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This epithelial population renews every 3–5 days from pluripotential stem cells located in the intestinal crypts to ensure cellular integrity all along the intestinal epithelium order genuine kamagra gold on-line. Pluripotential stem cells migrate to the tip of the villus where ﬁnal differentiation takes place  purchase 100 mg kamagra gold visa. Signalling cascades such as the wnt and the Notch pathway are involved in epithelial proliferation and differenti- ation buy kamagra gold discount, essential processes to regulate homeostasis in the intestinal epithelium . Transmission electron micrographs of the intestinal epithelium and the lamina propria of the human jejunum. The intestinal mucosa is responsible for nutrient absorption and water secretion, which require a selectively permeable barrier. The epithelium functions primarily as a physical barrier between the external environment and the internal milieu. It is composed by enterocytes, secretory cells and immune cells, all supported on the basal side by a basement membrane underneath which the lamina propria harbors blood and lymph vessels, resident immune cells and nerve terminals. The epithelial cells are polarized cells bound together through speciﬁc junctions. The apical junctional complex delineates the apical and the basal regions of the epithelial cells. It limits the uptake of microbial and food-derived antigens and prevents the passage of cellular elements across. Most of the immune elements of the intestinal barrier are located in the lamina propria, where they develop innate and adaptive responses in coordination with the nervous system and the epithelium. Although, the most important endeavour of these cells is to maintain the integrity of the intestinal physical barrier, enterocytes reinforce barrier strength by also developing immunologic activity. Enterocytes express innate immune receptors , act as non-professional antigen presenting cells, and release several chemokines and cytokines such as fractalkine  or thymic stromal lymphopoietin  involved in leukocyte recruitment and in dendritic cell regulation. Enterocytes are tightly bonded to each other through the apical junctional complex that separates the apical membrane from the basolateral membrane. The junctional complex limits the uptake of microbial and food derived antigens and prevents the passage of cellular elements across. These protein complexes provide the necessary strength to hold the cells together. In contrast, occludin dephosphorylation at those residues by protein phosphatases, results in redistribution of the protein to the cytoplasm . The claudin family of transmembrane proteins consists of 24 members with a molecular weight ranging from 20 to 27 kDa. Some claudins make up pores that allow preferential passage of speciﬁc ions, while others reduce the transit of speciﬁc ions. Moreover, segmental barrier properties along the crypt-villus axis and throughout the length of the intestine do correlate with the disposition of claudins [52, 53]. In the human intestine, both ileal and colonic mucosa express tightening claudins-1, -3, -4, -5 and -7 [54, 55]. However, the expression of the permeability mediator claudin-2 is restricted to the crypt, in the colon [30, 56], yet detected in the crypt and the villus, in the small bowel . Differences in the expression and distribution of claudins may reﬂect adaptation to speciﬁc physio- logical functions carried out by the different segments down the intestinal tract. This association to the peri-junctional actomyosin ring seems crucial for the dynamic regulation of permeability at paracellular spaces. Up-regulation of zonulin expression increased intestinal permeability to bacterial and gliadin exposure. In fact, this zonulin-mediated intestinal barrier defect has been advocated to play a central role in the origin of celiac disease  and type 1 diabetes . Secretory Cells The intestinal epithelium also houses different types of specialized epithelial called secretory cells that contribute to the reinforcement of the intestinal epithelial barrier, mainly goblet cells, Paneth cells and enteroendocrine cells. Contrary to other cell types, Paneth cells migrate downwards, to the bottom of the crypt, where they synthesize and secrete antimicrobial peptides and other proteins to the intestinal lumen. Certain defects in Paneth may be linked to the pathogenesis of Crohn’s disease [73, 74] and necrotizing enterocolitis [75, 76]. Gut enteroendocrine cells spread all along the intestinal epithelium where they function as highly specialized chemoreceptors sensing changes in luminal osmo- larity, pH and nutrient composition. Although they represent less than 1 % of the entire gut epithelial population, enteroendocrine cells constitute the largest endo- crine organ of the human body. Enteroendocrine cells inform the brain-gut axis mostly through the activation of neural pathways . The Intestinal Immune System Mucosa-associated lymphoid tissue is a diverse and diffuse defence system found at most mucosal surfaces of the body, such as the respiratory system and the eye conjunctiva. The immune response generated by this system provides generalized immunization at all mucosal surfaces . Intraepithelial lymphocytes are found between epithelial cells, above the basal lamina. Lamina propria lymphocytes reside in lamina propria along with many other types of