09 июля 2002 00:00 |
Analysis of valve motion after the reimplantation
type of valve-sparing procedure (David I) with a new aortic root conduit
Background. The reimplantation
type of valve-sparing procedure does not allow proper reconstruction of the sinuses of Valsalva. We assessed the valve motion after a reimplantation type (David I) of valve-sparing procedure using a new Dacron conduit that incorporates sinuses of Valsalva.
Methods. Nine consecutive patients undergoing an aortic
valve-sparing procedure using the new conduit were studied using two-dimensional transesophageal echocardiography shortly (2 ± 1 months) after operation to determine root distensibility, expressed as percent change in radius and as pressure strain of the elastic modulus. Next, monodimensional view was used to assess valve motion in its various phases (rapid valve opening velocity, slow closing leaflet displacement, rapid valve closing velocity, maximal leaflet displacement, and leaflet displacement before valve closure). Seven healthy individuals served as control subjects.
Results. Root distensibility was reduced at the level of the annulus and sinotubular junction but was similar to control subjects at the level of the sinuses (percent change in radius, 4.1% ± 0.8% versus 4.5% ± 1.2%; pressure strain of the elastic modulus, 1,286 ± 674 g/cm2 versus 1,195 ± 628 g/cm2). Rapid valve opening (69 ± 34.4 cm/s versus 51 ± 11.9 cm/s) and closing (47.6 ± 16 cm/s versus 36.4 ± 9 cm/s) velocity as well as slow closing leaflet displacement (24% ± 4.7% versus 22.1% ± 7.9%), maximal leaflet displacement (20.1 ± 4 mm versus 22.7 ± 1.9 mm), and leaflet displacement before valve closure (15.2 ± 3 mm versus 17.6 ± 0.8 mm) were similar to control subjects.
Conclusions. The new aortic root conduit used in a reimplantation
type of valve-sparing procedure allows the anatomic reconstruction of the aortic root with leaflet motion similar to that of normal subjects.