lumen and the shock index (r = 0.691; p = 0.001).
  
  
  CONCLUSIONS
  The higher the shock index and the ratio of false/true lumen are, the greater the transportation risk for AD patients. The shock index and the ratio of false/true lumen proved to be essential clinical and radiological indices for assessing the transportation risk of AD patients.
authors.affiliation: Department of Radiology, North China Petroleum Bureau General Hospital, Renqiu, 062552, Hebei, China, Gzj3@163.com.
authors.forename: Zhi-Jun
authors.initials: ZJ
authors.lastname: Guo
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.forename: Xue-Rong
authors.initials: XR
authors.lastname: Zi
authors.forename: Qian
authors.initials: Q
authors.lastname: Xu
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Liu
authors.forename: Jun-Ying
authors.initials: JY
authors.lastname: Lu
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Chi
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Cao
authors.forename: Bao-Hong
authors.initials: BH
authors.lastname: Zhao
authors.forename: Yu-Huan
authors.initials: YH
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000784:Aortic Dissection / Q000000981:diagnostic imaging*; D000792:Angiography; D001014:Aortic Aneurysm / Q000000981:diagnostic imaging*; D003287:Contrast Media; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007472:Iohexol; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D012769:Shock / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014187:Transportation of Patients
chemical_list: D003287:Contrast Media; D007472:Iohexol