immune cell, such as eosinophils, dendritic cells, mast cells, macrophages or plasma cells (panel 3 of Figs. Lamina propria lymphocytes constitute a much more heterogeneous population, approximately 50 % of which correspond to plasma cells, 30 % to T lymphocytes, and the remaining 20 % to macrophages, dendritic cells, mast cells and eosinophils. Resident B lymphocytes complete their matura- tion into plasma cells, mostly producing IgA, but IgM and IgG. Activated T and B-lymphocytes express α4β7 integrin and mucosal endothelial cells of Peyer’s patches, mesenteric lymph nodes and lamina propria of the small and large intestine constitutively express the mucosal addressin cell adhesion molecule-1 that interacts with α4β7 integrin to recirculate lymphocytes between the blood and the gastrointestinal tract . Peyer’s patches are mac- roscopic lymphoid aggregates found at the submucosal levels in the antimesenteric border of the intestine. The follicle-associated epithelium covering Peyer’s patches contains M cells, another special cell type that plays a role in monitoring the gut lumen and maintaining intestinal barrier function. M cells display several unique properties including apical microfolds instead of microvilli, no mucus layer, and a 4 Intestinal Barrier Function and the Brain-Gut Axis 83 Fig. Peyer’s patches also contain antigen-presenting cells, mainly dendritic cells, but also macrophages. These antigen-presenting cells capture luminal antigens (taken up by M cells in the Peyer’s patch dome), to further process and present them to immunocompetent cells in association with the major histocompatibility complex. It serves the host defence via immediate, but non-speciﬁc, responses to a wide variety of pathogens. Therefore, its localization prevents inappropriate stimulation by ﬂagellin, but allows recognition of invasive pathogens . Antimicrobial peptides are endogenous antibiotics that are constitutively expressed in intestinal epithelial cells, yet may be also inducible in immune cells and Paneth cells . They include compounds such as lactoferrin, hepcidin, bactericidal/permeability increasing protein, lysozyme and overall, defensins and cathelicidins. Defensins are a family of small cationic peptides (29–45 amino acids) that exhibit a wide and potent antimicrobial activity spectrum against gram-negative, and gram-positive bacteria, fungal and yeast, parasites, viruses, and even tumor cells . Although structurally different, most defensins display cationic and amphiphilic properties which confer them the capacity to permeabilize the bacterial cell mem- brane.
The disease may manifest with a prodromal viral disease found in domestic and wild animals cheap kamagra gold 100 mg without prescription. Mode of transmission Rabies is transmitted to humans through close Prodromal phase contact with infected saliva buy generic kamagra gold 100mg line, whether through a • The incubation period is usually 2–8 weeks but bite discount 100 mg kamagra gold free shipping, scratch or lick onto mucous membrane or may be more than a year. It is not, in the natural sense, a disease and brain, or where large amounts of virus are of humans; rather, human cases are incidental to transmitted, result in shorter incubation periods. Epidemiological summary With the exception of Antarctica and Australia, Furious rabies animal rabies is present in all continents. It is • Initial neurological signs may include endemic in wild animals (particularly foxes) in rural hyperactivity, disorientation, hallucinations or areas of northern Europe and is found in most bizarre behaviour. Most infections biting or other bizarre behaviour, alternating with resulting from dog bites occur in the Eastern periods of calm where patients are often cooperative European countries. In an effort to further eradicate the disease followed by severe spasms of the pharynx, larynx in foxes, a campaign began in 1990 to orally and diaphragm that produces choking, gagging and immunise wildlife in European countries. Manifestations • The patient is initially relatively intact mentally, Page 115 Rabies virus infects the central nervous system, with little agitation or confusion, but the mental causing encephalopathy. Once symptoms develop, status gradually deteriorates from confusion to there is no known cure and the disease is always disorientation, stupor and finally coma. Module 4 Page 115 • The acute neurological phase lasts 2–7 days with vigorous washing and flushing with soap and water, the longer duration in the paralytic form. Following this, apply either ethanol (700 ml/l), • Coma may last for hours to months, but in tincture or aqueous solution of iodine or povidone untreated patients, respiratory arrest usually occurs iodine. Even if intensive care facilities are available, The infiltration of human rabies specific complications occur during the coma phase, which immunoglobulin around the wound may be result in death: hypoxia, anaemia, renal failure, indicated in high risk cases, for example, bites cardiac arrythmias, congestive cardiac failure, and sustained in a country where there is a high risk of cerebral oedema. Human rabies Those who work with animals in endemic areas, specific immunoglobulin provides immediate and anyone exposed to an animal bite or lick on passive protection. Rabies immunoglobulin is difficult to access in many areas Diagnosis and rabies vaccine can be expensive (see further No tests