Megan Elizabeth Bowles Clowse, MD

• Associate Professor of Medicine

https://medicine.duke.edu/faculty/megan-elizabeth-bowles-clowse-md

However 86 treatment ideas practical strategies buy kemadrin 5 mg on-line, there has been only limited human clinical and animal toxicology studies in this regard medications causing gout cheap kemadrin 5 mg without prescription. Direct damage to the airway resulting in epithelial denudation medicine 44291 kemadrin 5 mg order, exposure of sensory nerves symptoms of depression order 5 mg kemadrin with mastercard, and exaggerated reflex bronchoconstriction upon stimulation treatment croup generic kemadrin 5 mg with visa, coupled with a loss of barrier function and of epithelium-derived relaxing factor or other mediators, is also a potential scenario. Bisulfite may act by altering acetylcholine receptors via sulfonation of disulfide bonds, thus modulating the contraction of smooth muscle. Human bronchial epithelial cells exposed in vitro to sodium bisulfite and sodium sulfite resulted in elevation of specific proteins expressed by genes involved in the inflammatory response (Reno et al. Neurogenic inflammation is a basis for an acute inflammatory response in many tissues, as well as a primary mechanism of toxicity for a number of irritant chemicals. A change in the thickness of the mucus blanket due to such hypersecretion, hyperplasia of secretory cells, or differentiation of ciliated cells into mucus-secreting cells could result in changes in mucociliary clearance function. The responses to acidic sulfate particles likely result from the deposition of Hþ on airway surfaces. Examination of diverse biological endpoints, including mucociliary transport, alveolar clearance, pulmonary function, and production of biological mediators, has shown that the relative potency of acidic sulfate aerosols is related to their degree of acidity, that is, the Hþ content of the exposure environment (Schlesinger, 1984, 1989). Because the hydrogen ion is likely responsible for the toxicity of acid sulfates, the mode of inhalation will affect the potential for biological response. For the same mass (ionic) concentration of acidic sulfates in an exposure atmosphere, oral inhalation will result in more neutralization compared with nasal inhalation and, therefore, less Hþ available for deposition within the lower respiratory tract. In fact, the extent of neutralization of inhaled acid sulfates has been shown to modulate toxic effects. Acid sulfate-induced airway hyperresponsiveness may involve an increased sensitivity to mediators involved in control of airway smooth muscle tone. Since some eicosanoids are involved in the regulation of smooth muscle tone, this imbalance may also be involved in the development of airway hyperresponsiveness. For example, incubation of rabbit tracheal explants in acidic media reduced the production of prostaglandin E2, an epithelium-derived mediator associated with bronchodilation, and the inhibition of agonist-induced smooth muscle contraction. Modulation of pulmonary pharmacological receptors may underlie some sulfur oxide-induced responses. In terms of airway hyperresponsiveness, this could involve interference with normal contractile/dilatory processes in the airways, via modulation of receptors involved in maintenance of muscle tone. Any acid-induced enhanced downregulation, by affecting production of reactive oxygen species by macrophages, may create an environment conducive to secondary pulmonary insult, such as bacterial infections, especially in susceptible populations. In addition, alterations in mediator release due to receptor downregulation may, in turn, influence airway responsiveness. This may subsequently enhance penetration of inhaled antigens, present in most ambient atmospheres, to submucosal cells involved in allergic reactions. Sulfate particles have been associated with permeability alterations (Kleinman, 1995). One of the more studied responses to acid sulfates is change in tracheobronchial mucociliary transport. At alkaline pH, mucus is more fluid than at acidic pH, so a small increase in viscosity due to deposited acid could "stiffen" the mucus blanket, altering the efficiency with which it is coupled to the beating cilia (Holma et al. A small increase in mucus production could facilitate clearance, whereas more excessive production could result in a thickened mucus layer, which would be ineffectively coupled to the cilia. Chronic exposure of animals to sulfuric acid increases the number of airway secretory cells, especially in small airways where these cells are normally absent or are few in number. Furthermore, this increase has been associated with a change in the glycoprotein composition of the mucus, suggesting increased viscosity. The result of any increase in cells could be an increase in secretory rate or volume. While mucus hypersecretion is a hallmark of chronic bronchitis, epidemiological studies are not clear as to its importance in the development of chronic pulmonary disease related to air pollution (Bates, 1983; Peto et al. An effect of acidic sulfate exposure that may be related to a number of physiological alterations involves changes in cellular pH. Intracellular pH is one of the major determinants of the rate of many cellular functions, and has been linked to the control of vital cellular processes. Deposited acid may also affect the internal pH of epithelial cells and other functions of these cells. Effects with longer term exposures are more equivocal, but adverse health outcomes appear to be absent at levels below about 0. Furthermore, there appears to be a wide range in susceptibility among normal and potentially susceptible populations. Asthmatics, especially asthmatic children, do appear to respond at lower concentrations, although there is very wide variability in sensitivity. However, severe asthmatics, who would potentially be the most susceptible, are not included in controlled exposure studies. Controlled studies with sulfate particles have shown that there are no significant biological responses at ambient concentrations, and epidemiological studies are inconsistent in their outcomes related to sulfates (Reiss et al. In Monograph for Occupational Exposures to Mists and Vapors From Strong Inorganic Acids and Other Industrial Chemicals (Vol. Comparative Biochemistry and Physiology Part C: Pharmacology, Toxicology and Endocrinology, 114, 89­98. Report on air quality in nonattainment areas for 2003­2005 covering ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide and lead. For example, the neurotoxic risk of lead is well recognized; exposure occurs via inhalation, ingestion, and hand-to-mouth contact. Such systemic health effect risks will not be addressed in this article because the theme of this volume of Comprehensive Toxicology is the "toxicology of the respiratory system. This article is not an in-depth examination of individual metals, nor is it intended to catalog all human respiratory diseases associated with all airborne metal exposures. Virtually all metals have the potential for inhalation exposure, and many of them can cause portal-of-entry effects. To be concise, this review had to focus on metals that are of occupational and environmental importance. Jahaira Vera and Clark Lantz updated the text, Tables and references to this entire article. The entire list contains 30 compounds, called "30 urban Hazardous Air Pollutants" which are thought to pose the greatest air toxic