Early mechanical failures of the Hancock pericardial xenograft
نویسندگان
چکیده
منابع مشابه
Early clinical experience with the Hancock porcine xenograft valve prosthesis.
In a 2-year period, 75 Hancock porcine xenograft valves were inserted in 66 patients, 33 male and 33 female. Their average age was 55 years (range 14 to 69 years). The indication for operation was rheumatic heart disease (30 patients), prosthetic valve dysfunction (8 patients), papillary muscle dysfunction (8 patients), degenerative valve disease (13 patients), subacute bacterial endocarditis (...
متن کاملA mechanical analysis of the closed Hancock heart valve prosthesis.
In order to obtain mechanical specifications for the design of an artificial leaflet valve prosthesis, a geometrically non-linear numerical model is developed of a closed Hancock leaflet valve prosthesis. In this model, the fibre reinforcement of the leaflet and the viscoelastic properties of frame and leaflets are incorporated. The calculations are primarily restricted to 1/6 part of the valve...
متن کاملmodification of nanoclay for improving the physico-mechanical properties of dental adhesives
هدف اصلی این مطالعه تهیه یک سامانه نوین چسب عاجی دندانی بر پایه نانورس پیوند شده با پلی متاکریلیک اسید، نانورس پیوند شده با پلی اکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی متاکریلیک اسید، مخلوط نانوسیلیکا و نانورس پیوند شده با پلی اکریلیک اسید و نانورس پیوند شده با کیتوسان اصلاح شده با گلایسیدیل متاکریلات است. پیوند پلی متاکریلیک اسید و پلی اکریلیک اسید بر ری سطح نانورس در حضور و ...
Long-term haemodynamic evaluation of aortic pericardial xenograft.
Haemodynamic studies were performed in 30 patients at a mean interval of 43.4 (range 27 to 59) months after aortic valve replacements with pericardial xenografts. Five valve sizes--19, 21, 23, 25, and 27 mm annulus diameter--were used. Of these 30 patients, 16 had preoperative haemodynamic investigations. Comparison of the pre- and postoperative data showed a marginal but significant increase i...
متن کاملHemodynamic factors that affect calculated orifice areas in the mitral hancock xenograft valve.
From June 1974 to December 1978, 714 Hancock valves have been placed in 605 patients. One hundred seventy-five patients with a mitral xenograft have been restudied. The results were questionable due to the wide scatter and disparity between the calculated and the theoretical orifice of each valve size. To elucidate these differences, the hemodynamic data of 40 isolated, normal functioning mitra...
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ژورنال
عنوان ژورنال: The Journal of Thoracic and Cardiovascular Surgery
سال: 1987
ISSN: 0022-5223
DOI: 10.1016/s0022-5223(19)36282-8