Results 281 to 290 of about 56,498 (290)
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Problems associated with mechanical heart valve sounds
European Journal of Cardio-Thoracic Surgery, 1992A cross-sectional study of 50 randomly selected patients 12-36 months following mechanical heart valve replacement with Bjork-Shiley tilting disc valves was undertaken to investigate the factors which affect perception of, and reaction to, sounds generated by mechanical heart valves implanted in patients. Numerous problems were generated by the valves,
D Limb, A J Murday, P H Kay
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Mechanical heart valves: 50 years of evolution
The Annals of Thoracic Surgery, 2003The past 50 years have witnessed remarkable progress in the development of safe, hemodynamically favorable mechanical heart valves. Starr-Edwards aortic and mitral ball valves introduced in the mid-1960s, continue to be used successfully worldwide. More than 100,000 Omniscience and Omnicarbon tilting-disc valves have been implanted since 1978 with ...
Duke E. Cameron +2 more
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Psychoacoustic quantification of mechanical heart valve noise.
The Journal of heart valve disease, 2005Mechanical heart valves produce short clicking sounds during closure. These closing sounds are annoying for some patients and their partners by causing sleeping disorders or social embarrassment. Various methods for measuring the sounds have been developed both in vitro and in vivo using calculation of A-weighted sound pressure level or loudness ...
Nielsen, Thomas +4 more
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Mechanical malfunction and thrombosis of prosthetic heart valves
The American Journal of Cardiology, 1972Abstract The incidence of acute valvular malfunction of prosthetic heart valves has been increasing. Mechanical failure is usually due to changes of the poppets or thrombosis of the valve. Thrombosis of the valve limits the poppet movement, thus causing dysfunction. Thrombosis has been noted in essentially all types of prosthetic valves.
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[Mechanical versus biological heart valves].
Zeitschrift fur Kardiologie, 2002Since the first successful heart valve replacement procedures were performed in the 1950s, a multitude of different heart valves have been developed and implanted. This review offers a structured overview of the most important mechanical and biological heart valves with special regard to the individual indications of mechanical versus biological heart ...
J, Ennker, A, Lauruschkat
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Mechanism of brushite formation in heart valves
Bone, 2009A.M. Titov, P.M. Larionov
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