urban risks. Several of the metals discussed (Cr, Mn) are essential for sustaining normal physiological function. Children can also accumulate higher levels of Mn and eliminate less Mn than adults. These relationships are complicated by the metal species, the dose, and the route of exposure, illustrating the importance of understanding all of these elements to assess risk. Understanding risks of metals requires an integration of information across the entire risk paradigm, including sources and emissions, air quality, exposure (the contact of a person with the metal over a particular duration of time), dose (the dose retained in the respiratory tract), and effects (noncancer and cancer). This article begins with an overview of fundamental factors that can have a significant influence on risk. Although they are presented separately here, they will be discussed more specifically in each of the risk paradigm sections. Even so, due to sparsity of the database, regulatory standards or guidelines typically focus on metal "compounds," Cr being a major exception. For example, in the environment, Cr predominantly exists in two valence states, each producing different effects. Briefly, the trivalent form is considered to be less toxic because it does not cross biological membranes as efficiently as does the hexavalent form. Also, hexavalent Cr has a higher redox potential, which enables it to be rapidly reduced to the trivalent form, and is involved in oxidative cycling that creates reactive oxygen radical species, which contribute significantly to toxicity. Nevertheless, there are still major uncertainties regarding the effects of these Cr compounds. This interaction between the kinetics and the oxidative states for metals like Cr has significant toxicological consequences. Similarly, the oxidative state and the degree of methylation can also affect arsenic toxicity. In contrast, some metals will elicit similar responses, regardless of their form, even though the potency may differ. However, many members of the population have risk factors that may increase susceptibility. Genetic differences may influence metabolism of the metal once it enters the body. For example, alterations in arsenic metabolizing genes have been associated with some arsenic related diseases (Banerjee and Giri, 2016), although references on polymorphisms related to the respiratory track of the metals of interest here could not be found. Some populations are likely to have a greater sensitivity to a given dose because their lungs are already compromised, increasing the impacts of added effects. The developing respiratory tract can be more sensitive than exposures during adulthood (Smith et al. For example, a metal may enter the air and be deposited on soil or water, thus entering the food chain. This metal could also be inhaled from the air as part of the original air emission, re-entrainment of deposited material, or a combustion process related to disposal of materials containing the metal. Thus, humans could encounter multiple pathways of exposure, ultimately resulting in total dose to target organ(s). Human exposure to metals occurs through all three environmental routesdoral, dermal, and inhalation. While inhalation is the route of interest for respiratory effects, the lung can also be a target of ingested metals as well. Sometimes the inhalation route is dismissed because only a relatively small fraction enters the body via this route. For Cd, the inhalation route is more toxic than the oral route (Oberdorster et al. Although far more Cd enters the body orally, absorption is roughly 5% compared to about 90% through the lungs. For lung cancer, about 1 m mÀ 3 inhaled over 24 h is equivalent to 1000 mg ingested daily. When these and related calculations are extended to risk estimates, Oberdorster estimates that for the same inhaled dose, there would be a similar risk for renal effects and lung cancer. For the same ingested dose, it is predicted that the risk for renal toxicity is 103­104 times higher than for lung cancer. Furthermore, Cd, Cr, and Ni are considered to be carcinogenic via the inhalation route, but not via the oral route (Ennever, 1994). This is based on the observation of an increased rate of lung but not other forms of cancer in workers and experimental animals exposed via inhalation but no increase in rate in animals exposed orally to these metals. Some metals may have very different toxicokinetic and toxicological properties via oral and inhalation routes. Very few studies of the mixtures containing metals with other compounds have been undertaken. One major study has examined the effects of welding fumes, which may contain As, Cd, Cr, Pb, Mn, Ni, zinc (Zn), and other metals. Such a complex composition makes determining the cause of adverse effects associated with any specific metal difficult. The fumes refer to the solid metal suspended in air, which form when vaporized metal condenses into very small particles. The vaporized metal gets oxidized when it comes into contact with the oxygen in the air, so the components of the fumes are oxides of metals. It has been estimated that welding processes can generate fume concentrations in the range of 100­400 mg mÀ 3 (Ulfarson, 1981). Typical breathing zone concentrations for workers have been measured in the range of 1­5 mg mÀ 3, depending on the welding processes and materials used. The condition is a self-limited, flu-like illness characterized by an acute onset within 4­8 h; symptoms may include thirst, dry cough, chills, fever, dyspnea, malaise, headache, and nausea. The illness is most often caused by inhaling welding fumes that contain zinc oxide generated during the joining of galvanized zinc-coated steel, and can last for 24­48 h. The development of a short-term tolerance to metal fume fever has been observed in welders in that they are asymptomatic during repeated exposures, but develop fume fever upon initial exposure after weekend breaks and work vacations (Martin et al. Welding may be associated with a longitudinal decline in lung function particularly associated with smoking (Szram et al. The association between welding fume inhalation and lung cancer development has been extensively studied over the past 25 years. In surveys of full-time welders, a significant increase in the prevalence of bronchitis is the most frequent chronic complaint associated with respiratory health (Sferlazza and Beckett, 1991). Some investigators have indicated that the inhalation of welding fumes may possibly induce asthma (Beach et al. A second example of determination of the toxic metals in mixtures is identification of constituents responsible for pulmonary toxicity of fugitive combustion emission particles (Dreher et al. Soluble leachates from residual oil fly ash were shown to cause acute lung injury. Soluble Ni from the fly ash was also shown to alter host defense function (Roberts et al. For example, if there are multiple pathways, a risk assessment that focuses on only one of them is unlikely to be useful in protective policy decisions. Knowing sources also provides clues to identifying potential populations at risk and identifying mitigation options. Sources emit metals, and these can be further transformed (most prominently in the water or food chain) to ultimately decrease air quality. Air quality is of obvious importance, but knowledge of how many people (with sensitivity characteristics) encounter poor air quality is the core of an exposure assessment.

