By G. Reto. University of San Diego.
On the following encounter with the allergen generic 20 mg apcalis sx, IgE bound to Fcε receptors on mast cells are crosslinked by the allergen purchase apcalis sx 20 mg line, leading to mast cell degranulation with secretion of histamine and chemoattractants. The resulting inflammation is initially characterized by histamine-induced hyperemia and edema (redness and swelling), later by a cellular infiltrate accentuated by eosinophils. Mast cells are localized mainly below epithelia that are entry barriers for parasites, such as skin and the mucosa of respiratory and gastrointestinal tracts. Innocuous antigens entering the body via these routes, mostly by inhalation or ingestion, are mistaken for dangerous parasites. Examples for antigens triggering type I reactions: Inhalation allergens: -Pollen from • grasses: timothy, cocksfoot and ryegrass, but also crops like rye • herbs: mugwort, ribwort/plantain, ragweed • trees and shrubs: birch, alder, hazel -Fungal spores: Aspergillus, Alternaria, Cladosporum -Animal antigens: epithelia of cats and dogs, parakeet dung, feathers -House dust mite antigen Today, one of the most common causes of "hay fever" or allergic asthma is the antigen Der p 1 from fecal particles from the house dust mite (Dermatophagoides pteronyssinus). A decisive factor for the antigenicity of Der p 1, which functions as a digestive protease, is its enzymatic activity: it cleaves components of tight junctions between respiratory epithelial cells, enabling it to negotiate the epithelial barrier. Food allergens: (*denotes pollen allergy-associated food allergies) -Nuts: peanut (actually, a legume), almond*, hazelnut* -Fruit: kiwi fruit*, apple* -Vegetables: fennel, celery* -Milk: α-lactoglobulin, β-lactoglobulin, casein -Eggs: ovalbumin -Fish: bass, salmon -Seafood Drugs taken orally, like penicillin, can cause type I reactions, too. Food allergy causes symptoms in the gastrointestinal tract like diarrhea, nausea and vomiting, but may also cause problems in other organs: coughing or asthma in the respiratory tract and urticaria (hives) in the skin. If mast cell degranulation is systemic, vasodilatation may cause a dip in blood pressure, fainting or, in the worst case, anaphylactic shock. Lactose intolerance is a shortage of the intestinal enzyme lactase, which cleaves the lactose disaccharide into monosaccharides glucose and galactose. Due to the osmotic effect of uncleaved lactose, as well as by secondary changes in bacterial colonization, affected individuals suffer from diarrhea in response to lactose intake (milk, cheese, chocolate,. It is very common in the tropics, and, due to counter selection, less common in individuals stemming from those northern parts of the world where people relied on animal milk for a large part of daily nutrition (e. Other examples of pseudo-allergies are fructose intolerance (fruit), or scombroid food poisoning, caused by histidine-derived histamine on the surface of insufficiently refrigerated fish. Type I reactions are most frequently caused by inhalation or ingestion, but other routes are possible. Latex particles sometimes cause hives and itching in sensitized persons by direct contact to the skin. The most efficient way for an allergen to cross epithelial barriers obviously is by injection, as seen in type I reactions against injected penicillin and other drugs, and in allergic reactions to insect stings. In treating allergy, especially allergic asthma, the most important component is to identify the allergen and to help the patient to avoid it. If this is not done, the patient may be progressively sensitized to more and more allergens by the following pathophysiological mechanism. In addition to releasing histamine and chemokines, mast cells activated by cross-linked Fcε receptors promote class switch to IgE in nearby B cells, e. The patient, who used to produce IgG antibodies against most antigens, now progressively switches to IgE, meaning he becomes allergic to more and more antigens. A Rhesus-negative mother is immunized with Rhesus antigen during childbirth of her first Rhesus-positive child. Problems arise only if these waste management mechanisms are overburdened, leaving dangerous immune complexes to be deposited in "illegal dumps". As antibodies have at least two binding sites (IgM has more), and most antigens have many antigen-binding domains, higher order complexes may form, depending on relative molar concentrations. In the event of antibody or antigen excess, immune complexes tend to remain small and soluble, while in the zone of approximate equivalence, large three-dimensional lattices tend to form. Along these lines, two subtypes of immune complex diseases are differentiated: In diseases of the Arthus-reaction type, large complexes are formed that activate complement and phagocytes at the site of precipitation, leading to local tissue damage (Maurice Arthus was a French immunologist). Important diseases of this type are the various forms of extrinsic allergic alveolitis (hypersensitivity pneumonitis). If inhalation antigens enter the lungs in very high concentrations, the immune system tends to react by producing 58 IgG, not IgE. In the joints, large complexes form between rheumatoid factor and other IgG antibodies, contributing to inflammation and tissue destruction. They overwhelm the erythrocyte transport system and accumulate at sites of plasma filtration: kidney glomerula, linings of serous cavities, joints, arterioles in general.
