Variations in the branching pattern and dimensions of arch of aorta

Isai Vani, N (2009) Variations in the branching pattern and dimensions of arch of aorta. Masters thesis, Thanjavur Medical College, Thanjavur.


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Aortic arch is a dynamic structure showing a wide variation in its branching pattern which are often associated with anomalies of cerebral vasculature and other cardiovascular anomalies. The presence of anomalous branches decides the surgical approach, increases the failure rate and neurological complication in stenting procedures. The diameters of the aortic arch decreases as it gives off its branches which is important in designing tapered modifications of stents in endovascular repair of aortic dissection. Even though variations in branching pattern and anomalies are documented in the literature, very few data are available regarding the dimensions of normal and anomalous arch and its branches. Therefore we intend to study the variations in branching pattern of arch of aorta and dimensions of the arch and its branches in cadaveric specimens by gross dissection. Specimens from hundred adult human cadavers aged above 20 years of both sex were obtained from the Departments of Anatomy and Forensic medicine, Thanjavur Medical College, Thanjavur. They were fixed and dissected to observe the branching pattern of aortic arch, which was confirmed by examining the ostium on the luminal side or by making silicon luminal casts of the aortic arch. The diameters of the aortic arch and its branches were also measured at different points. The frequency of the various branching patterns observed are Type I – 79%, Type II – 14%, Type III – 4%, Type IV – 2% and Type IX – 1%. The diameter of the aortic arch was found to decrease significantly (p < 0.05) from its proximal to distal end in both normal and variant branching patterns. The mean taper ratio is 22.57 ± 0.67% and the taper ratio did not differ significantly between the normal and variant groups. The diameter of aortic arch at different points differ significantly (p < 0.001) from the values measured by Wright NL and Hager. While Hager studied live patients which could account for the difference, the difference in cadaveric specimens used by Wright could be due to racial differences between Irish and Indian populations. Further studies on the dimensions of the aortic arch and its branches in live individuals will enable us in designing stents.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Variations, branching pattern, dimensions, arch of aorta.
Subjects: MEDICAL > Anatomy
Depositing User: Subramani R
Date Deposited: 05 Oct 2019 12:28
Last Modified: 05 Oct 2019 12:28

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