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Search Results: 1 - 10 of 20166 matches for " Alexander Mazur "
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Bundle Branch Reentrant Ventricular Tachycardia
Alexander Mazur,Jairo Kusniec,Boris Strasberg
Indian Pacing and Electrophysiology Journal , 2005,
Abstract: Bundle branch reentrant (BBR) tachycardia is an uncommon form of ventricular tachycardia (VT) incorporating both bundle branches into the reentry circuit. The arrhythmia is usually seen in patients with an acquired heart disease and significant conduction system impairment, although patients with structurally normal heart have been described. Surface ECG in sinus rhythm (SR) characteristically shows intraventricular conduction defects. Patients typically present with presyncope, syncope or sudden death because of VT with fast rates frequently above 200 beats per minute. The QRS morphology during VT is a typical bundle branch block pattern, usually left bundle branch block, and may be identical to that in SR. Prolonged His-ventricular (H-V) interval in SR is found in the majority of patients with BBR VT, although some patients may have the H-V interval within normal limits. The diagnosis of BBR VT is based on electrophysiological findings and pacing maneuvers that prove participation of the His- Purkinje system in the tachycardia mechanism. Radiofrequency catheter ablation of a bundle branch can cure BBR VT and is currently regarded as the first line therapy. The technique of choice is ablation of the right bundle. The reported incidence of clinically significant conduction system impairment requiring implantation of a permanent pacemaker varies from 0% to 30%. Long-term outcome depends on the underlying cardiac disease. Patients with poor systolic left ventricular function are at risk of sudden death or death from progressive heart failure despite successful BBR VT ablation and should be considered for an implantable cardiovertor-defibrillator.
Social Pressure on Patient Decision Making through Shifting Mental Models: Presenting Evidence to Patients  [PDF]
Dennis J. Mazur
Sociology Mind (SM) , 2015, DOI: 10.4236/sm.2015.52010
Abstract: In humans, the processes of thinking or making decisions are usually based on mental models. Some of these mental models are designed to represent how humans think and decide, while others aim to improve their thinking and decision making. In decision making related to a patient’s health and medical care, high courts aim to protect the patient’s right to be involved in this process, while societal forces attempt to control costs associated with health and medical decision making. This paper examines legal, decision making, and social theories regarding the societal forces that attempt to influence the grounds upon which a patient thinks and decides about his or her health and medical care.
Why were "starvation diets" promoted for diabetes in the pre-insulin period?
Allan Mazur
Nutrition Journal , 2011, DOI: 10.1186/1475-2891-10-23
Abstract: During the first third of the 20th century, Frederick M. Allen and Elliott P. Joslin were among the most prominent diabetes specialists in America. Joslin, the elder man, encouraged Allen's early experimental studies, and the two physicians rapidly converged on the belief that severely calorie-restricted diets were the best therapy for diabetes. For a brief period, from 1915 until the introduction of insulin in 1922, they promoted what have been pejoratively called "starvation diets" - diets based on repeated fasting and prolonged undernourishment -- as the most advanced treatment for diabetes mellitus, not as a cure, but for relief of symptoms and maximum extension of life.There is no doubt that fasting usually reduces glucose levels in diabetics, but prolonged calorie-restricted diets introduced new hazards, most obviously death by starvation, which Allen and Joslin euphemistically called "inanition." It is accepted today that calorie restriction is beneficial for diabetics who are overweight. But for those of normal or lower weight, it was already understood in Allen's time that severe calorie restriction could lessen resistance to infection, and for children it might stunt growth. Fasting and undernourishment therapy was a balancing act, overseen by a specialist while the patient remained under close supervision in a hospital or clinic, and prone to backsliding by patients who returned home. The permanently calorie-restricted diet was unpleasant, difficult to maintain, and enervating, with the result that many patients withdrew from the regimen. Observers wondered if such privation was too high a price for a modest extension of poor quality life. Joslin commented retrospectively, "We literally starved the child and adult with the faint hope that something new in treatment would appear...It was no fun to starve a child to let him live" [1].Allen's most famous patient was Elizabeth Hughes, the daughter of Charles Evans Hughes, Governor of New York, Republican cand
Structure and dynamics of silver fir (Abies alba Mill.) population in forest communities of the wi tokrzyski National Park. I. The population structure
Maria Mazur
Acta Societatis Botanicorum Poloniae , 1989, DOI: 10.5586/asbp.1989.033
Abstract: The paper presents the spatial, age and size structures of individuals in silver fir population. The studies were conducted in fir forest and Carpathian beechwood. It was found that fir trees were distributed randomly, whereas seedlings, new growth and up-growth had clumped distribution. The growth and development of individuals in aggregations and outside them were analysed. The stress was put on the impact of spatial structure on the process of population regeneration. Age pyramid was flat with its base very wide. About 40% of trees in the population were dead.
