Aortic Dissection Clinical Trial
Official title:
The Roles of Intraluminal Pressure and the Dilation of Tunica Media in the Development of Aortic Dissection
Aortic dissection is defined as the separation of aortic medial lamellae. It is unknown why
some aortic dissection are limited in extent while other aortic dissection extend
extensively. The investigators hypothesize that the medial layers are separated as a result
of the uneven dilation and dislocation of the inner and outer layers, and if this hypothesis
is ture, dilation is necessary to the development of aortic dissection. In this study, an in
vitro experiment was performed to test whether dilation is essential to the development of
aortic dissection.
Participants will be recruited from patients with aortic repair surgery in Wuhan Asian Heart
Hospital. A piece of aortic wall will be dissected to reconstruct aorta during operation.
Firstly, the dissected aortic wall is sampled for routine pathological examination.
Secondly, the remaining tissue is cut into a 2cm by 2cm sheet, then an incision was made on
the inner surface of the tissue sheet. The outer 0.5mm media will not be incised. Thirdly,
the tissue sheet is used to seal a hole in a syringe with the incision faced inside, and
tissue sheet of the experimental group was bound by a band to restrict its dilation in the
next step. Fourthly, the syringe is filled with blue stain, and a mechanical test is
performed. Fifthly, for the experimental group, the band is removed, and the syringe is
filled with red stain. The mechanical test is performed again. Finally, the tissue sheet is
released and cut into several parts to show whether the inner and outer media layers are
separated by the blue stain or the red stain.
The mechanical test: the syringe's pressure will increase gradually to a target level, and then decrease gradually to 0 Mpa, and this process is repeated for about 60 times. ;
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