By R. Fedor. East Central University, Ada Oklahoma. 2018.

However buy fildena 100 mg cheap, at least 100 people die annually in removal of the affected tissue is an option to prevent the the United States from anaphylactic shock 150 mg fildena visa. Amputation of limbs is a frequent means of dealing with necrotizing fascitis cheap fildena 25 mg with visa, an infection that is See also Allergies; Immunoglobulins and immunoglobulin inside of tissue (and so protected from antibiotics and the deficiency syndromes 17 Animal models of infection WORLD OF MICROBIOLOGY AND IMMUNOLOGY Drawing depicting Louis Pasteur (right) using an animal model discount fildena 150 mg line. Such work would not Animal models of infection have been possible without the use of animals cheap fildena 100 mg on-line. The use of various animals as models for microbiological Subsequent to Pasteur, the use of animal models for a infections has been a fundamental part of infectious disease myriad of bacterial and viral diseases has led to the production research for more than a century. Now, techniques of genetic of vaccines to diseases such as diphtheria, rabies, tuberculo- alteration and manipulation have made possible the design of sis, poliomyelitis, measles, and rubella. Animal models are also used to screen candidate drugs animals so as to be specifically applicable to the study of a for their performance in eliminating the infection of concern myriad of diseases. While some The intent for the use of animals as models of disease is of this work may be amenable to study using cells grown on to establish an infection that mimics that seen in the species of in the laboratory, and by the use of sophisticated computer concern, usually humans. By duplicating the infection, the rea- models that can make predictions about the effect of a treat- sons for the establishment of the infection can be researched. Development of a vaccine to the particular A key to developing an animal model is the selection of infection is an example of the successful use of animals in an animal whose physiology, reaction to an infection, and the infectious disease research. The study of an infection that bears caused by bacterial infection grow from animals studies by no resemblance to that found in a human would be fruitless, Louis Pasteur in the mid-nineteenth century. The use of ani- in terms of developing treatment strategies for the human mals as models of cholera and anthrax enabled Pasteur to condition. Accounts by the Huns during their development of animal models that are specifically tailored sweep across Eurasia in 80 A. One example is the so-called nude mouse, their horse and cattle attributed to anthrax. These animals, which derives its name from the fact that it has no hair. Indeed, mice lack a thymus, and so are immunodeficient in a number loss to European livestock in the eighteenth and nineteenth of ways. Use of nude mice has been very useful in the study centuries stimulated the search for a cure. In 1876, Robert of immunodeficiency diseases in humans, such as acquired Koch identified the causative agent of anthrax. As well, this animal model The use of anthrax as a weapon is not a new phenome- lends itself to the study of opportunistic bacterial infections, non. In ancient times, diseased bodies were used to poison which typically occur in humans whose immune systems are wells, and were catapulted into cities under siege. In World War II, Japanese and animals have proven to be useful in infectious disease German prisoners were subjects of medical research, includ- research. These animals include the rabbit, rat, guinea pig, pig, ing their susceptibility to anthrax. Britain actually produced five million anthrax cakes at tives to humans. Thus, for example, mouse models exist in which exposure to the natural reservoirs of the microorganism; live- the activity of certain genes has been curtailed. The involvement of the gene acquired by workers engaged in shearing sheep, for example. Cutaneous anthrax refers to the entry of the organism through The data from animal models provides a means of indi- a cut in the skin. Gastrointestinal anthrax occurs when the cating the potential of a treatment. With prompt treatment, the cutaneous form is provides a guide towards establishing the optimal treatment in often cured. In other words, the animal model can help screen and lethal in 25–75% of people who contract it. Inhalation anthrax eliminate the undesirable treatments, narrowing the successful is almost always fatal.

