H. Sivert. University of Indianapolis.
The sympathetic supply of the stomach was by the greater splanchnic nerves through the coeliac plexus purchase discount nolvadex line. The roots of the greater splanchnic nerves arose from as high as 4th thoracic ganglion and as low as 10th thoracic ganglion: even variable origins in each side of the same specimen were observed buy nolvadex with american express. In the majority of cases cheap nolvadex master card, the segmental origin of the greater spanchnic nerve was found to come th th from the 6 to 9 thoracic ganglia (78% on the right side and 84% on the left side). In most of the cases, the parasympathetic nerves were seen to arise from a single anterior vagus and, a single posterior vagus (73. However, in 8 cases, two anterior vagal trunks and one posterior vagal trunk were seen (17. The histological examination of the distribution and the mode of termination of the gastric nerves were determined in the stomachs of 15 human adults, 3 human fetuses, 8 albino rat, and 4 specimens from operative biopsy tissue by using various neurohistological and histochemical techniques. Nerve plexuses and ganglia were observed in the submucosa, muscular, and serosa layers of the stomach. Free as well as encapsulated endings were observed in the wall of the stomach of human and albino-rats. The type of nerve endings were free and free but organized endings such as loop-like endings. Pharmacological experiments were done in the stomachs of 2 albino-rats to prove the sympathetic and parasympathetic activities. Sympatho- mimetic agents were seen to evoke inhibitory responses where parasym-pathomimetic agents were found to evoke excitatory responses. Neurohistological and histochemical studies were done on the specimens from fifteen human adults, three human fetuses, eight albino-rats, and four specimens from human operative biopsy tissue. All parts of the stomach were supplied by the gastric branches of the coeliac plexus formed by both th th vagi and greater splanchnic nerves mainly from 6 to 9 thoracic ganglia. Neurohisto- chemically nerve plexuses and ganglia were observed in the submucosa, muscular, and serosa layers of the stomach. Intraepithelial free nerve endings, free but organized nerve endings such as loop-like endings and encapsulated endings such as Meissner s corpuscle and small bulbous corpuscles were 190 Bibliography of Research Findings on Gastrointestinal Diseases in Myanmar seen. Histochemicaly, acetylcholinesterase - positive ganglia, varicose nerve fibres and formaldehyde fluorescent nerve plexus were observed. Pharmacological experiments with sympathomimetic agents, sympatholytic agents, parasympathomimetic agents, and parasym- patholytic agents were done in the stomachs of two albino-rats to prove the sympathetic and parasympathetic activities. The review also outlines the rational approach to promotion of growth of Myanmar children. Studies conducted in Myanmar have shown that rice malabsorption is common in children, and may occur in up to two thirds of the population. It is possible that Helicobacter pylori infection frequently acquired during childhhod in developing countries has an impact on small bowel function. The precise mechanism is unknown but it has been proposed that it relates to the impact of infection on acid secretion, resulting in hypochlorhydria which may open the gate to enteric infections, small bowel bacterial overgrowth, and associated carbohydrate malabsorption. Elucidation of these mechanisms would allow a rational approach to promotion of growth of Myanmar children. An increase in the number of siblings was also found to be a high risk factor for H. Density of living, drinking water source, and type of latrine were not significantly associated with H. The findings indicated that intrafamilial transmission could play an important role in the high prevalence of H. Before implementation of clinical use of such a serological test requires validations for local use. Again growing popularity of "test- and-treat" policy requires evaluation of usefulness of such serological test-performance among under and over forty-five years age groups. The objectives were: a) to compare the gastric acid secretion together with urine acid output between malnourished and well-nourished children, b) to determine the relationship between the gastric acid secretion and urine acid out put. The study was carried out during June to December 2000 at the Yangon Children Hospital. Gastric acid secretion and urine acid output level before and after coffee stimulation in 40 malnourished and 20 well-nourished children. It was found that there was significantly decreased volume of stimulated gastric acid secretion within