الفهرس 
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Abstract
Valve sparing aortic root reconstruction had been popularized in the last decades over the classic root replacement (Bentall) procedure because preservation of the patient’s native aortic valve allows for better hemodynamics, left ventricular performance, lesser risk of endocarditis and avoidance of life long anticoagulation.
The native aortic valve should be preserved whenever possible because a perfect prosthetic aortic valve is yet to be developed.
There are basically two types of aortic valve-sparing operations for patients with aortic root aneurysms: reimplantation of the aortic valve (Tirone David) and remodeling of the aortic root with various modifications described later.
The objective of this study was to compare the results of David reimplantation technique versus one or two sinus replacement inrepair of aortic root aneurysm or dissection associated with aortic regurge.
50 symptomatic patients with aortic root aneurysm and dissection associated with significant aortic regurgitation were divided into two groups.
These cases were done in the period of March 2012 till July 2015 in Cairo university hospital and one case in Alexandria university hospital.
group I: 25 patients with aortic root aneurysm/dissection and significant aortic regurge undergone David reimplantation technique.
group II: 25 patients with aortic root aneurysm/dissection and significant aortic regurge undergone noncoronary sinus replacement with or without right sinus replacement.