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COMPLEMENTARY ALTERNATIVE MEDICINE (CAM) Families may use complementary alternative medicine buy 25mg fildena with visa, including acupuncture fildena 50mg without prescription, cra- niosacral therapy cheap fildena 50 mg without prescription, myofascial release cheap 150mg fildena free shipping, therapeutic taping 150 mg fildena with mastercard, diet and herbal remedies, 22 Puscavage and Hoon electrical stimulation, constraint-induced training, chiropractic treatments, massage and hyperbaric oxygen. While there are individual reports of improvements with various alternative therapies, some carry substantial risks. Furthermore, rigorous studies have not been conducted to assess efficacy. Prior to utilizing these therapies, cost, efficacy, and potential side effects should be carefully considered. CONCLUSIONS Despite the wide range of available interventions with demonstrated benefits in individual children, there is currently no clear consensus regarding the nature of optimal therapy(ies), as well as timing and duration of specific interventions (8–11). Further advances in treatment will require controlled trials, matched on etio- logical antecedents and using reliable, valid quantitative measurement systems to assess effectiveness. Singer and Kossoff, the authors acknowledge the thoughtful comments of numerous Kennedy Krieger Institute physicians, clinicians, and thera- pists, including Drs. Michael Johnston, Charles Silberstein, Frank Pidcock, Bruce Shapiro, Eric Levey, and Elaine Stashinko; Ms. This WE MOVE web site offers informa- tion and support for healthcare professionals and others whose lives are affected by pediatric movement disorders. United cerebral palsy (UCP) is the leading source of information on cerebral palsy and is a pivotal advocate for the rights of persons with any disability. As one of the largest health charities in America, UCP’s mission is to advance the independence, productivity, and full citizenship of people with cerebral palsy and other disabilities. The Children’s Hemiplegia and Stroke Association, a non profit organization, offering support and information to families of infants, children, and young adults who have hemiplegia, hemiparesis, hemiple- gic cerebral palsy, childhood stroke, infant stroke, or in utero stroke. This web site is provided for the parents, sib- lings, physicians, and therapists of children born with lissencephaly (smooth brain), and other neuronal migration disorders. Exception Parent magazine’s on-line resource, pro- viding information, support, ideas, encouragement, and outreach for parents and families of children with disabilities, and the professionals who work with them. Neurosurgical treatment of spasticity and other pediatric movement disor- ders. Evidence of the effects of intrathecal baclofen for spastic and dys- tonic cerebral palsy. Diseases of the Nervous System: Clinical Neuroscience and Therapeutic Principles. Hoon AH, Freese PO, Reinhardt EM, Wilson MA, Lawrie WT, Harryman SE, Pidcock FS, Johnston MV. Age dependent beneficial effects of trihexyphenidyl in children with extrapyramidal cerebral palsy. Spasticity associated with cerebral palsy in children: guidelines for the use of botulinum A toxin. Therapeutic choices in the locomotor management of the child with cerebral palsy—more luck than judgement? Qualitative analysis of therapeutic motor interven- tion programmes for children with cerebral palsy: an update. Avellino Division of Pediatric Neurosurgery, Children’s Hospital and Regional Medical Center, University of Washington School of Medicine, Seattle, Washington, U. INTRODUCTION Hydrocephalus is the abnormal accumulation of cerebrospinal fluid (CSF) within the ventricles and subarachnoid spaces. It is often associated with dilatation of the ven- tricular system and increased intracranial pressure (ICP). The incidence of pediatric hydrocephalus as an isolated congenital disorder is approximately 1=1000 live births. Pediatric hydrocephalus is often associated with numerous other conditions, such as spina bifida, tumors, and infections. Hydrocephalus is almost always a result of an interruption of CSF flow and is rarely because of increased CSF production. CLINICAL PATHOLOGY—SITE OF OBSTRUCTION Historically, hydrocephalus has been classified as obstructive or nonobstructive,a somewhat misleading classification because all forms of hydrocephalus, except hydrocephalus ex vacuo (resulting from brain atrophy), involve some form of CSF obstruction. A more commonly used classification differentiates hydrocephalus between communicating or noncommunicating (Table 1). Traditionally, this classifica- tion was based on whether dye injected into the lateral ventricles could be detected in CSF extracted from a subsequent lumbar puncture.