This issue can be particularly acute just downwind from mine tailings and smelter sites symptoms during pregnancy proven 5 mg kemadrin, where dusts can contain high levels of metal(loid)s treatment yeast infection men 5 mg kemadrin buy, including arsenic with adverse health outcomes following inhalation exposures (Martin et al treatment vitiligo buy 5 mg kemadrin with mastercard. The relative levels of metals in aerosols from mining operations depend on the aerodynamic diameter (Gonzales et al medicine 44390 cheap kemadrin 5 mg on line. For example medicine reactions kemadrin 5 mg otc, samples collected at an active mining and smelting site showed the highest levels of arsenic, lead, and cadmium in the fine particulate (0. Studies have not been performed to evaluate effects of exposure to these complex metal mixtures. Some of these sources result in contamination of water, soil, and food, in addition to that of air. For example, people living in an area near an industrial source may be exposed to higher concentrations than is the general population. There can be a long-range transport of metals in air, thus increasing the number of people that may be exposed. In the atmosphere, certain metal particles could also undergo a chemical transformation that can result in either a more or less toxic compound. Average and maximum ambient air levels, as well as the average and maximum population exposures (modeling for movement and time spent in areas of differing exposure levels) are given. The maximum concentrations are considerably higherdsome attain microgram per cubic meter levels. Typical National Ambient Air Concentrations for rural, urban, and industrial settings are given in Table 2. As can be seen, levels of exposure around industrial sites can greatly exceed ambient levels (see arsenic for example). Levels for producing increased cancer risks of one in one million are also exceeded. These values are not absolute; they are intended to represent typical concentrations found in urban environments. A RfC is an estimate of a continuous inhalation exposure concentration to people (including sensitive subgroups) that is likely to be without risk of deleterious effects during a lifetime. A worker producing stainless steel alloys would have a different exposure potential than a worker soldering with stainless steel. One of the greatest factors is whether the operation adheres to the rules and whether the worker has adequate personal protective equipment available and uses it. If the respiratory tract is the primary target, the site of deposition and the extent of retention become important. If there is an extrapulmonary target site, clearance and translocation take on added importance. Much of the information in this section on the various factors involving deposition, retention, and clearance of particles in laboratory animals Toxicity of Airborne Metals 421 and in humans is derived primarily from Gardner (2006) and is also discussed in other reviews (Schlesinger, 1985, Schlesinger et al. Deposition includes the processes responsible for removing particles from the airstream, while clearance involves the rates and routes by which deposited particles are removed from the respiratory tract. Retention of metal particles at specific locations within the body reflects the net difference between deposition and clearance processes. The retained dose changes over time as a function of the exposure concentration and the duration of exposure. Particle dissolution rate and chemical composition are important physicochemical properties for the toxicity of metals. The transport of metal particles entrained in inhaled air is governed by laws of physics. The most important mechanisms for removing particles from the airstream are inertial impaction, sedimentation, and Brownian diffusion. Sedimentation refers to the settling out of particles from the airstream due to gravitational forces, while inertial impaction comes into play if a particle cannot follow changes in the direction of the airstream. Constant bombardment of metal particles by air molecules (diffusion) imparts random displacement motion and can result in the particles coming into close proximity of airway surfaces where they can intercept the airway walls and be deposited. Electrostatic attraction enhances deposition and can be an important deposition mechanism for some metal particles in certain workplace exposure settings if the workers are in close proximity to where the particles are being generated. However, for ambient exposures, electrostatic attraction is not an important deposition mechanism due to the time available for the metal aerosol essentially to become neutrally charged. The major determinants of the relative importance of the above deposition mechanisms are the geometric and aerodynamic equivalent particulate diameters. The size, shape, and density of a particle are incorporated into the aerodynamic diameter (dae), which is defined as the diameter of a unit-density. Since particles differing in size and density can have the same dae, they can deposit in the same sites within the respiratory tract. The mechanisms that are operative for clearance and translocation differ among the head, conducting airways, and alveolar regions (Table 3). Mechanical transport of intact particles is involved with most clearance mechanisms, with dissolution being the only absorptive process. Particles are classified categorically ranging from highly soluble to poorly soluble or insoluble, using data on the rate of dissolution of the particles compared to their rate of clearance by mechanical transport. A discussion of dissolution kinetics can be found in Smyth (2011) and Kuempel et al. Poorly soluble particles that deposit on nasal olfactory epithelium can have an extended time for bioavailability. Subsequent uptake by olfactory cells can result in retrograde neuronal transport to the brain, as has been shown for Cd (Sunderman, 2001) and Mn (Aschner et al. For nonhygroscopic and relatively insoluble metal particles, clearance via the mucociliary escalator occurs for particles deposited in the conducting airways. Some areas within airway bifurcations have regions of nonciliated cells, leading to prolonged retention in these regions; interestingly, these regions have been shown to be hot spots for particle deposition due to enhanced impaction losses at these sites during inspiration (Lippmann and Schlesinger, 1984). Another potential mechanism for clearance of particles deposited in conducting airways is through phagocytosis by macrophages resident there (Gehr et al. Clearance of insoluble particles in the alveolar region is typically on the order of