You should be aware of whether the patient is syndromic or not (those with a “syndrome” typically have more sutures in need of repair cheap 20mg apcalis sx amex, and might well have other problems) buy 20 mg apcalis sx amex, and the extent of the repair. Because of the large blood loss, they typically receive quite a bit of fluid intra-operatively as well as post-operatively. Each member of the team brings unique knowledge and perspective to the care of the patient and recognizing and integrating all members of the team in the ongoing care of the patient is essential in providing optimal care for these patients. The presence of trainees from medicine, nursing, respiratory therapy, or other disciplines adds to the size and complexity of the team caring for the patient, and the roles and responsibilities of these individuals must be explicitly acknowledged. Perioperative care encompasses both pre and post operative care of the patient with congenital heart disease. Although many infants and children with congenital heart defects are managed as outpatients until their repairs, some infants or older children with severely abnormal physiology require stabilization and critical care prior to surgery. Many of the basic principles of cardiac intensive care apply to both pre and post operative care and will be considered in this chapter. In addition to supportive care and stabilization, pre operative management includes thorough evaluation of the anatomy and physiology of the heart and the physiologic status of the patient as a whole so that appropriately planned and timed surgery can take place. Basic principles of pediatric critical medical and nursing care remain relevant in the pediatric congenital cardiac patient. Pediatric cardiac patients are cared for in specialized cardiac intensive care units and in multidisciplinary intensive care units. There is some data that institutions that perform more surgeries have improved outcomes (info here—based on surgeon, unit, hospital?? Regardless of the focus of the unit, a commitment to ongoing education and training, as well as a collaborative and supportive environment is essential. We feel strongly that a unit dedicated to the care of infants and children is best able to care for these patients (down on the adult units caring for kids). Oxygen delivery is therefore primarily dependent on systemic cardiac output, - 58 - hemoglobin concentration, and oxygen saturation. Stroke volume is in turn dependent on preload, afterload, and myocardial contractility. Both pulmonary blood flow (Qp) and systemic blood flow (Qs) are determined by these fundamental forces. In the patient with two ventricles, ventricular interdependence, or the affect of one ventricle on the other, may play a role in pulmonary or systemic blood flow. In some situations, including the post operative state, the pericardium and restriction due to the pericardial space may also play a role in ventricular output. When evaluating the loading conditions of the heart and myocardial contractility, it is important to consider the two ventricles independently as well as their affect on one another. In previously healthy pediatric patients without heart disease, right atrial filling pressures are commonly assumed to reflect the loading conditions of the left as well as the right ventricle. Pre-existing lesions and the affects of surgery may affect the two ventricles differently. For example, the presence of a right ventricular outflow tract obstruction will lead to hypertrophy of the right ventricle. That right ventricle will be non-compliant, and the right atrial pressure may therefore not accurately reflect the adequacy of left ventricular filling. Oxygen content (CaO2) is primarily a function of hemoglobin concentration and arterial oxygen saturation. Thus, patients who are cyanotic can achieve adequate oxygen delivery by maintaining a high hemoglobin concentration. Arterial oxygen saturation is commonly affected by inspired oxygen content, by mixed venous oxygen content of blood, by pulmonary abnormalities, and by the presence of a R to L intracardiac shunt. Arterial oxygen content in the patient with a single ventricle and parallel pulmonary and systemic circulations will depend on the relative balance between the circulations as well. In the patient with intracardiac shunt or the single ventricle patient, arterial oxygen content is also affected by the relative resistances of the pulmonary and systemic circuits, as this determines how much blood flows through the lungs relative to the systemic output. Low mixed venous oxygen content contributes to desaturation and suggests increased oxygen extraction due to inadequate oxygen delivery, which in turn is either due to inadequate systemic cardiac output or inadequate hemoglobin concentration. A thorough understanding of these fundamental principles of cardiac output and oxygen delivery is essential for the perioperative care of the patient with congenital heart disease.