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In others persisting feeding difficulties even- tually necessitate insertion of a gastrostomy tube fildena 25mg without prescription, with or without fundoplication buy fildena 25 mg lowest price. In older patients bulbar dysfunction can cause chewing and swallowing difficulties and recurrent aspiration discount fildena 50mg visa, and in combination with facial weakness may cause dysarthria and poor control of secretions cheap fildena 150 mg overnight delivery. Ideally cheap fildena 25 mg otc, such a program should become integrated into the child’s day-to-day activities. Orthotics, splinting and serial casting may be necessary for mild joint contractures. Surgical release may be indicated for contractures that do not respond to aggressive physiotherapy. All patients with congenital myopathy should be monitored for the develop- ment of scoliosis and kyphosis. Progressive spinal deformity can cause pain, impede motor function and independence, and further compromise respiratory function. Spinal bracing does not cor- rect, prevent or reverse spinal curvature but may improve sitting stability and is an option in nonambulatory children. Surgery is indicated if the curve is progressing, pulmonary function is impaired, and spinal fusion is unlikely to impair motor func- tion. The most important factors related to the timing of surgery are a persisting degree of flexibility of the spine and a stable pulmonary forced vital capacity that is more than 30% predicted value. PROGNOSIS Most of the congenital myopathies are static or slowly progressive disorders. Man- agement of these conditions is predicated on prediction and prevention of disease complications. Over the next few years, it is likely that genetic loci for the majority of congenital myopathies will be identified, in the first step towards a better under- standing of the pathogenesis of these disorders, and the development of curative rather than symptomatic therapies. INTRODUCTION Spinal muscular atrophy is a term applied to both a specific and common disorder, and to a group of related but individually rare disorders. The specific, common dis- order is also known as childhood spinal muscular atrophy, proximal spinal muscular atrophy, and historically has been broken up into several subgroups labeled SMA 1 (Werdnig Hoffmann disease), SMA 2 (intermediate childhood SMA), and SMA 3 (Kugelberg Welander disease). All of these labels refer to a recessively inherited genetic disorder caused by mutation of the survival motor neuron gene, SMN. The group of disorders collectively known as the spinal muscular atrophies (Table 1) is diverse in many respects. Some are well characterized genetically by defined muta- tions in known genes, some are clearly genetic from their inheritance pattern but as yet involve unknown genes, and others affect single patients in a manner that suggests a genetic etiology that yet remains unproven. Both the specific SMN-related SMA and the broad range of SMA disorders share in common certain clinical features including slow progressive, symmetric and often diffuse weakness caused by degen- eration of the primary motor neurons. Symmetric dysfunction and degeneration of spinal and bulbar motor neurons may be a feature of other disorders (Table 2). SMN-RELATED SMA Clinical Appearance and Diagnosis Affected individuals initially manifest weakness over a range of ages beginning pre- natally to young adult years or possibly later. Infants with the common, and well recognized, type 1 SMA (Werdnig–Hoffmann disease) typically are normal at birth but develop weakness of limbs, trunk and neck in the first few months of life. The arbitrary division of type 1 from type II SMA involves the inability to maintain, at any point in the course, an independent sitting position. Infants with type I SMA often have a bright and intelligent appearing face, particularly of the eyes, a strong diaphragm, and normal tone of the anal sphincter but weakness diffusely else- where. A ‘‘frog leg’’ recumbent posture with the legs fully externally rotated, knees and hips partially flexed, arms internally rotated at the shoulder and often extended 191 192 Crawford Table 1 Potential Mimics of Spinal Muscular Atrophy Brain Degenerative disease Hypotonic cerebral palsy Congenital Myotonic Dystrophy Prader Willi syndrome, other genetic disorders a Spinal cord=column Trauma Structural disorders: e. In this form of SMA tongue ‘‘fasciculations’’ are common, but by itself this is a nonspecific feature that often leads to diagnostic error. Infants and children with type II SMA typically manifest weakness at a later age, usually prior to 18 months of age. While able to sit, they cannot maintain a standing position sufficiently well as to take a step—the arbi- trary dividing line that distinguishes type 2 from type 3 (Kugelberg Welander) SMA. Individuals with type 2 or 3 SMA often manifest a characteristic tremor, very fine and irregular tremor, termed ‘‘minipolymyoclonus,’’ in the fingers when held outstretched. Those with type 3 SMA may manifest weakness at any time in childhood or even as young adults—in which case some investigators apply the term SMA type 4.