first hour (17. However, there was no significant quantitative relationship between gastric acid secretion and urine acid output in both malnourished and well-nourished children. Malnourished children were unable to respond appropriate to a stimulus for gastric acid production, poor response was markedly observed in children with kwashiorkor and lesser extent in marasmic-kwashiorkor children. All these patients underwent semi-urgent haemorrhoidectomy (Standard Ligation and Excision). During hospital stay, early post-operative complication were elected and compared with other series. On each visit of the follow-up, late post- operative complications was explored and the results were also compared and discussed with the other series. Study was done regarding the incidence, clinical presentation, pathological staging and type of operation and postoperative complication. The youngest one was 23 years old man (medical student) the oldest one was 75 years old man. However, the peak age incidence as well as average age incidence was one decade earlier than the counterparts in the Western countries, but similar to that of Egyptians and South African Bantu. But the commonest symptoms of colorectal cancer are extremely varied and nonspecific. But the commonest symptoms after final result include bleeding per rectum (50%) and changing bowel habit (46%). Regarding distribution of colorectal cancinoma in this study, in most of the patients, tumour were siturated in the rectum (50%). Microscopic manifestation revealed that, most of the cases were adenocarcinoma (69. According to histological grading, most of the cases were placed in moderately differentiated (54. In clinical staging, most of the cases by the time of admission were more or less in advance stage and so there was staging of Dukes C2 (44. Duke B is only seen in 5 cases 193 Bibliography of Research Findings on Gastrointestinal Diseases in Myanmar (10. Because of most of the cases in this study was rectal tumour, abdomino-peritoneal resection 34. Immediate postoperative complication in this study shows mainly of local complication likes wound sepsis including both abdominal (10.
In this application was used a database with over 150 patients with hepatitis B virus infection purchase nolvadex line. Medical Predictions System Bayes s theorem is a formula with conditioned probabilities purchase 20mg nolvadex. If it is applied in medical diagnosis cheap 20mg nolvadex visa, its form is: p( S | Dk ) p( Dk ) p( Dk | S ) = (1) p( S ) where Dk is a disease and S a set of symptoms. Using the theorem it can be calcu- lated, for a patient, the probability of appearance for each disease Dk when the set of symptoms S is present. This formula will be applied for each evolutional type and each form of hepatitis B disease, offering for each one a plausibility score. Such an expert system could be successfully used if it is developed for mutual exclusive diseases and independent symptoms. But sometimes these restrictions cannot be accomplished because there are situations when some symptoms have the same cause (being connected) and a patient can suffer of more than one dis- ease. It was also observed that Bayes s theorem needs an excessive calculation time if statistical population is very large. In order to avoid these problems, two other statistical algorithms were implemented: Aitken s formula and Logistic model. Aitken s formula  is an alternative for equation (3) (which is the most time con- sumer in Bayes s theorem). Medical Predictions System p( E ) p( E ) o( E ) = = (10) p( E ) 1 p( E ) and conditioned anti-probability: p( E | F ) o( E | F ) = (11) p( E | F ) From (10) and (11), where E and F are two events, can be written equations (12) and (13): o( E ) p( E ) = (12) 1 + o( E ) o( E | F ) p( E | F ) = (13) 1 + o( E | F ) It is easier to calculate o(E|F) than p(E|F). B Artificial Neural Networks There are a lot of cases when is not possible to implement human intelligence with expert systems. The initial idea was that in order to reproduce human intelligence, it would be necessary to build systems with a similar architecture . Artificial neural networks are developed based on brain structure, representing a simplified mathematical model of central nervous system. They are made by artificial neurons, which implement the essence of biologi- cal neuron. In this system, artificial neural networks are used in order to make some predic- tions regarding the treatment response for a patient infected with hepatitis C virus. Hepatitis C is a serious and frequent disease and its evolution has to be carefully overseen during the treatment. Even the efficiency of the hepatitis C treatment improves continuously, the burden of this