are currently available to diagnose rabies notes) so may not be easily available. In the clinical course of the disease, the virus can Now carry out Learning Activity 6. A corneal impression smear and skin biopsies may Nursing care show a positive result; although this will confirm Intensive care facilities can prolong life, but since a diagnosis, a negative result does not exclude death is inevitable, the most humane care for such infection. Postmortem diagnosis can be confirmed patients involves the relief of agony and suffering by examination of brain tissue. Methods of treatment Supportive care for the presenting symptoms There is no specific treatment once the disease is includes: established. Since elimination of the rabies virus at the site of infection by chemical or physical means is the most Infection control effective mechanism of protection, immediate Rabies virus may be present in saliva, tears, urine, Page 116 Module 4 or other body fluids. Therefore, in order to prevent any possible transmission basic precautions, Universal Precautions and transmission based precautions should be taken (see Module 1). While human-to-human transmission has not been recorded, pre-exposure vaccination is recommended for those caring for, or likely to care for, a patient with rabies. Post-exposure vaccine can be given to staff found to be caring for infected patients. Prevention of spread This is dependent upon: • reduction of rabies virus in animal hosts through vaccination campaigns; and • post-exposure treatment following a potentially infected bite. Pre- exposure vaccination does not rule out the need for further vaccine if exposed to the virus. Epidemiological summary • Clinical examination at this stage may also show Thetanus occurs throughout the world and is a rigidity of spinal muscles and board like firmness leading cause of death in many developing of the abdominal muscles. Countries in Europe reporting sporadic cases in • The death rate is estimated at 3 per 100 with recent years include Albania, Azerbaijan, Croatia, good hospital care. Clostridium tetani is Mode of transmission recovered from the wound in only 30% of patients. The bacterium Clostridium tetani is found in the intestinal tracts of man and animals, where it Methods of treatment remains harmless and causes no disease. However, Guidelines for treating wounds spores are produced which are passed in the faeces, Thorough and careful wound cleaning is essential and contaminate the environment. Protection against can persist for years in soil and dust and are resistant tetanus with vaccine and human tetanus to heat, drying, chemicals and sunlight. Thetanus cannot be spread directly by person- • Six hour interval between wound or burn and to-person contact. These spasms are often that shows substantial devitalised tissue, a puncture triggered by sensory stimuli, so a calm, quiet wound,contamination with soil or manure, and the environment should be provided. These may be different in other Thetanus can never be eradicated because the spores are European countries. However, prevention of Specific anti-tetanus prophylaxis Immunization Status Clean Wound – Treatment Thetanus Prone Wound – Required Treatment Required Last of 3 dose course or Nil Nil (a dose of human tetanus reinforcing booster immunoglobulin may be given if within last 10 years infection is considered high e. Patients with mild muscular spasms may be treated Immunization should therefore be given to anyone with infusions of diazepam. Post-exposure prophylaxis with specific human immunoglobulin can be initiated following a Modes of transmission potentially infectious tick bite, but there is no The virus responsible for this disease is transmitted specific treatment for this disease once established. Skin should be inspected Epidemiological summary for ticks every few hours and any ticks found should The disease is endemic in parts of Europe and be removed immediately. Scandinavia, and in forested areas (especially where • Those living in endemic areas should be aware there is heavy undergrowth). Immunization Manifestations A pre-exposure vaccine is available for those likely • The incubation period is 1–2 weeks. The vaccine is will develop after 10 days, characterised by severe widely used to protect special groups of workers headache and fever. Prompt treatment with post exposure prophylaxis Risk factors (specific human immunoglobulin) is available and Tickborne encephalitis is primarily an occupational provides immediate passive protection if given disease affecting soldiers, agricultural workers, and within four days of the tick bite. Urgent diagnosis is required • Faecal-oral spread through eating poorly cooked because sight may be severely and permanently meats, especially pork and mutton. Reactivation of latent illness • Faecal-oral spread through contact with cat’s The most common presentation is as faeces. The diagnosis Vertically: a congenitally acquired infection can of endophthalmitis is by culture of vitreous occur when a pregnant woman acquires an acute humour. Treatment Treatment is usually with oral pyremethamine and Epidemiological summary sulphonamide. Hospital referral is essential for Toxoplasmosis is one of the most common of infants with endophthalmitis. It is more common in countries where important for women during pregnancy and the meat is eaten raw or rare. Advice should include: • wash hands after handling raw