months to years (Gardner, 2006) Clearance from the alveolar region can occur through phagocytosis of deposited particles by macrophages located either in the airway lumen or in the interstitium, with eventual removal via either the mucociliary escalator or transfer to the lymphatics. Uningested interstitial particles have been shown to be able to pass through the capillary endothelium and directly enter the bloodstream (Raabe and Witschi, 1982). Which mechanisms and pathways are operative depends upon exposure rate and concentration, particle size, particle number, and current mass loading of particles. While the same pathways for clearance of particles can be found in both laboratory animals and humans, their relative importance varies considerably among species (Phalen and Mendez, 2009). Dissolution of deposited metal particles can be a significant factor in their ultimate fate and toxicity. Highly soluble forms are rapidly dissolved in the mucous and surfactant layers that line the respiratory tract. They can then rapidly diffuse into the epithelium and be absorbed into the bloodstream so they can be transported to various extrapulmonary sites. Less soluble metal particles may be retained in the lung for longer periods of time, potentially producing local effects at the sites of deposition and a variety of chronic lung diseases, or may be slowly absorbed into the blood in a "timed-release" fashion. Insoluble particles may ultimately be removed from the lung by various clearance mechanisms. There may also be morphometric differences in alveolar parameters that influence the choice of dose metrics for specific types of effects. The following factors impact dosimetry: InhalabilitydAlthough rodents are obligatory nose breathers, humans can inhale particles from the surrounding air space through either nose or mouth. Inhalability can be defined as the probability that a particle of a given size will enter the nose or mouth of humans or the nose of animals. One can use this probability to adjust the concentration of particles external to the human or animal to obtain the concentration of particles in the inspired air. Inhalability varies among species (Phalen and Mendez, 2009), so adjustments must be made when making interspecies comparisons of exposure scenarios leading to the same internally deposited dose. Inhalability decreases with increasing particle size, such that 85%, 77%, 70%, and 65% of 2, 3, 4, and 5 mm dae particles, respectively, are inhaled by laboratory rodents, but all of these sizes are 100% inhalable by humans. As minute ventilation increases beyond the oronasal switching point, the proportion of inhaled air entering via the mouth also increases. Since oronasal breathing modifies the amount and the pattern of particle deposition, activity patterns of the humans of interest need to be taken into account when assessing metal exposure levels that yield specific internal doses. Deposition equations and regional respiratory tract deposition curves incorporating the influence of Oronasal breathing are available (Miller et al. Anywhere from 7 to 32 branchings are needed to reach the terminal bronchioles in rat lungs, while the comparable number of branchings in the human lungs varies between 9 and 22 (Yeh and Harkema, 1993). This variability means that the inhaled substance is delivered sooner to some ventilatory units compared to others, resulting in heterogeneity in alveolar deposition. Variability among acini in particle deposition is large when particles are relatively small (0. For particles in the range of 1­3 mm dae, some acini receive about 50% more particles than do most acini. This enhances the probability that some areas of the lung may be affected, despite the overall appearance that the lung is normal. The human lung has several generations of respiratory bronchioles, which are alveolar region airways with only partial outpocketing l Toxicity of Airborne Metals 423 of alveoli in the walls. Thus, effects reported in the bronchiolar­alveolar duct junction in rats correspond to what might be expected in to be seen in human respiratory bronchioles. Since impaction is the major mechanism for head deposition, an impaction parameter incorporating the airflow rate and the dae is typically used to describe head deposition. Basically, however, head deposition for both adult humans and laboratory animals is slight. For humans, average peak particle deposition of 40%­50% in the conducting airways is associated with particles about 4­5 mm dae, with the peak being larger for oronasal compared to that for nasal breathing. In humans, there is only a modest deposition of a few percent in the conducting airways for particles < 1mm dae. For particles > 1 mm dae, there is enhanced alveolar deposition when adults breathe through the mouth as compared to the nose; below 1 mm dae, the two routes of breathing yield similar alveolar deposition efficiencies of about 10%­20%, with the minimum for deposition occurring at about 0. In laboratory rodents, there is significant variability in deposition for particles between 0. Only limited data are available regarding the deposition of particles in children (Becquemin et al. Thus, dosimetry models have primarily been employed to examine particle deposition in children. In addition, computational fluid dynamics simulations allow quantification of local deposition patterns and an in-depth examination of aerosol behavior. With the combination of both in vitro and in silico models, deposition in children can realistically be measured for future exposure studies (Carrigy et al. To date, human studies have only reported total respiratory tract deposition of ultrafines. Total respiratory tract deposition increases from about 30% to 90% as particle size decreases from 0. Recently, Asgharian and Price (2007) developed a dosimetry model that can be used to examine the regional deposition of ultrafine particles in the lungs of humans. In studying the health consequences of inhaled metals, epidemiological, animal inhalation toxicology, and in vitro methods have been used. This section will illustrate that exposure to a variety of airborne metals can result in a well-documented range of respiratory effects in humans and animals. We will focus on the effects of exposure to arsenic as an example of adverse health outcomes following inhalation of metal(oid)s. The lung is also a target organ for ingested arsenic, so we will highlight adverse respiratory outcomes following ingestion as an indication of alterations that may occur following inhalation. The interpretation of such worker studies is complicated because of the possibility of exposure to other contaminants