It is made of dense connective tissue with course of collagenous fiber bundles that crisscross to form a storma of elastic network buy apcalis sx 20mg on-line. In the reticular layer many blood and lymphatic vessels generic 20 mg apcalis sx with amex, nerves, fat cell, sebaceous (oil) glands and hair roots are embedded. Hypodermis is composed of loose, fibrous connective tissue, which is richly supplied with lymphatic and blood vessels and nerves. Protection: against harmful microorganisms, foreign material and it prevents excessive loss of body fluid. The color of blood reflected through the epidermis * The main function of melanin is to screen out excessive ultraviolet rays. The person 47 Human Anatomy and Physiology who is genetically unable to produce any melanin is an albino. Sudoriferous /sweat/ glands Types: Eccrine and Apocrine glands Eccrine glands are small, simple coiled tubular glands distributed over nearly the entire body, and they are absent over nail beds, margins of lips of vulva, tips of penis. The sweat they secret is colorless, aqueous fluid containing neutral fats, albumin, urea, lactic acid and sodium chloride. Apocrine glands are odiferous, found at the armpits, in the dark region around nipples, the outer lips of the vulva, and the anal and genital regions. The female breasts are apocrine glands that have 48 Human Anatomy and Physiology become adapted to secret and release milk instead of sweat. It functions as a permeability barrier, an emollient (skin softening) and a protective a gent against bacteria and fungi. Acne vulgaris is a condition when there is over secretion of sebum, which may enlarge the gland and plug the pore. It covers the entire body except the palms, soles, lips, tip of penis, inner lips of vulva and nipples. Hair consist epithelial cell arranged in three layers from the inside out medulla, cortex and cuticle. Part of the hair follicle is attached with the bundle of smooth muscle about halfway down the follicle. The fastest growth rate occurs over 51 Human Anatomy and Physiology the scalp of women aged 16 to 24 years. Nails are composed of flat, cornified plates on the dorsal surface of the distal segment of the fingers and toe. The proximal part of nail is lunula, which is white in its color because of the capillaries underneath are covered by thick epithelium. Skin gets its color from a) Carotene b) Underlying blood vessels c) Melanin d) a and b only e) a, b and c 54 Human Anatomy and Physiology 4. Sudoriferous glands secret their secretion in response to: a) Physiological process b) Heat c) Stress d) Sexual experience e) In all of the above condition 5. But from structural point of view, the human skeletal system consists of two main types of supportive connective tissue, bone and cartilage. Movement: skeletal muscles attached to the skeletal system use the bone to levers to move the body and its part. Short bones are about equal in length, width and thickness, which are shaped with regular orientation. Typical sesamoid bones are patella and pisiform carpal bone, which are in the tendon of quadriceps femuris and flexor carp ulnaris muscle respectively. Gross anatomy of a typical long bone You can take Tibia (in the leg) one of the longest bones in the body. The red marrow also known as myeloid tissue Endosteum is the lining the medullary cavity of compact bone tissue and covering the trabeculae of spongy bone tissue. It is more rigid than other tissues because it contains inorganic salts mainly calcium phosphate & calcium carbonate. Osteons are made up of concentric layers called lamellae, which are arranged seemingly in wider and wider drinking straws. In the center of the osteons are central canals (haversion canal) , which are longitudinal canals that contains blood vessels, nerves and lymphatic vessels.