meat and poultry; Manifestations • do not touch eyes or mouth whilst handling raw Uncomplicated infection meat and poultry; • Generally asymptomatic • cook meat completely (heat to at least 65° C); • 10–20% of cases will experience a flu-like illness • do not clean cat litter boxes; if unavoidable, wear • The clinical course is benign and self-limiting gloves while doing so; and and any symptoms will resolve within a few • wear gloves when gardening. As an additional precaution for children, keep Page 121 Infection in an immunocompromised patient children’s play areas free of cat excrement. Module 4 Page 121 West Nile fever Definition Manifestations West Nile fever is caused by the West Nile • A flu-like illness characterised by an abrupt onset flavivirus. Wild birds are the principal hosts • Occasionally (< 15% of cases) encephalitis, of this virus, although it has been isolated from meningitis, hepatitis, and myocarditis occurs.
With the right treatment and support generic kamagra gold 100 mg without a prescription, people diagnosed with a chronic disease can improve their health and quality of life buy kamagra gold discount. Management typically involves multi- 5 faceted interventions providing integrated social and medical support for people 12 with chronic conditions buy kamagra gold on line. For example: People with diabetes who attended an interdisciplinary, community-based self-care clinic experienced an average 14% drop in blood glucose levels 13 within one year. A New Approach to Chronic Disease The current health care system was designed to address acute ‘Clients’ in this paper are individuals who use illness rather than chronic health care and other health services, and disease. As a result, medical includes healthy individuals and those suffering from disease. Care tends to be reactive – responding to acute health problems when they present. As a result: Medical practitioners rely on clients to contact the system Patients are usually passive while medical practitioners administer treatment 17 Visits are symptom focused versus patient-centred Promoting the client’s overall health, preventing disease, injury, disability, and ensuring continuity of care across providers are not system priorities. These features render the prevailing model of care inappropriate for tackling chronic disease. For example, in Ontario: 58% of diabetes patients are tested for HbA1C, and of those tested, less 18 than 50% had optimal blood glucose levels. A more responsive approach to chronic disease would recognize that chronic disease: Is ongoing, and therefore warrants pro-active, planned, integrated care within a system that clients can easily navigate Involves clients living indefinitely with the disease and its symptoms, requiring them to be active partners in managing their condition, rather than passive recipients of care Requires multi-faceted care which calls for clinicians and non-clinicians from multiple disciplines to work closely together, to meet the wide range of needs of the chronically ill Can be prevented and therefore warrants health promotion and disease prevention strategies targeted to the whole population, especially those at high risk for chronic disease. Internationally and within Canada there is growing interest in redesigning health care organizations and practice to improve the quality of care and to close the gap in care between what is known to improve outcomes, and what is practiced. This will require health care organizations to re-think current approaches to chronic disease management while exploring ways to build health promotion and disease prevention into health care practice and the lives of their clients. It supports health care system changes from one that is designed for episodic, acute illness to one that will support the prevention and management of chronic disease. In practice, jurisdictions have found that simply adding new elements such as self-management programs or client registries to a system solely focused on episodic, acute care does not change delivery of care substantially or improve health outcomes. Changing delivery of care to improve outcomes requires fundamental system changes in the design of practice and provision of self-management supports. The Framework is a ‘roadmap’ to a chronic care delivery system that provides effective care and better health outcomes. The Framework can be applied to both specific and generic chronic disease practice, and to different types of health care organizations. The Framework’s roadmap for effective chronic disease management addresses the distinct needs of clients with chronic conditions as it aims to provide multi- faceted, planned, pro-active seamless care in which the clients are full participants in managing their care and are supported to do this at all points by the system. Ontarians with chronic conditions will experience a change both in their care and their disease management. They will become equal partners in their own health and full collaborators in managing their conditions, and they will be supported in this. Their care will be organized and delivered to give the expert care they need when and where they need it, without their having to struggle through the system on their own, bounced from provider to provider. Their care will be planned and based on the best evidence, and both providers and clients will be supported in following through with the plan. Effective