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Ann Thorac Surg 1997;64:1096-1098
© 1997 The Society of Thoracic Surgeons

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Original Article: Cardiovascular

In Vivo Morphology of Woven, Collagen-Sealed Dacron Prostheses in the Thoracic Aorta

Division of Thoracic and Cardiovascular Surgery, Surgical Center, and Division of Diagnostic Radiology I, Radiological Center, Hannover Medical School, Hannover, Germany

Accepted for publication April 18, 1997.

Background. Long-term changes in knitted Dacron grafts inserted into the infrarenal aorta have been addressed by a number of studies indicating their potential for postoperative dilatation. In contrast, the behavior of woven, collagen-presealed, double-velour Dacron grafts used to replace the thoracic aorta is not known.

Methods. Forty-five patients were examined at a mean of 32.4 ± 14.8 months after insertion of woven, collagen-coated, Dacron double-velour prostheses (Meadox woven with Hemashield, Meadox, Oakland, NJ) in the thoracic position under highly standardized conditions using spiral computed tomography.

Results. Compared with a manufactured diameter of 26 mm, all grafts showed an increase of 1 to 5 mm (mean, 3.0 ± 1.2 mm [11.6% ± 4.4%]; p < 0.0001) with greater enlargement of the ascending than of the descending aortic portions (p = not significant). A further statistically significant progressive dilatation failed to occur. Degenerative changes, including false aneurysm formation, could be excluded.

Conclusions. Woven, collagen-coated Dacron prostheses are considered a safe replacement material for the thoracic aorta.

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