infection will remain a major issue for the next several decades. The system offers for each evaluated biological indicator predictions regarding the next 12 months evolution, indicating its growing tendency, its stabilizing or de- creasing tendency. It was developed using feed-forward neural networks with back-propagation learning algorithm. Each neural network has a layer of 10 hidden neurons, a single output unit and a variable number of inputs. For each of the four biological indicators that have been studied, there are four layers of neural networks. The advantage of this architecture is that the input data are processed separate for each biological indicator. The disadvantage is that the errors are propagated through the system because the results of the networks from the first level (to- gether with their errors) are used in the following levels. It develops a multifunctional database and imple- ments an expert system used in order to diagnose different types of hepatitis and to realize some predictions regarding the evolution of the patient and the response to the treatment. The system uses two major components (an inference machine and an architecture of neural networks) that operate on the multifunctional data- base (Fig. It has an interdisciplinary character and fulfils the requirements of a system used in medical diagnosis and prediction. The user has to set the values of the markers that determine which is the hepatitis type. If the human expert needs more predictions regarding the diagnosis, than he can use the other two branches of the application. After that, he will choose one of the three implemented algorithms (Bayes s theorem, Aitken s formula, or Logistic model) and the plausibility scores for each evolutional type and grade of hepatitis B are calculated (as can be seen in the right part of Fig. These statistical algorithms are using a part of the multifunctional database: 165 patients infected with hepatitis B virus. The data which describe medical status of these patients were collected from Clinical Hospital of Infectious Diseases No. It is also necessary to introduce the values of the biological indicators before the treatment. The system will predict the evolution of the biological indicators depending on the treatment. Looking at the predicted tendency of the biological indicators during the treatment, a physician can estimate if the patient will respond to a treatment or not. All these are stored in another part of multifunctional database, which con- tain almost 200 patients infected with hepatitis C virus. These real data were col- lected from Country Clinical Emergency Hospital, Timisoara. Conclusions This paper tried to evidence some important aspects connected to medical deci- sion making. First of all, logical inference is used to decide what type of hepatitis virus is present for a new patient. After that, the sec- ond part of the system will be used to see what will be the type and the grade of hepatitis B (if the patient is infected with hepatitis B virus). The third part of the system is made for the patients infected with hepatitis C virus and it predicts the biological parameters evolution during the treatment using artificial neural net- works. The hepatitis is a serious disease, its treatment is expensive and severe side effects can appear very often. Therefore, it is important to set a correct diagnosis and to identify those patients who most probably can react to the treatment, so that the others can be protected from a treatment with no benefits. Zurada: Introduction to Artificial Neural Systems, West Publishing Company, United States of America, 1992  D. Niedermayer: An Introduction to Bayesian Networks and their Contem- porary Applications, www. Pescaru: Expert Systems, Politehnica University Timisoara, 2000  The Statistics Homepage: Neural Networks, www. Marino: Artificial Neural Networks for the Prediction of Response to Interferon plus Ribavirin Treatment in Pa- tients with Chronic Hepatitis C, in Current Pharmaceutical Design, Vol. The proposed work encompasses the principles of enhanced recovery that we know can deliver better patient experience as well as a more efficient elective care pathway and can lead to the delivery of the best possible quality of care for patients. Sharing examples of good practice provides an opportunity for colleagues to review their own pathways in light of the importance of integrated and person-centred care. It will also provide commissioners with the information they need to support the commissioning of high quality care. I commend the Royal College of Anaesthetists Perioperative Medicine Programme which I believe could reduce variation and improve patient outcomes after surgery.