in the working environment, including various gases and other heavy metal contaminants, which may also play a role in causing similar responses. In addition, inhaled metals are often associated with particulate matter which by itself can cause pulmonary pathological effects. Workers often complain of irritation of the nose and throat, which may lead to laryngitis, bronchitis, or rhinitis. It is not always known whether respiratory effects following the inhalation of metals are a direct effect of the specific metal on 424 Toxicity of Airborne Metals respiratory tissues, the general effects of having a foreign material in the lungs, or an effect of the metal on the pulmonary vasculature, possibly resulting in inflammation. Long-term exposure to certain metals can result in high retention in lung tissue, leading to pneumoconiosis with obstructive lung disease. Table 4 provides examples of the types of noncancer effects associated with exposure to airborne metals. Information on the health effects in animals following inhalation exposure to metals supports the finding in humans that the respiratory tract is a target. Because often there is a large amount of metals associated with airborne particulate matter during chronic inhalation, there is often a proliferation of macrophages observed in rats. This increase in the number of alveolar macrophages may contribute to the development of fibrosis. Hyperplasia of the reticuloendothelial cells in the peribronchiolar lymph nodes was observed in rats chronically exposed to airborne metals. This effect is probably the result of the clearance of particles from the lungs, and thus is an effect that likely occurs in humans. The proliferation of macrophages is a normal physiological response to the deposition of insoluble particles in the lung. However, excessive phagocytic activity prompted by extensive or repeated deposition of particles in the lung probably contributes to the development of fibrosis. More severe respiratory effects have also been reported in animals chronically exposed to metals. This suggests that it is possibly not the metal per se that causes the response, but more likely the particulate matter itself. This has been demonstrated by comparing the pulmonary responses to inhalation of dust that does not contain any metals with inhalation of the same dusts containing arsenicals.

Correlations have been found between respiratory health effects symptoms pinched nerve neck buy generic kemadrin on line, such as peak expiratory flow or asthma medication use medications xyzal cheap kemadrin 5 mg mastercard, and the ambient concentrations of both fine (d < 2 treatment urinary incontinence buy discount kemadrin online. Correlations are also found between ambient ultrafines and cardiovascular effects medications kidney stones purchase discount kemadrin on line, especially in the elderly (Utell and Frampton treatment yeast infection generic 5 mg kemadrin, 2000), and particle translocation from the airway to the vascular and neural systems may be a factor (Peters et al. Assessments of traditional (pre-2007 emission standards) diesel engines suggested that diesel exhaust is a carcinogen (Ris, 2007; Wichmann, 2007). Living near major highways has been associated with elevated risk for development of asthma and reduced lung function in children (Brugge et al. A study of lung function found that decreased peak expiratory flow rate correlated with 0. Isolating the effects of nanosized ultrafine particles through epidemiology is difficult due to simultaneous exposures to multiple pollutants. The development of an ultrafine particle concentrator (Sioutas and Koutrakis, 1996) has allowed exposure of humans and animals to real-world ultrafine particles at 10-fold or more above ambient concentration. A study of healthy and asthmatic volunteers with Los Angeles ultrafine particulate showed some small but equivocal deleterious cardiopulmonary responses independent of the gas-phase pollutants (Gong et al. A study using the combined concentrated fine and ultrafine fractions in Fresno showed mild, but significant, cellular effects in healthy adult rats (Smith et al. Many nanomaterial-based pharmaceutical formulations are in early research stages that emphasize proof-of-concept rather than clinical safety. The toxicity of rapidly dissolved particles is likely to be similar to the effects of the soluble components, but lowsolubility particles may present different issues due to long-term retention and biological interaction with the solid surface. Inhalable insulin (Exubera) as a solid particulate dosage form was withdrawn from the market. An unexpected side effect of the drug was a small and reversible reduction in forced expiratory volume (Cefalu et al. Occupational studies of airborne dusts historically measured mass concentration of particles that were below a specified cutoff aerodynamic size, and the effects of coarse, fine, and nanosized particles were not studied individually. Comparison of fine and ultrafine carbon black has suggested size-dependent differences in potency (Li et al. Exposure to high concentrations of carbon black produces lung tumors in rats, but not in mice or hamsters (Elder et al. Human exposure to carbon black is associated with increased risk of chest radiographic abnormalities, which may be reversible after reduction or cessation of exposure (Gardiner et al. Epidemiological studies among workers in carbon black production and in the rubber industry have provided inadequate evidence of carcinogenicity, and it is currently listed as possibly carcinogenic to humans (Baan, 2007). However, rats are extremely sensitive to chronic lung inflammation resulting from particle overload (Warheit and Gardner, 2006), and there is a question whether the same differences between fine and ultrafine particles apply to humans. A human inhalation exposure study conducted with ultrafine Nanoparticles in the Lung 331 carbon black showed subtle changes in leukocyte subsets and adhesion molecule expression that were consistent with effects on vascular endothelial function and also found effects on heart rate variability and on cardiac repolarization (Frampton et al. Differences in the effects of inhaled and instilled nanotubes may have been due to the size and distribution of aggregations in the lung (Li et al. Laboratory studies with resuspended manufactured inorganic powders and with freshly generated ultrafine aerosols have also shown size-dependent differences in toxicity (Oberdörster, 2001). However, experiments in rats have shown that characteristics of TiO2 and SiO2 particles other than size affect potency (Warheit et al. Rats exposed to 5 mg kgÀ 1 