Results 201 to 210 of about 1,527 (247)

Mechanical Heart Valves in Children

Scandinavian Journal of Thoracic and Cardiovascular Surgery, 1984
Longterm follow-up of 17 children, who consecutively underwent replacement of one cardiac valve with the Björk-Shiley prosthesis, is presented. The children's mean age was 8 years (range 4-12 years) and body weight 23.5 kg (range 15.0-38.4 kg) at the time of surgery 1970-80. Nine of the 17 operations (53%) were second-stage cardiac surgery.
A, Henze, D, Lindblom, V O, Björk
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Mechanical Decalcification of the Aortic Valve

The Annals of Thoracic Surgery, 1986
Thromboembolism and anticoagulant-related complications secondary to prosthetic aortic valve replacement constitute a significant risk (28% at 5 years). From 1978 through 1984, decalcification of the aortic valve was performed in 8 patients who were undergoing coronary artery revascularization.
R M, King, J R, Pluth, E R, Giuliani, J M, Piehler   +3 more
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Stuck Mechanical Valve in Pregnancy

Journal of Cardiac Surgery, 2008
Mechanical heart valve thrombosis during pregnancy is a challenging condition. We present a pregnant patient with stuck mechanical mitral valve. During the 36th week of pregnancy, she was admitted to our emergency clinic because of aggravated dyspnea, tachypnea, and cyanosis.
Askin A, Korkmaz, Murat, Yuce, Feride, Korkmaz, Fisun, Gulcan, Mustafa, Guden   +4 more
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Impact of calcific aortic valve disease on valve mechanics

Biomechanics and Modeling in Mechanobiology, 2021
The aortic valve is a highly dynamic structure characterized by a transvalvular flow that is unsteady, pulsatile, and characterized by episodes of forward and reverse flow patterns. Calcific aortic valve disease (CAVD) resulting in compromised valve function and increased pressure overload on the ventricle potentially leading to heart failure if ...
Brennan J. Vogl, Nicholas R. Niemi, Leigh G. Griffiths, Mohamad A. Alkhouli, Hoda Hatoum   +4 more
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Mechanical Pulmonary Valve Replacement

Seminars in Thoracic and Cardiovascular Surgery: Pediatric Cardiac Surgery Annual, 2016
Although most valve operations performed annually address lesions of the aortic or mitral valves, the frequency of pulmonary valve replacement (PVR) is increasing because most patients with congenital heart disease are surviving into the adult years. The vast majority of patients, especially children that require PVR, obtain a tissue valve because of ...
John M, Stulak, Bassem N, Mora, Sameh M, Said, Hartzell V, Schaff, Joseph A, Dearani   +4 more
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Evolution of mechanical heart valves

The Annals of Thoracic Surgery, 2000
The need for prosthetic heart valves was long recognized but seemed an impossible dream before 1952 when Dr Charles Hufnagel clinically introduced a ball valve that he placed into the descending thoracic aorta for treatment of aortic valvular insufficiency.
R A, DeWall, N, Qasim, L, Carr
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Mechanical Heart Valves in Septuagenarians

Journal of Cardiac Surgery, 2008
To report on the use of a third-generation bileaflet mechanical valve in septuagenarians, selected to receive a mechanical valve, as compared to (a) a younger cohort undergoing same valve implant (study 1) and to (b) a matched group of septuagenarians undergoing biological implant (study 2).The study was carried out in a tertiary regional hospital in ...
Ascione, R, Culliford, LA, Rogers, CA, Wild, JM, Narajan, P, Angelini, G   +5 more
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Mechanism of the movements of the atrioventricular valves

The American Journal of Cardiology, 1966
Abstract Ventricular pressure, ventricular diameter, atrial pressure, the pressure gradient across the A-V valve, and intraventricular heart sounds were recorded. The mechanisms producing closing and opening of the A-V valve were analyzed. There were two producing A-V valve closure. (1) Atrial contraction normally produces presystolic closure of the A-
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Mechanisms of Expiratory Valves Resistance

American Review of Respiratory Disease, 1988
Abstract Expiratory valves are the major source of resistance in ventilator circuits. Some valves, particularly under certain conditions, cause high resistances. To establish the mechanisms of expiratory valve resistance (R), we measured R of 4 commercial valves under several experimental conditions.
R A, Kayaleh, A F, Wilson
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Mechanisms of aortic valve calcification

The American Journal of Cardiology, 2004
The calcified aortic valve lesion develops in the setting of endothelial injury and inflammation and displays hallmarks of atherosclerosis, including lipids accumulation, matrix metalloproteinase activation, and interaction with renin-angiotensin system.
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