But dose (compared with X-rays) purchase 10 mg nolvadex mastercard, that might help put clinical benefts still remain partially unknown purchase nolvadex online from canada. The It is interesting to mention that not only long frst randomised trials are also being conducted buy discount nolvadex. It is also important to stress that optimal conformality to the target, along with sparing of critical structures, can only 11. This would represent about indications 20 25000 new cases per year in countries such as France, Italy or Germany. Tese values exceed by The clinical experience has involved approxi- far the current capacities of hadron-therapy pro- mately 15,000 patients worldwide, mostly in Japan. This might favour comparative p vs X-ray evaluations, highly suitable in the context of dramatic technological progress, for both. As for C-ions, it will remain for a long time beyond the scope of most oncological groups, with hopefully the exception of few dedicated centres able to pro- mote advanced research programmes. Outlook l l l 56 Despite the heated debate on the cost/beneft ratio, Next steps here are the development of smaller hadrontherapy is rapidly expanding in Europe and and cheaper accelerators and beam delivery Asia. The superior dose distribu- uncertainty, one of the main concerns in the tion in hadrontherapy compared to conventional treatment of tumours close to critical organs X-ray therapy is a consequence of basic nuclear phys- or moving targets, such as non-small-cell lung ics. Gating, rescanning, and tracking are contend that an improved dose distribution does possible solutions to the problem of the inter- not necessarily lead to improved clinical outcome. Patients with the highest priority Real-time measurement of the 3D dose distribu- for hadrontherapy are presently those afected by tion is important for fast scanning beams and chordomas/chondrosarcomas of the skull base, sof rescanning methods. For example, high-gran- tissue and bone sarcomas, large uveal and mucosal ularity tracking calorimeters for the detection melanomas, and most of the pediatric patients eligi- of charged and neutral radiation can be able to ble for radiotherapy. The number of patients eligible determine the Bragg-peak position as well as the for hadrontherapy may largely increase if positive lateral 2D dose distribution. The contribution of nuclear physics to hadron- Beyond protons and carbon ions there is room therapy has been enormous in the past, and can lead for developments in the use of other ions such to further breakthroughs in the future. One of the important challenges of the coming years will be to develop links with these companies: collaborations, evaluation programmes, share of know-how and expertise, etc. Many felds explored for particle therapy research can have signifcant feedback in conventional radiotherapy using X-rays or electrons, which still covers over 95% of the treat- ments. Nuclear physics will play a major role in the development of particle therapy and Europe can lead this feld with existing and future facilities, and extensive expertise in accelerators, detectors, and so forth. Introduction l l l A century ago, the living body, like most of the The discovery of technetium at the Berkeley cyclo- 61 material world, was opaque. Sodium iodide inorganic crystals, cou- impressive achievements of the last ffeen years is pled to a matrix of photomultiplier tubes, are well probably the emergence of molecular imaging. However, it requires a well- established network of cyclotron facilities capable of providing radiolabelled compounds at the patient bed. This chapter highlights state-of-the-art and future prospects of medical imaging, mostly in the feld of nuclear imaging. It focuses on new devel- opments and innovations brought by the nuclear physics community. Diferent sections cover hard- ware and sofware developments in clinical and preclinical studies as well as interface applications with other chapters of this booklet. Ease of use and integration in the clin- 63 ical workfow are well-developed important features. Molecular imaging using radioactive tracers makes use of two distinct types of camera. Data rates are large: image resolution are largely determined by the colli- typically of the order of a million events per second. Collimators Sophisticated algorithms distil 3D images out of the are rather simple mechanical devices that were huge data set thus recorded. The scanner bore of about 70 cm is determined by patient size, the axial length of 20 25 cm is a matter of limiting the costs. Scanners come with research interest in the feld of molecular imag- a collection of sophisticated data and image analy- ing. The necessity of understanding biochemical sis options for specifc scan procedures and clinical processes at the molecular level have stimulated a great advance in technological instrumentation, tions on the maximum volume of injected solution both in hardware and sofware, especially for in-vivo (~10% of the total blood volume). This high-sensitivity instrumentation is especially feld of research is ofen called preclinical imaging. Tese are felds where the technology is High-resolution multi-anode photomultipli- 64 rapidly evolving. Left: ring geometry, where