of three forms of ultrafine titanium dioxide showed differing lung inflammation and histopathological responses that could be associated with crystal structure, inherent pH of the particle microenvironment, or surface reactivity (Warheit et al. A study with nanoscale and fine quartz particles in rats showed pulmonary inflammation responses that were not consistent with particle size, but that correlated with surface reactivity (Warheit et al. There are indications that instillation administration of aqueous particle suspensions causes lung effects that are not seen with similar deposited doses from inhalation (Jacobson et al. This is a serious limitation when attempting to use in vitro data for risk assessments, but is a great advantage for isolating biochemical processes for quantitative hypothesis testing. Most in vitro studies assess cytotoxicity at 4­24 h, so the relevance of cell death in culture to long-term tissue damage and repair in the intact lung is questionable. Cell death is indirectly measured in animal exposure experiments by changes in markers of leaking cells (such as lactose dehydrogenase and protein in the lavage fluid) or by changes in viable versus nonviable cell counts in lavage fluid (using Trypan blue or propidium iodide staining). A study that used carbonyl iron, crystalline silica, precipitated amorphous silica, nanosized zinc oxide, and fine-sized zinc oxide with particle size ranging from 90 to 500 nm to compare in vitro measurements to in vivo toxicity profiles found little correlation, and concluded that further assay development was needed (Sayes et al. Cytokines play a key role in functions such as recruiting macrophages to the site 332 Nanoparticles in the Lung of an infection and promoting acute wound stasis and tissue regeneration after injury. Chronic proinflammatory cytokine signaling has been reasonably well established as a response to occupational particles, especially respirable silica and asbestos (Rimal et al. Normal levels of cytokines vary widely within groups of both healthy individuals and patients with chronic obstructive pulmonary disease and likely result from multiple cell types interacting through both space and time (Bhowmik et al. Specific cytokines have multiple functions, and multiple cytokines are involved in complex responses such as the lung repair and remodeling that takes place in response to damage from inhaled particles. Particle size, shape, surface charge, and bound functional groups are being manipulated, and this type of research is likely to result in a better understanding of the interactions between particle characteristics and cellular membrane receptors. The state of particle aggregation in the aqueous mediadextremely variable, difficult to control or characterizedalso affects cell uptake (Limbach et al. The inconsistency in reported uptake mechanisms and target organelles may be due to the differences between studies in the cell types studied, the specific conditions of cell­particle interaction, and particle characteristics, including states of particle aggregation or direct deposition onto adherent cell membranes. The fraction of the initial dose that reaches organs such as the brain, spleen, and liver is small but robustly quantifiable (Kreyling et al. Impaired clearance causes excessive particle buildup in the lungs leading to chronic inflammation that is largely independent of the specific chemical substance (Baan, 2007). The resulting nonspecific accumulation of particles then leads to observable lung pathologies. Originally, the hypothesis was stated in terms of a deposited particle volume, for example, 1 ml of particles per gram of lung (Oberdörster, 1995). More recent evidence suggests that the threshold can be correlated with total particle surface area, rather than particle mass or volume, which implies increased potency for nanosized particles due to their high specific surface area. A burden of 200 cm2 of particles is roughly equivalent to 200 mg of 60 nm particles, but only 16 mg of 5 nm particles. These results from multiple original studies strongly suggest that total particle surface area deposited in the lung may be the most appropriate measurement of dose. Alternatively, mobility may be affected by excessive particle­cell and cell­cell chemotactic interactions, and migratory inhibition factors (Morrow, 1988). Ultrafine particles have been shown to cause cytoskeletal dysfunctions in macrophages (Möller et al. Hypotheses regarding particle-induced oxidative stress are tested by both direct and indirect means. Direct tests include detection and quantification of the reactive intermediates by spin trapping (Leonard et al. Indirect tests include measuring the depletion of cellular antioxidants, such as glutathione, measuring concentrations of oxidized biomolecules, and measuring upregulation of genes associated with antioxidant defenses. Particle-induced responses are widely reported in both macrophage and epithelial cell cultures (Kang et al. Particle-induced oxidative stress may be a unifying mechanism across many particle types (Li et al. Particle-induced inflammation may weaken defenses against pathogenic bacteria, or infection may increase cell permeability allowing increased translocation of particles from the alveoli. These are somewhat speculative mechanisms that have been investigated experimentally (Inoue et al. For example, most elemental metal powders rapidly develop a surface oxide layer when exposed to air. Particles in contact with biological fluids become coated both transiently and permanently with many proteins and other surfaceactive biomolecules (Lundqvist et al. This high specific surface area provides unique physical properties that are exploited for material science applications but that can also lead to biological reactivity and, potentially, toxicities. The high specific surface area can affect toxicity by (1) carrying adsorbed small molecules on the particle surface, (2) surface interactions between the solid particle and the biological macromolecules, and (3) heterogeneous catalytic chemical reactions on the particle surface. For spheres, this is a simple geometrical effect, but many nanomaterials are deliberately formed as tubes, fibers, dendrimers, or other nanosized structures deliberately engineered to provide higher surface than an equivalent mass sphere. Similar area scaling effects are seen with miniaturization of surface topology, porosity, texturing, and high-density fabrication of submicron features. Hence, surface structure and composition, and therefore intrinsic reactivity, are perhaps the dominant structuredetermining properties in nanomaterials. High specific