By I. Jensgar. Bienville University. 2018.
Outbreak of severe acute respiratory syndrome in Hong Kong Special Administrative Region: case report order actos 15 mg without prescription xanax blood glucose. Epidemiological determinants of spread of causal agent of severe acute respira- tory syndrome in Hong Kong discount actos 30 mg with mastercard diabetes prevention exercise and diet. This virus was similar to the influenza virus originating from birds that caused an outbreak in humans in Hong Kong in 1997, and new outbreaks of similar strains were expected. Investigations then focused on members of the Paramyxoviridae fam- ily, after paramyxovirus-like particles were found by electron micros- copy of respiratory samples from patients in Hong Kong and Frankfurt am Main. At about the same time, China reported the detection, by electron microscopy, of Chlamydia-like organisms in patients who had died from atypical pneumonia during the Guangdong outbreak. This announcement came after research done by the then 13 participating laboratories from ten countries had demonstrated that the novel coronavirus met all four of Koch’s postulates necessary to prove the causation of disease: 1. Proof of the last two requirements was provided after inoculation of cynomolgus macaques (Macaca fascicularis) with Vero-cell cultured Kamps and Hoffmann (eds. In immunocompetent hosts, infection elicits neutralizing antibodies and cell-mediated im- mune responses that kill infected cells. These coronaviruses can replicate in liver, lung, kidney, gut, spleen, brain, spinal cord, retina, and other tissues (Holmes). They can occasionally cause serious infec- tions of the lower respiratory tract in children and adults and necro- tizing enterocolitis in newborns (McIntosh, El-Sahly, Folz, Sizun). The known human coronaviruses are able to survive on environmental surfaces for up to 3 hours (Sizun). Coronaviruses may be transmitted from person-to-person by droplets, hand contamination, fomites, and small particle aerosols (Ijaz). Morphology Negative-stain transmission electron microscopy of patient samples and of cell culture supernatants reveals pleomorphic, enveloped coro- navirus-like particles with diameters of between 60 and 130 nm. Examination of infected cells by thin-section electron microscopy shows coronavirus-like particles within cytoplasmic membrane-bound vacuoles and the cisternae of the rough endoplasmic reticulum. In addition, the spike protein has been shown to be a virulence factor in many differ- ent coronaviruses. Finally, the S protein is the principal viral antigen that elicits neutralizing antibody on behalf of the host. It is the major determinant of virion morphogenesis, selecting S protein for incorporation into virions during viral assembly. There is evidence that suggests that the M protein also selects the genome for incorpora- tion into the virion. The stability seems to be higher in stools from pa- tients with diarrhea (the pH of which is higher than that of normal stool). In supernatants of infected cell cultures, there is only a minimal re- duction in the concentration of the virus after 21 days at 4°C and – 80°C. After 48 hours at room temperature, the concentration of the virus is reduced by one log only, indicating that the virus is more stable than the other known human coronaviruses under these conditions. Furthermore, the agent loses its infectivity after exposure to different commonly-used disinfectants and fixatives. They could there- fore have acquired the virus from a wild animal or from other animals during captivity or even from humans. Vaccines There are currently no commercial veterinary vaccines to prevent respiratory coronavirus infections, except for infectious bronchitis virus infections in chickens. The S protein is generally thought to be a good target for vaccines because it will elicit neutral- izing antibodies. It should be noted, however, that in experimental infections with human coronavi- rus 229E, infection did not provide long-lasting immunity. Likewise, several animal coronaviruses can cause re-infections, so lasting im- munity may be difficult to achieve. The rapid success of this approach results from a collaborative effort – rather than a competitive approach – by high-level laboratory investi- gators making use of all available techniques, from cell culture through electron microscopy (Hazelton and Gelderblom) to molecular techniques, in order to identify a novel agent.