the detectors are arranged in rings surrounding the animal. Right: Example of a rotating detectors confguration with four heads, where each one is in time coincidence with the opposite one. By using large detectors such as a conventional Tese photodetectors will defnitely not only be Anger camera, a very high resolution down to a frac- used for clinical scanners, but they will replace tion of a mm is obtained. Tese photodetectors could be very low because of the pinhole confgu- could also be used to reconstruct the centre of mass ration. A direct conversion solid state detec- with a typical pixel size of 50 micron, is used com- tor ofers a much higher quantum efciency and bined with high geometric magnifcation. In this case, the main challenge is to increase ard way of reconstructing the image employs the 66 the sensitivity and especially the feld of view to Feldkamp algorithm, but iterative methods are obtain ultrahigh-resolution systems able to visual- being increasingly applied. However, they very high resolution, down to tens of microns, and have also gained importance as a means of investi- a large feld of view so that a scan of the entire ani- gation per se in the feld of molecular imaging. Such radiation is non- pharmacodynamic, but not pharmacokinetic stud- ionising, so that it can be considered non-harmful ies. Hence phenomenon of magnetism of the nucleus, one can anatomical information is often mandatory to think of a mechanical analogy with a mass, electri- localise precisely the position of the radiotracer. If the addition, when quantitative information on small centre of gravity of the charge is not on the axis of target sites is needed, anatomical images are needed rotation, the rotation itself generates a small mag- to apply proper corrections for partial volume error. However, resolution); novel methods developed in the last few years allow short rise time to optimise the time resolution. However, the search for new materi- range close to the maximum of energy which can be als that would better meet the requirements for a transferred to the electron via the Compton scatter- more efcient and time performance scanner has ing process, and by taking advantage of the excellent not stopped and in recent years some new candi- timing response of organic scintillators, allowing for dates have emerged. As an optimal timing resolution is related to the Should the scintillators be engineered with a photon counting statistics, it requires the capability photonic crystal pattern, the light collection at the to trigger at very low threshold, with the perfor- surface would be improved. However, despite some mance limit being reached when counting single promising preliminary results, the technology is photons. Teir possible performance is required in order to exploit the raw information limit, however, is in their low gain (5 15), which at best. The construction and the high gain, do not meet two important require- characterisation of the frst prototypes will require ments: compactness and magnetic feld compatibility. The vari- CdTe- or CdZnTe-based detectors are integrated ous performances of these devices are summarised in small modules that couple the semiconductor in Table 2. Additionally, these systems of merit already discussed, is usually segmented and also avoid the motion of the camera head around placed radially with respect to the annihilation vol- the patient.
Numerous other chemical and biologic materials 10 mg nolvadex with amex, mainly industrial or occupational order nolvadex canada, have been implicated more recently in human asthma buy discount nolvadex line. It is important from practical and heuristic viewpoints to determine if the mechanisms of asthma are caused by IgE mediation, nonspecific mediator release, or irritating phenomena that are thought to act by nociceptive reflex parasympathetic stimulation. Methods used to study suspected substances include epidemiologic data, bronchoprovocation, and the ability to block bronchoprovocation by disodium cromoglycate or atropine, as well as attempts to identify antigen-specific IgE or IgG by techniques previously described. Some examples of inhalants to which reactions are thought to be immunologically mediated are salts of platinum ( 269), chrome, and nickel (272). Plicatic acid is able to activate complement and generate chemotactic activity from pooled human serum, but the role of this mechanism, if any, in red cedar asthma has not been determined (274). Only 50% of those affected eventually recover after terminating exposure to plicatic acid. Other examples of occupational asthma occur among snow crab processing workers and individuals who use solder. In the latter case, colophony, a component of flux, is the asthmagenic material (275). Asthma exacerbated by direct irritation of the bronchi is common in clinical practice. Odors from perfumes and colognes, vapors from petroleum products and organic solvents, and fumes from tobacco and cooking oils cause coughing and wheezing in many patients. Metabisulfites, sulfiting agents used as preservatives agents used as preservatives and clearing agents, may act as a nonspecific irritant ( 276). The fumes are created when polyvinyl chloride is cut with a hot wire in the