surface area materials have a high interfacial reactivity for adsorption of small molecules, heterogeneous chemical reactions, and interaction with biomolecules. Compared to bulk-phase atoms, the distinguishing features of surface atoms in nanosystems are (1) their lower coordination number and (2) their increased exposure to reactive species in the environment. The relative fraction of surface atoms to bulk atoms in a structure, called dispersion, exhibits a power law scaling in the nanoscale regime (Grainger and Castner, 2008). Table 1 shows the calculated surface area per mass for 100 mg of carbon in forms ranging from a single, nonporous graphite sphere to individual fullerenes and nanotubes. Although the exact values are subject to the choice of simplifying assumptions, the table clearly illustrates that the surface area increases enormously as the particle size approaches molecular dimensions. Increased surface area per mass has several potential effects including higher solubility, higher catalytic activity, adsorption of small molecules on the surface, and interaction between the solid surface and the biological macromolecules. Table 1 Carbon form Calculated specific surface area for various carbon particles Geometric size 10 mm 1 mm 100 nm Polydispersed 5 Â 100 nm 1 nm Specific area (m2 g­1) 0. The release of soluble components from inhaled particles can occur in many different physiological compartments with differing pH and concentration of organic molecules that can serve as chelators. The term "low solubility" refers to negligible dissolution on a timescale comparable to the particle retention half-time in the lung. Solubility increases for smaller particles because of both kinetic and physicochemical effects. The increased area per mass in contact with the aqueous phase results in more rapid dissolution of the particle. The effects of surface tension increase the solubility of smaller particles (Mihranyan and Strømme, 2007). Surface concentration of adsorbed endogenous molecules on particle surface has also been hypothesized as a mechanism of action. For example, cytokines can be locally concentrated on the surface of carbon black and diesel exhaust particles resulting in locally enhanced tissue responses (Seagrave et al. One effect of the disrupted crystal lattice structure on the particle surface is that most particles in aqueous solution have both unresolved intrinsic chemical reactivity at their surface and a net surface electrostatic charge (despite absence of a formal charge) that is balanced by a diffuse cloud of counterions. A particle with a negative surface charge will be surrounded by metal cations and hydrogen ions, possibly resulting in a locally low-pH region a few molecular diameters thick. Veronesi has provided experimental evidence suggesting that particle surface charge induces cell responses through acid-sensitive ion channels and voltage-gated ion channels (Oortgiesen et al. For example, SiO2 is a lattice where each silicon is bonded to four oxygen atoms and each oxygen is bonded to two silicon atoms, a structure that cannot continue on the surface. These surface effects increase the number of sites available for catalytic reactions compared to an equal mass of larger particles. Wellknown examples of particle-phase catalysis include the photocatalytic behavior of TiO2, Fenton reaction cycling of iron atoms in the presence of a biological reductant, and industrial-scale hydrogenation reactions on the surface of precious metals such as gold and platinum. Progress in addressing these questions will require continued research, method development and validation, and careful consideration of surface chemistry and particle physical stability and aggregation in the experimental scenarios. All nanomaterials for drug delivery and medical imaging will undergo extensive testing as part of the normal pharmaceutical product development process, and there is financial incentive to do this work. It is less clear how to prioritize research funding and toxicology testing for these cases. A drug or single pollutant chemical is a welldefined molecular-scale entity characterized by a single chemical structure, or is at worst a quantifiable mixture of defined chemical compounds. A scientifically sound toxicology screening strategy for novel forms of nanosized materials, whether a drug, an imaging agent, or an industrial chemical, requires both particle characterization and a systematic series of biological assays (Oberdörster et al. Physical and chemical characterization of nanomaterials is difficult due to their properties, size, and methods capable of producing information under relevant testing conditions (Grainger and Castner, 2008; Jones and Grainger, 2009). Particle description includes at a minimum the identification of the source and lot number, measurement of primary particle size and size distribution, surface charge, shape, composition, and testing for trace contaminants that could confound results. Lot-to-lot variation may be a problem when working on novel nanomaterials produced in research laboratories or by small start-up companies. Size and size distribution can be measured by electron microscopy or dynamic light scattering. Cluster size in aerosol form can be measured by laser light scattering for structures larger than about 400 nm and by electrophoretic mobility for smaller particles (Baron and Willeke, 2001). Particle size in aqueous suspension can be measured by dynamic light scattering (Murdock et al. Agglomerate size in aqueous suspension is affected by pH, ionic strength, surfactants, and biological macromolecules, while true aggregates (primary particles fused by strong bonds) will have reasonably constant size. Surface area can be estimated by calculation from size and shape measured by microscopy, but this is subject to great uncertainty. The typical and mathematically convenient assumption of monodisperse, nonporous spheres is seldom true in practice. The surface measured by nitrogen absorption is the surface on a scale comparable to the mean free path of a gas molecule. Pores in particles smaller than about 50 nm will not be accurately measured by gas adsorption surface area. Chemical characterization requires addressing both the bulk composition and the surface atom composition. Determining trace contaminants requires looking for them by choosing appropriate protocols. Quantification of adsorbed species on particle surfaces requires expensive equipment and techniques. Much surface analysis technology was developed for determining surface atoms on flat surfaces, such as polished semiconductors, and these methods are difficult to extend to powders.