The norm of occasional consumption entails an intermittent pattern of drug intake discount actos 15mg diabetes type 1 foods to eat, which depends on the emergence of situations that trigger consumption actos 45mg online diabetes type 1 brain damage. The first is socio- recreational, characterized by taking place in the context of enhancing recreational or social relations, such as weekend consumption. The second norm is circumstantial-situational, which is related to the objective of improving performance at work, at school, etc. In this pattern of consumption dependence and withdrawal symptoms are usually present when the drug is not consumed. Therefore, the habitual consumer is motivated by the need to reduce physical and psychological discomfort. Finally, the norm of compulsive consumption is that which occurs at a frequency of several times a day. The consumption renders the person incapable of coping with everyday problems, seriously affecting her/his work, family and social relationships. The consumer´s whole world is focused on maintaining a minimum level of substance that will help alleviate the symptoms of withdrawal. Barriga (1996) distinguishes between four types: a) Experimental: they live the consumption experience as a trial; driven by curiosity, they are mainly stimulated by the context in which they find themselves. The level and criteria for the severity of psychoactive substance dependence are as follow: − Mild: Few, if any, symptoms in excess of those required to make the diagnosis, and the symptoms result in no more than mild impairment in occupational functioning or in usual social activities or relationships with others. A central descriptive characteristic of the dependence syndrome is the desire (often overpowering) to take substances. A return to substance use after a period of abstinence leads to a more rapid 25 Basic Concepts in Drug Addiction reappearance of other features of the syndrome than occurs with nondependent individuals. We also explain the factors that modulate the initiation and maintenance of drug use according to the classification of individual, micro social and macro social factors. Individual Factors Biological Aspects 26 José Pedro Espada and Daniel Lloret Irles Among individual factors related to substance use, genetic variables stand out the most. The relationship between parental drug use and the initiation into substance use by children has generated much controversy over whether the intergenerational transmission of drug abuse is due to biochemical or genetic factors or, in addition to biological vulnerability, other more determinant risk factors that are psychosocial or environmental in character. Most data come from studies focused on alcohol consumption and very few studies have been done in relation to other types of drugs. Physiological/biochemical studies suggest that sensation seeking and low risk avoidance predict the early initiation of alcohol use and later development of addiction. Similarly, in the case of marijuana, poor impulse control during childhood appears to predict the frequent use of this substance at the age of 18 (Shedler and Block, 1990). Studies with families indicate that alcoholic subjects are usually more likely to have a previous history of alcoholism among parents or siblings. These kinds of studies present significant methodological difficulties that hamper the generalization of results and limit their conclusions. Nevertheless, from research with children of alcoholics it has been concluded that these children are a risk population. Another area in which the contribution of genetic factors to the development of alcoholism has been investigated is the analysis of twins. In this area, there was an outstanding study conducted by Kaij (1960) with 174 pairs of Swedish male twins who had been reared separately from birth. The results indicated that when at least one member of each pair of twins was a proven chronic alcoholic, the concordance values for alcoholism were high, 71. Despite the discrepancies in the studies conducted in this area and the need for more evidence to confirm the assumptions, the idea that monozygotic twins may have a higher probability of being concordant for the development of alcoholism than dizygotic twins appears to hold up. Among biological factors, two interesting aspects stand out because of their implication in prevention programs in terms of the adjustment and enhancement of substance use protective factors in the adolescent population. The first is the differential influence of gender in young people in substance use and the second is age as a risk factor for substance use. These data underscore the idea that there appears to be no genetic vulnerability determined by the sex which leads subjects to use or to abstain from substance consumption. The earlier drug consumption starts, the greater the frequency of use thereof (Alvira 1984; Basabe and Páez, 1992; Brook, Lukoff and Whiterman 1980, Fleming, Kellam and Brown, 1982; Rachal et al.
