New Treatment of Aortic Stenosis by Transcatheter Aortic Valve Research Paper

New Treatment of Aortic Stenosis by Transcatheter Aortic Valve Implantation - Research Paper Example The most common of aortic stenosis undergo in patients 65 years of age and over (called senile calcific aortic stenosis) (Kulick, 2012). General symptom of aortic stenosis patients are exertional dyspnea (shorten fatigue), angina pectoris (chest pain), syncopy (fainting), and congestive heart failure. Every aortic stenosis patient will be investigated by multidisciplinary team; 2 interventional cardiologists, 1 cardiac surgeon, and an anaesthesiologist (Bedogni et al., 2011). In general, the treatment for aortic stenosis patients, who are not showing symptoms of the disease, is to take medicine while the severely symptomatic aortic stenosis patients must have surgical aortic valve replacement. Transcatheter aortic valve implantation (TAVI) is the new procedure for severe aortic stenosis treatment. The progression of this treatment makes it suitable for patients who are inoperable or very high risk with standard surgical aortic valve replacement. In addition, the procedure of TAVI is executed in a catheterization laboratory or hybrid operating room, under general anaesthesia and without cardiopulmonary bypass (Jean-Bernard et al., 2009). The procedure of TAVI is the device implant with two transcatheter aortic valves (the Edwards SAPIEN valve, ESV or the Medtronic Corevalve, MCV) with three approaches used (transfemoral, transaxillary, or transapical) (Godino et al., 2010). The transcatheter aortic valve implantation (TAVI) was underwent with the first patient in 2002 (Rodes-Cabau, 2010). Furthermore, TAVI clearly achieved safety and efficacy of the percutaneous treatment in aortic stenosis towards the end of 2010 (success rates > 90% and 30 days procedural mortality rates < 10%) (Rodes-Cabau, 2010). The aim of this case study will be to capture the progression of transcatheter aortic valve implantation, for patients who are inoperable or with very high surgical risk in standard aortic valve replacement. Firstly, it will briefly review the cause of aortic stenos is, followed by an explanation of transcatheter aortic valve implantation procedure with two difference transcatheter aortic valves and three difference approaches. Finally, the major effective procedure of TAVI and future development of TAVI will be discussed. Impact of Aortic Stenosis Degenerative Aortic Stenosis is the most common valve disease, and its prevalence is projected to increase in the coming years due to aging populations. This has implications not only for those specializing in cardiovascular disease; Aortic Stenosis is increasingly diagnosed and treated by other medical specialties, including internal medicine, geriatrics and intensive care. This point to the increasing rang of the impacts that aortic Stenosis has been established to have. The Aorta, both ascending and descending, is responsible for the circulation of oxygenates blood throughout the body. It is no wonder that the partial or complete Stenosis of the Aorta would lead to varied conditions that can be de tected either in Intensive care Unit, when the patient is in a stupor, or by the gastric, as a result of ventral pooling of blood, caused by its stagnation in the veins, venules, and arterioles. This pooling is caused by the lack of, or limited pressure from the Aorta, to help in the circulation of

Astronomical objects Essay Example | Topics and Well Written Essays - 2750 words

Astronomical objects - Essay Example One of the most impressive achievements of science is the development of a quite detailed understanding of the physical properties of the Universe, even at its earliest stages. Astronomy and Cosmology is a fundamental part of our natural sciences today. Through close interaction with other disciplines, above all with mathematics and physics, it is been expanding, which on one hand triggers from knowledge, and then on the other profits from them. The great majority of astronomical objects are characterized by large masses and enormous energies. These generally cause matter to exist under extreme conditions of temperature and density, which, even today still lie well beyond what can be realized in a physicals laboratory. The various forms of matter that is encountered away from the Earth, at great distances is being studied as an area of interest. In current astrophysical cosmology there is some interesting and more or less generally accepted observational facts. Thus, in any active-ga lactic-nucleus phenomenon massive central objects like black holes, tachyons, neutrinos, WIMPS etc are expected to be common, and they are surrounded in a variety of scales, by gas clouds commonly termed circumnuclear gas, with liner a dimensions of a few ten kilo space. All these and few other astronomical objects and their current position in the study of cosmology is being discussed in this thesis.Neutron Stars: Neutron stars are highly compact stellar objects with masses ~ 1-2 M (where M is the mass of the sun), and radii of order 10km. ... observational data on neutron stars, gathered with a wide variety of detectors from radio to gamma-ray, provides increasingly stringent constraints on theories of their constitution. Precision radio and optical timing measurements show that pulsars have remarkable long-term timing stability, and thus the neutron stars forming them must have reasonably thick rigid crusts anchoring stable magnetic fields. Despite substantial work over the past half century, the nature of matter at the extreme densities in the cores of neutron stars remains uncertain. A better understanding of the possible states of matter in neutron stars interiors can also enable the world of cosmology to infer whether an independent family of denser quark stars, composed essentially of quark matters can exist (Rowan, 1996). Strings: Strings are extended objects with an intrinsic tension (energy per unit l length). Recent years have seen a radically different approach to the problem of quantum gravity this has led to a different idea of the possible structure of the quantum gravity theory. One of the most exciting ideas is that the fundamental entities upon which quantum operations must be performed are not point-like but are one dimensional. Such objects are usually known as strings, or more often super strings. In the last decades string theory has become a promised candidate for the underlying theory of the fundamental interactions of nature. However, even though lots of progress has been done it has not been yet possible to confront it with real physics. One possibility to achieve this is through cosmology by studying the cosmological implications of string theory. On the other hand string theory would