Elderly are sensitive to the drugs like hypnotics apcalis sx 20mg low price, tranquilizers apcalis sx 20 mg without a prescription, phenylbutazone, diazepam, pethidine, etc. So a) Using age of the child the dose will be 3 x 10 = 3 x100 = 20mg 3+12 15 b) Using body weight of the child it will be 30 x 100 = 1 x 100 = 20mg 150 5 5. Disease state: Some antimicrobial agents penetrate the cerebrospinal fluid well across the normal meninges while other antimicrobials penetrate well only when the meninges are inflammed (meningitis) e. Acute or chronic liver diseases markedly modify the rate and extent of biotransformation of drugs. The t1/2 of chlordiazepoxide and diazepam in patients with liver cirrhosis is greatly increased with corresponding prolongation of their effects. Cardiac disease by limiting blood flow to the liver may impair disposition of those drugs whose biotransformation is flow limited e. Pharmacogenetics: The science pharmacogenetics is concerned with the genetically- mediated variations in drug responses. It is a phenomenon which occurs when the effects of one drug are modified by the prior or concurrent administration of another drug(s). A drug interaction may result in beneficial or harmful effects and may be classified into: a) Pharmaceutical drug interactions: Serious loss of potency can occur from incompatibility between an infusion fluid and a drug that is added to it. For example diazepam if added to infusion fluid there will be a precipitate formation → loss of therapeutic effect. If the drug A is metabolized by the microsomal enzymes, then concurrent administration with a microsomal inducer (drug B) will result in enhanced metabolism of drug A. Warfarin (anticoagulant) + Barbiturate (enzyme inducer) → decreased anticoagulation. Penicillin (antibiotic) + Probenecid (antigout drug) → Increases the duration of action of penicillin (Both drugs excreted through tubular secretion). Pharmacodynamic interactions: (i) Drug Synergism: When the therapeutic effect of two drugs are greater than the effect of individual drugs, it is said to be drug synergism. Trimethoprim+sulfamethoxazole 23 (iii) Drug Antagonism: The phenomenon of opposing actions of two drugs on the same physiological system is called drug antagonism. Competitive antagonism can be overcome by increasing the concentration of the agonist at the receptor site. Acetyl choline causes constriction where as adrenaline causes dilatation of pupil. Importance of drug antagonism (i) Correcting adverse effects of drugs (ii) Treating drug poisoning. Tachyphylaxis: Rapid development of tolerance on repeated administration is called tachyphylaxis e. Ephedrine, amphetamine and nitroglycerine which produce tachyphylaxis on repeated administration. Placebo: It is a Latin word meaning” I shall please” and it is a tablet looking exactly like the active treatment but containing no active component. It refers originally to substances merely to please the patient when no specific treatment was available. Adverse drug reactions: The drugs that produce useful therapeutic effect may also produce unwanted or toxic effects. If is always an exaggeration of its pharmacological actions and some times it is predictable. The adverse effects are 1)Side effects 2)untoward effects 3)allergic reactions 4)idiosyncratic reactions and 5)teratogenic effects. They are undesirable and if very severe, may necessitate the cessation of treatment. When an individual has been sensitized to an antigen (allergen) further contact with that antigen can some times lead to tissue damaging reactions. With the increasing knowledge of pharmacogenetics, many idiosyncratic reactions have been found to be genetically determined.
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