process of wrapping cuts of meat. Multiple epidemiologic studies have demonstrated a correlation between levels of common outdoor air pollutants and hospital admissions or emergency room visits ( 277,278). However, these epidemiologic studies are limited by confounding factors, including air temperature and levels of other outdoor aeroallergens. For this reason, experiments also have been performed under controlled conditions involving short exposures to individual pollutants. Ozone is generated by the action of ultraviolet light on precursor pollutants from such sources as automobiles and power plants. A few studies have suggested that ozone increases allergen responsiveness associated with both asthma and allergic rhinitis. Nitrogen oxides from car emissions also may play a role, although the evidence in controlled exposures is less convincing than for ozone ( 281). One study attempted to sensitize atopic individuals to keyhole limpet hemocyanin, a protein isolated from a marine mollusk, with no known cross-reactive antibodies in humans. Sulfur dioxide is a product of soft coal burned for industrial use and is the substance most closely correlated with respiratory and conjunctival symptoms. Incompletely oxidized hydrocarbons from factories and vehicular exhaust make up the particulate matter visible in any highly populated or industrial area. Carbon monoxide impairs oxygen transport, but its concentration in ambient polluted air is probably important only for patients with marginal respiratory reserve. Most formaldehyde symptoms occur in mobile homes, where large amounts of particle board have been used in a relatively small enclosed space. Concentrations of 1 to 3 ppm or higher may cause mucous membrane symptoms in some individuals; atopic persons may react at lower concentrations. Experimentally, formaldehyde can be rendered immunogenic by the formation of formaldehyde protein complexes. However, it has not been proven that these complexes cause IgE- or IgG-mediated disease, nor has it been proven that inhalation of formaldehyde leads to the formation of formaldehyde protein complexes (284). The term sick building syndrome refers to outbreaks of acute illness among workers in a particular building or area of building. Most buildings in which this has been reported have been energy efficient, with little direct outside air exchange. The symptoms most commonly involve the conjunctivae and respiratory tract, with additional nonspecific complaints such as headache, fatigue, and inability to concentrate. Except for unusual instances of contamination with microorganisms (such as Legionella) or of hypersensitivity pneumonitis, the outbreaks have not resulted in serious morbidity or permanent disability. The cause in more than half of the instances studied has been inadequate ventilation, and symptoms abated when corrective measures were taken. A study in Montreal revealed that workers with Alternaria exposure and sensitivity were more likely to have respiratory symptoms. Exposure was correlated with less efficient filtration systems and could represent a significant avoidable exposure for some individuals ( 285). Specific contamination from inside the building has been observed in 17% of sick buildings. Contaminants have included methyl alcohol, butyl methacrylate, ammonia, and acetic acid from various office machines; chlordane (an insecticide); diethyl ethanolamine from boilers; rug shampoos; tobacco smoke; and combustion gases from cafeterias and laboratories. Alkanes, terpenes, benzenes, and chlorinated hydrocarbons also have been identified in investigations of indoor air. In some instances, indoor contamination may occur from outside of the building: for example, the intake of automobile exhaust from an adjacent parking garage. Formaldehyde is released as a gas ( off-gassing ) from a variety of sources such as foam insulation, new furniture, and carbonless carbon paper. The role of tobacco alone in the sick building syndrome is not clear when adequate ventilation is present, however. Finally, the role of psychogenic suggestion in the sick building syndrome should be considered. Such instances have been reported, based on a variety of inconsistencies in the affected population and the lack of objective findings in both the patients and the building. Immunochemical quantitation of airborne short ragweed, Alternaria, antigen E, and Alt-I allergens: a two-year prospective study. Concentrations of major grass group 5 allergens in pollen grains and atmospheric particles: implications for hay fever and allergic asthma sufferers sensitized to grass pollen allergens. Effect of thunderstorms and airborne grass pollen on the incidence of acute asthma in England, 1990 94 [see comments]. Protease-dependent activation of epithelial cells by fungal allergens leads to morphologic changes and cytokine production. Airborne concentrations and particle size distribution of allergen derived from domestic cats ( Felis domesticus). Measurements using cascade impactor, liquid impinger, and a two-site monoclonal antibody assay for Fel d I. Airborne ragweed allergens: association with various particle sizes and short ragweed plant parts.
9 of 10 - Review by H. Sivert
Votes: 65 votes
Total customer reviews: 65