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Some questions that might help you in writing your conclusion are: ° What are the main points of your essay? ESSAYS 179 ° a change in attitude ° a change in knowledge ° a change in how to apply theory to practice ° a change in awareness ° a change in understanding 50 mg fildena. Like the introduction generic 150mg fildena overnight delivery, the conclusion forms about 12 per cent of your es­ say – so in a 2000 word composition you would plan to have a conclusion of about 250 words generic 25mg fildena mastercard. Writing drafts Views are mixed about whether writing several drafts is a good idea or not proven fildena 150 mg. Some advise writing coursework essays under exam conditions as practice for timed examinations buy fildena 50mg on line. This may help in preparing you for your exams, however it is unlikely to help you in producing your best piece of work. I would recommend that, like any other written task, you take the opportu­ nity to draft your essay and revise it as necessary before you submit it. Use the checklist in the ‘Action Points’ at the end of this chapter to help edit your draft. Assessment criteria There is no set marking scheme that is used as a standard by all tutors for assessing essays. The way in which this type of written work is assessed 180 WRITING SKILLS IN PRACTICE varies between markers and between institutions. Some tutors work out a system where a set amount of marks is awarded to each main point covered in the essay. The accumulated figure is then converted into a percentage, which in turn may be used to place the stu­ dent within a band or grade. This tends to work well with descriptive questions, but is less useful for essays where a greater depth of understand­ ing needs to be demonstrated by the student. Analytical questions benefit from an approach where assessment is based on a variety of criteria that reflect several subsets of skills. The marker will be looking for evidence of the student’s performance in each of these skill areas. Knowledge of the subject ° Evidence – ° Able to recall facts and figures accurately. Understanding of the subject ° Ability to analyse information Evidence – ° Able to identify key components of an idea or concept. Essay skills ° Interpretation Evidence – ° Identified key elements of the title. Marking schemes are devised in a way that helps the tutor allocate marks according to the degree that the student has met the criteria. For example: ESSAYS 183 Knowledge detailed 5 4 3 2 1 sketchy in-depth 5 4 3 2 1 shallow thorough 5 4 3 2 1 superficial Tutors may use a weighting system so that certain skill subsets receive a higher percentage of the marks. Submitting your essay Ask your tutor or refer to your institutional guidelines about presentation and submission of your essay. It is vital that you comply with these other­ wise you may lose marks or have your essay rejected. In general essays must be: ° Typed – most institutions require essays to be either typed or word-processed on one side of good quality A4 paper. Leave space at the end or add a blank sheet for the marker to put your grade and sum up his or her views. The structure of your essay q Your introduction is brief and states the what, why and how? The content of your essay q There is a balance in what you have presented. You have indicated the sources for your essay q Your sources are cited in the text. You have complied with the terms of reference q Length is within the word limit. Summary Points ° Essays are a means for tutors to gauge the level of individual students’ performance. These will tell you both the topic and the approach you need to take in writing the essay. Although students will know the structure of the assessment, the specific content of the exam pa­ per is unseen. Unlike coursework these assessments are sat under exam conditions within a specified time period and invigilators are present to ensure that the regulations are met. An identical exam paper is used to as­ sess students who are at the same point in their studies as parity in assess­ ment is imperative.