chronic disease management includes the implementation of prevention measures to halt the disease’s progress and to prevent complications and co-morbidities. Prevention in the Charter includes interventions both to reduce the risk of disease among chronically ill individuals and individuals at high risk of developing disease, as well as broad initiatives to improve health 9 within the population as a whole and prevent new cases of chronic disease from occurring. The Charter identifies five action areas in which to do this: Development of personal skills necessary to staying healthy Re-orientation of health services to greater health promotion and disease prevention Building public policies that promote health and prevent disease Creating environments supportive to health Strengthening community action. Actions in these areas not only address the risk factors for an Determinants of health: individuals’ health, but also • Income and social status address the full range of factors • Education and literacy that determine the populations’ • Social support networks health. The determinants of • Employment/working conditions health range from individual • Social environments genetic make-up to socio- • Physical environments economic factors such as • Personal health practices and coping skills income and education. Community agencies deliver much of the promotion/prevention in Ontario, especially promotion/prevention directed at populations of individuals. The Framework makes community providers important partners, linking them with health care providers – through systematic referrals, collaborations to reach underserved populations – for example, to exploit fully the capacity and resources of both sectors to deliver quality care, support client self-management, and prevent chronic disease. The Framework also promotes broader community strategies – led by individuals, families, advocates, and/or agencies – to improve health and reduce the incidence of disease among Ontarians through activities that address the determinants of health. These outcomes will result from both increased prevention/promotion in clinical practice and in the community, as well as improved delivery of chronic disease care. The improved delivery of care will not only ensure quality care in the appropriate setting by the appropriate provider at the right time, but will also increase efficiency in the system. Evidence also indicates that the Framework’s approach will save health care system resources by reducing hospitalizations and use of emergency departments, reducing duplication of services, and helping Ontarians to stay healthy. As indicated earlier, major chronic diseases and injuries account for 33% of 3٫ 4 direct health care costs and 55% of direct and indirect health costs in Ontario. A high proportion of these costs are consumed by the relatively small proportion of individuals with multiple serious chronic conditions. Studies in British Columbia found that in that province, individuals with very high co-morbidity used seven times the inpatient hospital days, four times the physician visits, five times the home care (nursing, rehab), and two and a half times the home support 25٫ 26 services as the population average. Between 1995 and 2002 the number of acute operating beds decreased from 52,000 to 19,000 and the average daily in-patient population dropped about 60%. In Canada, specific asthma programs featuring treatment, education, assessment and follow-up have been shown to save $501-597 per person 28 enrolled. A recent Alberta study of heart failure care after hospitalization 11 reduced hospital use by an average of 3. The remainder of this section of the paper will be devoted to describing the main elements of Ontario’s Chronic Disease Prevention and Management Framework. Health Care Organizations The health care system is the main provider of health care to chronically ill Ontarians, and a provider of chronic disease prevention. Their role is to champion the Health Care Organizations changes required to shift from reactive episodic acute care to proactive • Strong leadership chronic disease prevention and • Aligned resources and incentives management. Leadership, resources, • Commitment to quality improvement • Accountability for outcomes incentives, and quality improvement across the health care system and within individual organizations, are pre-requisite to successful implementation of the Framework’s practice and system changes. Strong Leadership Strong organizational leadership that visibly supports chronic disease prevention and management is central to success. Committed leaders have a clear understanding of what’s involved, and ‘walk the talk’ through ongoing organizational quality improvement to identify innovative and effective delivery strategies, based on best evidence. They also work to mobilize all partners and stakeholders within the health care sector and community to build an environment and service system that result in optimal care and reduced incidence of chronic disease. Leadership across the health care system must assign human and financial resources to Framework practices and redesign. In most jurisdictions, current incentives and performance measures continue to reinforce acute, episodic care in medical practice. Individual clinicians’ and organizations’ productivity, for example, is still largely measured by numbers of visits and technical procedures completed.