Structure of bovine parietal pericardium and of unimplanted Ionescu-Shiley pericardial valvular bioprostheses
نویسندگان
چکیده
منابع مشابه
Non-invasive assessment by Doppler ultrasound of 155 patients with bioprosthetic valves: a comparison of the Wessex porcine, low profile Ionescu-Shiley, and Hancock pericardial bioprostheses.
One hundred and fifty five patients with 167 bioprosthetic valves (68 Wessex porcine, 54 Hancock pericardial, and 45 low profile Ionescu-Shiley pericardial valves) were studied by Doppler ultrasound. Valve gradients were calculated from the mitral and aortic flow velocities by the modified Bernoulli equation. Mean mitral gradients were significantly smaller across the Ionescu-Shiley valves than...
متن کاملComparison between the decellularized bovine pericardium and the conventional bovine pericardium used in the manufacture of cardiac bioprostheses
Introduction: In this paper, our objective was to compare the decellularized and conventional pericardium mechanical resistance and also its capability of inducing inflammatory response in an animal experimental model. Methods: In order to study these properties, we divided the pericardia into two groups: Group I pericardium conventionally treated with GTA and Group II – pericardium previously ...
متن کاملthe underlying structure of language proficiency and the proficiency level
هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...
15 صفحه اولPrimary leaflet tear without dystrophic calcifications in a 25 years old Ionescu-Shiley pericardial valve in mitral position
Despite its excellent hemodynamic performance, the Ionescu-Shiley bovine pericardial bioprosthesis was removed from clinical use in 1987 because of an unacceptable high incidence of primary structural deterioration of the valve, mainly related to its design. Few examples of very long-term durability of this prosthesis have been recently reported. In all these cases, the valve dysfunction was ca...
متن کاملPericardial Parietal Mesothelial Cells: Source of the Angiotensin-Converting-Enzyme of the Bovine Pericardial Fluid
BACKGROUND Angiotensin II (Ang II), the primary effector hormone of the renin-angiotensin system (RAS), acts systemically or locally, being produced by the action of angiotensin-converting-enzyme (ACE) on angiotensin I. Although several tissue RASs, such as cardiac RAS, have been described, little is known about the presence of an RAS in the pericardial fluid and its possible sources. Locally p...
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ژورنال
عنوان ژورنال: The Journal of Thoracic and Cardiovascular Surgery
سال: 1981
ISSN: 0022-5223
DOI: 10.1016/s0022-5223(19)39457-7