CT Angiography Clinical Trial
Official title:
Anatomical Study of Aorta Balloon Occlusion Based on CT Angiography:A Retrospective Study
Aortic balloon occlusion can be used by emergency physicians to rescue patients with massive bleeding.The purpose of this study is to study the anatomical characteristics of aortic balloon occlusion based on aortic CT angiography, so as to provide evidence for improving the success rate of aortic balloon occlusion guided by body surface markers.
Study Design:
This study is a retrospective descriptive study. The study will be conducted by Radiology
Department, Second Affiliated Hospital, Zhejiang University.
Selection of patients:
The investigators included 57 patients who underwent enhanced contrast full-length aortic CTA
scanning in the Radiology Department of Grade 3A General Hospital affiliated to a university
from April to December 2019. Data of all participants following no apparent vascular
tortuosity in CT diagnosis aged 18-70 years with contrast-enhanced computed tomography (CT)
images of chest, abdomen, and pelvis from April to December in 2019 were analyzed.
Participants whose images accompanied by vascular malformation, poor contrast enhancement,
and history of aortic surgery were precluded.
Method General data of patients were collected through the hospital's electronic medical
record system, including age, sex, height, weight, average body mass index ((Body Mass
Index,BMI), history of surgery, etc.
The CTA examination of the participants' full aorta was performed with a 128-slice
dual-energy CT scanner (Siemens, Germany), and the images were saved in the database. After
screening the suitable participants, the images were transmitted to the CT workstation (Syngo
VB10B Image processing system, Siemens, Germany). Multiplanar reconstruction, curvature plane
reconstruction, and volume rendering were used for three-dimensional reconstruction. The
diameters and lengths of blood vessels and the distances on the body surface were measured.
The diameters of blood vessels included the diameter of the aorta at the edge of left
subclavian artery, celiac trunk, lowest renal artery, and aortic bifurcation. The
intravascular length included the lengths of zone I, zone II, zone III and the descending
aorta. The length from the bilateral femoral artery puncture site to the midpoint of zone I
and III, left subclavian artery, celiac trunk, lowest renal artery and aortic bifurcation,
and the distances on the body surface included the distance from the bilateral femoral artery
puncture site to the suprasternal notch, xiphoid process and umbilicus.
The results were described as mean ±standard deviation. SPSS20.0 software (IBM, USA) was used
for analysis. Paired sample t-test was used to compare the differences between the left and
right sides of the data. The difference was statistically significant when the P value was
less than 0.05.
Data Management and Confidentiality Data Management: Using paper version for data management
and storage. The person responsible for collecting paper version will input data in Excel
database, summary paper and electronic versions for further statistical analysis and
preservation.
Security measures: All records related to the identity of participants are to be confidential
and not open to the public outside the scope of relevant laws or regulations.
Informed consent: This study is a retrospective study. Retrospective measurement of
participants' previous aortic CTA imaging data does not infringe upon the interests of
participants, so informed consent can be exempted.
Possible risks of participating in this study: disclosure of personal information.
Precautions against possible risks:
1. All the experimental data of the paper version and the electronic version shall be kept
by the person in charge of the test data.
2. Close the measurement software in time after the end of the study, and confirm that the
personal information has been cleared.
Intervention measures for possible risks:
If there is a disclosure of personal information, it is necessary to record the research
report form and inform the person in charge of the research to intervene in time, and notify
the Ethics Committee immediately.
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