Structure and dynamics of silver fir (Abies alba Mill.) population in forest communities of the wi tokrzyski National Park. II. Population dynamics
Maria Mazur
Acta Societatis Botanicorum Poloniae , 1989, DOI: 10.5586/asbp.1989.034
Abstract: The paper presents the dynamics of silver fir population, and forecasts the changes in its size. The studies were conducted within the area of fir decline, in a fir forest and Carpathian beechwood. Changes in the size of following groups were illustrated in diagrammatic life-tables: i.e. seedlings, new growth, up-growth, and trees. The direction and rate of expected changes in the population was inferred from the matrix model. The studies showed that the population was in a regression phase. Population growth rate λ amounted to 0.83.
Identity in the conditions of globalisation and regionalisation
Mazur Yu.
Vestnik Immanuel Kant Baltic Federal University , 2013,
Abstract: This article considers the influence of globalisation processes on the development of the crisis of historical and ethnocultural identity and describes the factors affecting the ethnocultural identity transformation. The author analyses how globalisation results in both the blurring of ethnocultural identity and the intensification of regionalisation processes.
Time and the laws of Nature
A. Mazur
Physics , 2000,
Abstract: What is time? Why does it "flow" and why are we sure that it flows from past towards future? Why is there such a gigantic distinction between the Past of our world, which we believe to be fixed, and the Future, which we consider undetermined? And this is in spite of the fact that almost all physical laws are time-symmetric! Why does previously undetermined "Future" acquire its steadiness as it passes the moment called "the Present"? Perhaps, these questions are partially answered in the considerations below.
Nonperturbative Quantum Field Theory in Astrophysics
Dan Mazur
Physics , 2012,
Abstract: The extreme electromagnetic or gravitational fields associated with some astrophysical objects can give rise to macroscopic effects arising from the physics of the quantum vacuum. Therefore, these objects are incredible laboratories for exploring the physics of quantum field theories. In this dissertation, we explore this idea in three astrophysical scenarios.
Crystal excitations features in the photon emission spectrum of the quantum channeled particle
Evgeny Mazur
Physics , 2015, DOI: 10.1016/j.nimb.2015.02.013
Abstract: The processes of generation of phonons and electron excitations with quantum oriented particle in crystal are considered. Expressions are obtained for the probability of emission of phonons and plasmons with channeled particle. The theory of the processes of the crystal excitation with the channeled particle, accompanied by the simultaneous emission of a photon is developed. It is proved that all the specific features of the electron and phonon crystal excitation structure appear as components of radiation of the oriented fast charged particle. The photon emission of a quantum channeled particle, accompanied by a plasmon excitation in a crystal target is considered. It is taken into account that the plasmon energy in the crystal is of the same order with the depth of the potential well in which the channeled particle moves. A weak dispersion of the plasmons in the crystal is taken into account, which leads to the selection of the fixed plasmon energy. It is shown that fast charged particle in the rest frame emits photons with an energy equal to the energy difference between two quantized levels of transverse motion with the deduction of the net plasmon energy. The characteristics of photon-plasmon radiation are investigated.
On Lattice Barycentric Tetrahedra
Brian Mazur
Mathematics , 2004,
Abstract: We say a lattice tetrahedron whose centroid is its only non-vertex lattice point is lattice barycentric. The notation T(a,b,c) describes the lattice tetrahedron with vertices {0, e_1, e_2, a e_1 + b e_2 + c e_3}. Our result is that all such T(a,b,c) are unimodularly equivalent to T(3,3,4) or T(7,11,20).
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