Current Indications to Surgical Repair of the Aneurysms of Ascending Aorta
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چکیده
Normal ascending aorta functions as an elastic reservoir to enhance arterial flow. It stores energy during systole and dissipates it during diastole. The medial layer of the aorta consisting of elastin, collagen, and smooth muscle cells ensures the elasticity of the aortic wall. The ascending segment of the aorta is more elastic than the descending segment, due to its greater concentration of elastic fibres. Aortic aneurysm is defined as a permanent dilation of the aortic wall that exceeds 1.5 times the normal diameter of the aorta in a specified its segment (i.e., the segment of the ascending aorta has a normal value of 24-36 mm, and its dilation for a diameter >40 mm is called aneurysm).
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