A four-dimensional study of the aortic root dynamics

Abstract

Aortic root expansion follows a precise chronology during systole and becomes more cylindrical - probably to maximize ejection. These findings might stimulate a more physiologic approach to aortic valve and aortic root surgical procedures.

Comparison of Aortic Annulus Dimension After Aortic Valve Neocuspidization With Valve Replacement and Normal Valve

“…Aortic root dynamics have been extensively studied using experimental animals [15][16][17][18][19] and MDCT in humans. [20][21][22][23][24] Dimension changes have been reported by animal studies; [17][18][19] however, results from human studies have been inconsistent.…”

“…[20][21][22][23][24] Dimension changes have been reported by animal studies; [17][18][19] however, results from human studies have been inconsistent. Although a few studies have not observed significant changes in systolic and diastolic dimensions, 20,21 a recent study reported significant changes to the aortic annulus during the cardiac cycle.…”

Evaluation of Stress Strain Patterns in a Stentless Aortic Valve and Its Leaflets

“…The leaflets are reinforced with collagen giving the structure physiological material characteristics [6][7][8][9][10]. The material properties of the valve model that were considered for the study are tabulated in Table 2 below …”

“…To understand the folding mechanism of the valve leaflets, study of the mechanical behavior of the leaflets is imperative [7]. The leaflet stresses and its deformation are given in Figure 7.…”

An Expansible Aortic Ring for a Standardized and Physiological Approach of Aortic Valve Repair

“…As soon as the valve starts closing and during diastole, the angle tilts back (as a shock absorber), reducing stress on the cusps. Therefore, the durability of native aortic valve seems to rely on a dynamic triad associating 1) systolic expansion of the aortic root, 2) a clover-shaped aortic orifice that embraces the bulging sinuses of Valsalva, and 3) tilting dynamics of the aortic valve (Lansac et al, 2002). Aortic valve surgery should try to preserve these baseline dynamics as much as possible using more physiologically based surgical approaches.…”