Výsledky vyhledávání - "D J Wheatley"

A generalized mathematical representation of the shape of the Wheatley heart valve and the associated static stress fields upon opening and closing

Autor: H L Oliveira, S McKee, G C Buscaglia, J A Cuminato, I W Stewart, D J Wheatley

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

This note extends previous work of the authors modelling the Wheatley valve by using six intersecting and contiguous ellipses to obtain a generalized mathematical representation of the Wheatley valve: this provides a number of free parameters that co

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Regularization of a Mathematical Model of the Wheatley Heart Valve

Autor: R. J. Rebolledo, S. McKee, J. A. Cuminato, I. W. Stewart, D. J. Wheatley

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

This note considers the mathematical model published in the Journal of Biomechanical Engineering by McKee et al. [McKee, S., Cuminato, J. A., Stewart, I. W., and Wheatley, D. J., 2021, “A Mathematical Representation of the Wheatley Heart Valve,”

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https://pubmed.ncbi.nlm.nih.gov/35864783

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5-year outcome of an interventional strategy in non-ST-elevation acute coronary syndrome: the British Heart Foundation RITA 3 randomised trial

Autor: Robert A. Henderson, Stuart J. Pocock, Rosemary Knight, Keith A.A. Fox, Philip A. Poole-Wilson, D J Wheatley, Tim Clayton, T. R. D. Shaw

Publikováno v: The Lancet. 366:914-920

Summary Background The long-term outcome of an interventional strategy in patients with non-ST-elevation acute coronary syndrome is unknown. We tested whether an interventional strategy (routine angiography followed by revascularisation) was better t

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https://doi.org/10.1016/s0140-6736(05)67222-4

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Interventional versus conservative treatment for patients with unstable angina or non-ST-elevation myocardial infarction: the British Heart Foundation RITA 3 randomised trial

Autor: Tim Clayton, T. R. D. Shaw, D J Wheatley, D. Chamberlain, Robert A. Henderson, Stuart J. Pocock, Philip A. Poole-Wilson, Keith A.A. Fox

Publikováno v: The Lancet. 360:743-751

Summary Background Current guidelines suggest that, for patients at moderate risk of death from unstable coronary-artery disease, either an interventional strategy (angiography followed by revascularisation) or a conservative strategy (ischaemia-driv

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https://doi.org/10.1016/s0140-6736(02)09894-x

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Detection of cytomegalovirus in upper gastrointestinal biopsies from heart transplant recipients: comparison of light microscopy, immunocytochemistry, in situ hybridisation, and nested PCR

Autor: M A Farquharson, S W Muir, A R McPhaden, J Murray, D J Wheatley

Publikováno v: Journal of Clinical Pathology. 51:807-811

AIM: To establish the diagnostic value of in situ hybridisation and the nested polymerase chain reaction (PCR) in detecting clinically relevant cytomegalovirus (CMV) infection in upper gastrointestinal biopsies from heart transplant patients. METHODS

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https://doi.org/10.1136/jcp.51.11.807

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Changes in the mechanical properties of bioprosthetic valve leaflets made of bovine pericardium, as a result of long-term mechanical conditioning in vitro and implantation in vivo

Autor: Peter Zioupos, John Fisher, D. J. Wheatley, J. C. Barbenel

Publikováno v: Journal of Materials Science: Materials in Medicine. 4:531-537

The long-term performance and function of bioprosthetic valves constructed from glutaraldehyde-fixed bovine pericardium depend on the leaflet material retaining its original properties. Prolonged mechanical conditioning or implantation in the human b

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https://doi.org/10.1007/bf00125589

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A dynamicin vitro method for studying bioprosthetic heart valve calcification

Autor: D. J. Wheatley, G M Bernacca, A.C. Fisher, Tom G. Mackay

Publikováno v: Journal of Materials Science: Materials in Medicine. 3:293-298

The most predictable cause of failure of a biological prosthetic heart valve is calcification. The deposition process appears to be related both to the biomaterial composition and to the presence of dynamic stresses in the leaflets. A dynamicin vitro

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https://doi.org/10.1007/bf00705296

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Strength of tissue bonds as a function of surface apposition

Autor: D. J. Wheatley, John Fenner, W. Martin, H. Moseley

Publikováno v: Lasers in Medical Science. 7:375-379

Laser assisted vascular anastomoses have potential advantages over sutured anastomoses, but the mechanism of bonding is not understood. Current theories propose that the bonding process is primarily thermal, but recent work has implicated dehydration

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https://doi.org/10.1007/bf02594075

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Shear strength of tissue bonds as a function of bonding temperature: a proposed mechanism for laser-assisted tissue welding

Autor: H. Moseley, W. Martin, D. J. Wheatley, John Fenner

Publikováno v: Lasers in Medical Science. 7:39-43

The mechanism of laser bonding is not yet understood, but it is considered to be a thermal rather than a photochemical effect. The conditions required for successful anastomosis remain a controversial topic. In an alternative approach, in vitro tissu

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https://doi.org/10.1007/bf02594047

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The effects of intraoperative hypothermia and cardiopulmonary bypass on trace metals and their protein binding ratios

Autor: Gordon S. Fell, W. D. Fraser, D. P. Taggart, D. J. Wheatley, A. Shenkin

Publikováno v: European Journal of Cardio-Thoracic Surgery. 4:587-594

The ability of intraoperative hypothermia to modify the metabolic response to cardiopulmonary bypass (CPB) was assessed by serial alterations in iron, zinc and copper, and in their molar binding ratios to their respective transport proteins, in 20 ma

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https://doi.org/10.1016/1010-7940(90)90017-t

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