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All who knew him could appreciate During his tenure as secretary of the Academy the high quality of this man cheap fildena 50 mg with visa, especially the young best fildena 150 mg, (from 1947 to 1952) buy 50 mg fildena overnight delivery, there was no full-time exec- for he could always find the time to be with them utive director; he always believed that one of his and to let them know that he appreciated their major contributions to the Academy was his part efforts purchase fildena 100mg otc. Charles Heck that he should ladder; you may pass them again on the way leave an excellent orthopedic practice to become down 50mg fildena for sale. His vast knowl- Photography was one of his few hobbies, and edge of medicine and his ability to evaluate many have enjoyed his travelogue sound-slide people objectively, as well as his willingness to programs. The first was a result of his camera listen and provide service and his extraordinary hunt of wild game in Africa. Background music judgment were such that he developed a large was provided by his close friend, Hugh Smith. Many patients This was the stimulus for the educational sound- from Central and South America sought his slide program of the Academy. He truly enjoyed the practice of medicine, Traveling was his true avocation. He and his and no problem was too small to attract his wife, Jean, meticulously planned the trips, read interest. He was truly a usually knew more of the history of an area than surgeon’s surgeon. He always could find time to allowed him to apply his great knowledge of visit some medical institution or friend, and often anatomy and vast surgical experience, so that he did some lecturing on these trips. He enjoyed official orthopedic ambassador to Central and teaching while he was operating or assisting a South America, as well as to Europe and the Far young surgeon, and emphasized atraumatic tech- East. He was a master in manipulation of frac- subsequently led to the first group of orthopedic tures of the proximal end of the femur and surgeons sponsored by the American Orthopedic especially in supracondylar fractures of the Association visiting the orthopedic centers of that humerus in children. Boyd always was interested in research and poorly, he informed them that their English was very cognizant of the need for both laboratory and much better than his Japanese, Portuguese, or clinical investigation. Boyd enjoyed teaching—whether from the bone grafting for nonunion, femoral neck and podium, in the operating or dressing room, or trochanteric fractures, and dislocations of the even over a meal—and for these sessions many shoulder. His original contributions were in the medical students, residents, and practicing physi- areas of dual-onlay bone grafts for nonunions, an cians are most indebted to him. He carefully pre- anatomical approach for exposure of the radial pared his lectures so that they were clear and head and neck and proximal end of the ulna, concise, with faultless slides, and did not exceed amputation of the foot with tibiocalcaneal fusion, the allotted time. He always was Campbell Clinic and Professor and Head of the interested in innovations and had the ability to Department of Orthopedic Surgery at the Univer- identify clinical applications, such as compres- sity of Tennessee, he spent a considerable amount sion plates for the fixation of forearm fractures, of time teaching, and was always able to combine 34 Who’s Who in Orthopedics patient care in the outpatient department, surgery, or the emergency room with teaching. During medical school he had to spend a year in bed because of pulmonary tuberculosis, and probably it was during this time that his lifelong reading habits developed. He enjoyed relating to others what he had just read and would loan or give articles or books to anyone he felt would benefit from or enjoy them. One of his favorite books was The Precepts and Counsels on Scientific Investigations by Raymon Cajal, which is now available only through the National Library of Medicine. Boyd liked to talk about his trips, his reading, and his orthopedic experiences. Often he apologized for Elliott Gray BRACKETT talking too much, but his phenomenal memory and his knowledge of the Bible and of medical 1860–1942 and nonmedical matters provided a vast amount of material from which to draw. Humor, com- bined with some significant point, was typical of Although Elliott Gray Brackett was not a founder his conversations: “You can’t chew gum and look of the American Orthopedic Association, he was intelligent at the same time. Let the other person make the various official capacities than anyone else. He’s trying to tell one who, from the very beginning of his mem- you what’s wrong with him. Harold Buhalts Boyd died at the age of 76 chronic diseases in bones and joints, and of in retirement in Oceanside, California, on May related conditions, that appeared to call for 29, 1981. Brackett attached himself in 1889, 2 years after the founding of the Association. It was but natural that he should have chosen this line of work, for a personal experience with a crippling affection, which confined him to bed for a year while he was a student in Harvard Medical School, coupled with the fact that Dr. Bradford took care of him through this illness, would have made a man of Dr. Brackett’s sympathies turn to a specialty where he could be 35 Who’s Who in Orthopedics of the greatest service. Brackett in his Presidential Address in his judgment has been amply justified.

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