Systemic anatomy studies functional relationships of organs within a system whereas Regional anatomy studies body part regionally generic actos 30mg fast delivery diabetic diet 5 day plan. Both systemic and regional approaches may be used to study gross anatomy Microscopic anatomy (Histology) requires the use of microscope to study tissues that form the various organs of the body proven 15mg actos diabetes mellitus type 2 code. Homeostasis When structure and function are coordinated the body achieves a relative stability of its internal environment called homeostasis / staying the same. Although the external environmental changes constantly, the internal environment of a healthy body remains the same with in normal limits. Under normal conditions, homeostasis is maintained by adaptive mechanisms ranging from control center in the brain to chemical substances called hormones that are secreted by various organs directly into the blood streams. Some of the functions controlled by homeostasis mechanisms are blood pressure, body temperature, breathing and heart rate. The most common elements in living organism are carbon, hydrogen, oxygen, nitrogen phosphorus and sulfur. Epithelial tissue: - Found in the outer layer of skin, lining of organs, blood and lymph vessels and body cavities. Organ: - Is an integrated collection of two or more kinds of tissue that works together to perform specific function. For example: Stomach is made of all type of tissues 6 Human Anatomy and Physiology System: Is a group of organs that work together to perform major function. But once you have understood the basic word roots, combining word forms, prefixes and suffix you will find that anatomical terminologies are not as difficult as you first imagined. Anatomical positions are universally accepted as the starting points for positional references to the body. In anatomical position the subject is standing erect and facing the observer, the feet are together, and the arms are hanging at the sides with the palms facing forward. Relative means the location of one part of the body is always described in relation to another part of the body. Body parts Regions The body can generally be described to have areas of: Axial body part: - It is the part of the body near the axis of the body. It is customary to subdivide the abdominal area into nine regions or more easily in to four quadrants. The two main body cavities are the larger ventral (anterior) and the smaller, dorsal (posterior) body cavity. It consists of the right and left pleural cavities and mediastinum (the portion of tissues and organs that separates the left and right lung). It is divided into superior abdominal and inferior pelvic cavity by imaginary line passing at upper pelvis. The anatomical term opposite to lateral is: - a) Proximal b) Distal c) Medial d) Superficial e) Caudal. This phenomenon is called: a) Anatomical integrity b) Physiological stablity c) Homeostasis d) Hemostasis e) Body stasis 3. A plane that divided the body into anterior and posterior parts is: - a) Medial plane b) Coronal or frontal plane c) Sagital plane d) Transverse plane e) Oblique plane 5. Cytology: - It is a branch of science concerned with a study of cells Cell Theory explains about a) All living organisms are composed of cell and cell products. To know more about cell, we can divide the cell in to four principal parts: - Plasma (cell) membrane: it is the outer lining, limiting membrane separating the cell internal parts from extra cellular materials & external environment. Cytoplasm: cytoplasm is the substance that surrounds organelles and is located between the nucleus and plasma membrane 17 Human Anatomy and Physiology Organelles: these are permanent structures with characteristic morphology that are highly specialized in specific cellular activity. Extra cellular materials are also referred to as the matrix, which are substances external to the cell surface. The quality selective permeability Movement across-cell membrane Movements a cross membrane takes place in two ways. Simple diffusion, the random movements of molecules from area of high concentration to the area of low concentration. Facilitated diffusion, larger molecules, which are not soluble in lipid need protein channel to pass through the plasma membrane.
Stomal level · Principle factors include a stoma that is too large buy actos 15 mg visa diabetes type 1 natural cure, loss of tissue from infection (rare) generic actos 30mg visa diabetes type 1 cure news, and pressure erosion from rigid connecting systems (most common) · Avoid injuring the first cartilaginous ring during original tracheostomy to prevent subglottic stenosis · Avoid low placement of the tracheostomy to prevent innominate artery erosion and supracarinal stenosis C. Sealing cuff level · Most common cause is direct pressure necrosis by high-pressure cuff · This has essentially disappeared with use of low-pressure, high-volume cuffs · Children may develop granuloma on anterior tracheal wall when ventilated without a cuff D. Tracheomalacia · Usually occurs in segment of trachea between stoma and the cuff · Secretions pool here and inflammation leads to cartilage thinning E. Tracheoesophageal fistula · Manifested by sudden appearance of secretions in tracheobronchial tree · Pneumonitis, pneumonia, abscess, and