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Ann Thorac Surg 2001;72:487-494
© 2001 The Society of Thoracic Surgeons

Original article: cardiovascular

Opening and closing characteristics of the aortic valve after valve-sparing procedures using a new aortic root conduit

Ruggero De Paulis, MDa, Giovanni Maria De Matteis, MDa, Paolo Nardi, MDa, Raffaele Scaffa, MDa, Maria Michaela Buratta, MDa, Luigi Chiariello, MDa

a Department of Cardiac Surgery, University of Rome, "Tor Vergata", Rome, Italy

Address reprint requests to Dr De Paulis, Cattedra di Cardiochirurgia, Università di Roma Tor Vergata, European Hospital, via Portuense 700, 00149 Rome, Italy
e-mail: depauli{at}tin.it

Presented at the Thirty-seventh Annual Meeting of The Society of Thoracic Surgeons, New Orleans, LA, Jan 29–31, 2001.

Background. The durability of aortic valve-sparing procedures is negatively affected by increased leaflet stress in the absence of normally shaped sinuses of Valsalva. We compared valve motion after remodeling procedures using a standard conduit and a specifically designed aortic root conduit.

Methods. Echocardiographic studies of the aortic valve dynamics were performed in 14 patients after remodeling of the aortic root (7 standard conduits, group A; 7 new conduits, group B) and in 7 controls (group C). Opening and closing leaflet velocities and percent of slow closing leaflet displacement were measured. Root distensibility and the pressure strain of the elastic modulus were measured at all root levels.

Results. Root distensibility and the pressure strain of the elastic modulus were different in group A and B only at the sinuses (p < 0.001). Opening and closing leaflet velocities were not different among groups. Slow closing leaflet displacement was markedly more evident in group B patients (24.2% ± 1.9% versus 2.5% ± 1.9% in group A, p < 0.001) and similar to controls (22.1% ± 7.9%).

Conclusions. The new conduit guarantees dynamic features of the aortic valve leaflets superior to those obtained with standard conduits and more similar to normal subjects.




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