Remodeling versus reimplantation in aortic root surgery – comparative results and risk factors for aortic insufficiency

Abstract

Highlights. The main approaches to the aortic root valve-sparing surgery of are reimplantation and remodeling;The literature review demonstrates either the relative identity of the reimplantation and remodeling clinical outcomes, or the advantage of reimplantation in relation to long-term results.Abstract. In recent decades, valve-sparring methods of aortic root replacement, including reimplantation and remodeling, as well as their modifications, have been developed and put into widespread practice. The effectiveness and durability of these two approaches is the subject of discussions in the modern cardiac surgery community. The global experience in performing remodeling and reimplantation procedures allows  for a comprehensive literature review to compare the results of these approaches.  The presented review is devoted to the comparison of surgical aspects and clinical outcomes of reimplantation and remodeling techniques, the analysis of the feasibility of restoring the physiological architectonics of the aortic root in valve-sparring operations using Valsalva grafts, as well as the assessment of risk factors for residual aortic insufficiency after such interventions. The search strategy included the analysis of international (PubMed, Scopus, Embase) databases for the following keywords: “reimplantation versus remodeling for aortic root valve-sparring procedures”, “David procedure versus Yacoub procedure”, “Valsalva graft for aortic root valve-sparring procedures”, “Valve-sparing aortic root repair with an anatomically shaped sinus prosthesis”. Literature analysis demonstrates either the relative identity of early and long-term results of reimplantation and remodeling procedures, or the advantage of reimplantation in terms of freedom from late mortality and residual aortic insufficiency. Preservation of the physiology of the aortic root by implantation of Valsalva grafts or remodeling provides better hemodynamics and reduces stress on the leaflets, however, these postulates run counter to the data of clinical studies analyzing postoperative outcomes and demonstrating the lack of advantages of Valsalva grafts over linear prostheses in terms of freedom from aortic valve surgery. Residual postoperative regurgitation of a mild degree, a decrease in the effective height below 9 mm and additional interventions on the leaflets are reliable factors of significant aortic insufficiency in the long-term period after valve-sparring operations on the aortic root.