gastric dilitation may develop · Methylene blue in tube feedings will appear promptly in the trachea F. Lower half of trachea · Posterolateral thoracotomy in 4th interspace provides optimal exposure and should be performed on the side contralateral to the aortic arch (usually right) · About 4. Tracheal allograft reconstruction: the total North American and worldwide pediatric experiences. Reoperative tracheal resection and reconstruction for unsuccessful repair of postintubation stenosis. Management of congenital tracheal stenosis by means of slide tracheoplasty or resection and reconstruction, with long-term follow-up of growth after slide tracheoplasty. Esophageal atresia and tracheoesophageal fistula: surgical experience over two decades. Sources for further reading Textbook Chapters Chapter 12: Congenital Lesions, Neoplasms, and Injuries of the Trachea. Chapter 38: The Trachea: Tracheostomy, Tumors, Strictures, Tracheomalacia, and Tracheal Resection and Reconstruction. Neonatal stage · Precursors of typical acinar unit are present at birth: bronchioles, transitional ducts, and terminal saccule · Alveolar development continues after birth with remodeling and multiplication · The total adult number of alveoli are not reached until at least age 8 · Alveolar enlargement continues until adulthood, although no new alveoli are added C. Agenesis and Aplasia · Agenesis = complete absence of carina, main bronchus, lung, and pulmonary vasculature · Aplasia = development of carina and rudimentary main bronchus; absence of lung and pulmonary vessels · Bilateral pulmonary agenesis extremely rare and uniformly fatal · More than 50% of patients with unilateral agenesis have other associated anomalies · Agenesis does not show a right or left predominance · Lobar agenesis is less common that total lung agenesis B. The composition of the cyst wall is determined by its origin: bronchial glands, cartilage, or alveolar epithelium. Pathology · Congenital cysts are typically unilocular and confined to a single lobe; the lower lobes are more commonly involved · Congenital cysts that persist for more than 1 year are unlikely to resolve spontaneously · Multiple cysts are rarely congenital and are probably acquired; causes include staphylococcal pneumonia and cystic fibrosis. Symptoms · Expansion results in respiratory distress · Infection causes fever, cough, and sepsis C. Symptoms · Progressive respiratory distress in a newborn infant · Tachypnea, subcostal retraction, cyanosis · Older child - chronic pulmonary infection · Differential should include congenital diaphragmatic hernia, and barium swallow will differentiate the two C. Pathology · Cysts can occur either in the parenchyma (70%) or the mediastinum (30%) · The most common locations are paratracheal, carinal, hilar, and paraesophageal · Generally round and unilocular · Lined with ciliated columnar epithelium · Most do not communicate with the tracheobronchial tree · Can mimic lobar emphysema from bronchial obstruction · Can become secondarily infected B. Pathology · Unicystic or polycystic parenchyma with extensive fibrosis and vascular sclerosis · Arterial supply is usually from the thoracic aorta (75%) or abdominal aorta (20%) · Venous drainage is usually to the pulmonary veins · Right-sided lesions more often have other venous drainage · Much more frequent than extralobar type B. Treatment · Identification of the lesion is indication for surgery · Careful ligation of the anomalous artery followed by resection · Prevents long-term infection and possible neoplastic changes Extraobar Pulmonary Sequestration Definition: segment of lung parenchyma with distinct and separate pleural investment; does not communicate with the tracheobronchial tree and is supplied by the systemic circulation. Pathology · Mass of loose, spongy parenchyma with multiple small cysts and dilated bronchioles and ducts · Arterial supply is also usually from the thoracic or abdominal aorta · Venous drainage is usually to the azygous or hemiazygous system · More common on the left side and usually found between the lower lobe and the diaphragm B. Evrard V, Ceulemans J, Coosemans W, De Baere T, De Leyn P, Deneffe G, Devlieger H, De Boeck C, Van Raemdonck D, Lerut T. Cioffi U, Bonavina L, De Simone M, Santambrogio L, Pavoni G, Testori A, Peracchia A. Presentation and surgical management of bronchogenic and esophageal duplication cysts in adults. Sources for further reading Textbook Chapters Chapter 24: Congenital Lesions of the Lung and Emphysema. Chapter 13: Developmental Abnormalities of the Airways and Lungs: Thoracic Surgery in Childhood. Characteristics Definition confused by overlap in etiology and symptomatology among emphysema asthma chronic bronchitis 2/3 of adults show some emphysema at autopsy 10% have severe clinical disease 10% of cigarette smokers have significant chronic airflow obstruction associated with chronic bronchitis 3. Pathogenesis Earlier studies: Infective, degenerative, obstructive mechanical factors Present studies: Enzymatic mechanisms of tissue destruction Protease pathogenesis hypothesis Destruction of the interstitium is due to an excess of proteolytic enzymes (elastase) in relation to the availability of proteolytic inhibitors Heritable alpha -1 anti-trypsin deficiency Animal studies with elastolytic proteolases 4.