Generic 5 mg kemadrin with amex. Signs symptoms diagnosis and prevention of the deadly Swine Flu (H1N1) virus 3/5.

Syndromes

• Echocardiogram
• Floppy infant (poor muscle tone)
• Impotence
• Hearing problems do not go away or become worse
• Decreased urine output
• Rash of the mouth, genitals, and anus
• Cut down on your salt intake. Limit table salt, or flavor intensifiers that contain salt, such as monosodium glutamate (MSG).
• Weakening of the bones, fractures, joint disorders
• The skin on your scalp under the involved area is red, scaly, or otherwise abnormal
• Prolactin blood test

The ideal solution should have a low osmolarity (210­250 mmol/l) and a sodium content of 50­60 mmol/l treatment 0f ovarian cyst 5 mg kemadrin with amex. This means that the majority of commercially available drinks are far less suitable as rehydration agents treatment 7th feb discount kemadrin 5 mg buy. In more extreme cases symptoms schizophrenia order 5 mg kemadrin with amex, intravenous fluids can be given and will usually reverse any metabolic acidosis associated with the illness medications online order 5 mg kemadrin free shipping. How to handle uncertainty in the diagnosis of this symptom Infectious diarrhoea will often have signs or symptoms of underlying infection (fever medicine for vertigo order generic kemadrin online, leucocytosis, raised inflammatory markers), and a combination of stool samples and mucosal biopsies will often pinpoint a pathogen. In patients with worsening symptoms, empirical antibiotics can be given after liaison with the local microbiologist. In infections that are improving with conservative therapy, antibiotics will often 88 29 Chronic diarrhoea Satish Keshav and Alexandra Kent Definition of the symptom Diarrhoea is defined as the passage of more than three stools per day or a stool weight >400 g/day, and duration 4 weeks is regarded as chronic. Patients who are 50 years old should undergo colonic imaging to check for colorectal cancer. Although colorectal cancer is unlikely to present with diarrhoea only, this is an anxiety for patients and referrers and, with the likely introduction of colorectal cancer screening in asymptomatic adults over the age of 50 years, it seems prudent to screen those who have symptoms. It is important to compare current symptoms to what the patient considers to be their usual bowel habit. Specific triggers should be sought; commencing new medications, recent surgery, travel, food poisoning or infection, and stress should all be checked. Examination should include the perineum, anus, and rectum, checking for evidence of inflammatory bowel disease; constipation and faecal impaction with paradoxical diarrhoea; and corroborative evidence of diarrhoea with excoriation of the perianal skin. Differential diagnosis the list of possible causes of chronic diarrhoea is long, and likely to be incomplete as many rare conditions may present unusually with diarrhoea as part of the symptom complex (Table 29. The key to the diagnostic process is to consider the context in which the presentation occurs, and the most likely causes. Colorectal cancer rarely presents only with diarrhoea, although this is frequently the diagnosis which is most feared and the one which might prompt attendance in primary and secondary care. It is the commonest reason for referral to secondary care gastroenterology clinics. Previous surgery: Bowel resection can lead to diarrhoea due to reduced water absorption (colonic resection), bile salt or fat malabsorption (terminal ileal resection), decreased transit time, or small bowel bacterial overgrowth. Systemic disease: Multiple diseases can be associated with diarrhoea, through various mechanisms. Pancreatic disease: Diarrhoea in a patient with a history of excess alcohol consumption or pancreatitis may be due to pancreatic exocrine insufficiency, and resultant fat malabsorption. Family history: There is a strong familial association recognized in colorectal cancer, inflammatory bowel disease, and coeliac disease. Medication history: Four per cent of cases are drug related, and symptoms may develop some weeks or months after commencing new medications. Uncommon Rare Key diagnostic tests the key test in this diagnosis rests entirely on the context. In other contexts, it is critically important to check for inflammatory bowel disease or colorectal cancer, and here either colonic 89 imaging or colonoscopy and biopsy are the key tests. In both cases, the key test can be performed on a blood sample, with no need for colonoscopy, although many physicians consider it necessary to confirm the diagnosis of coeliac disease with duodenal biopsy. Faecal elastase levels: Pancreatic insufficiency can be diagnosed by the finding of reduced faecal elastase levels. Glucose or lactulose hydrogen breath tests: these test for small bowel bacterial overgrowth. Gut hormone levels: this test requires a fasting blood sample and tests for levels of gastrin, vasoactive intestinal peptide, pancreatic polypeptide, glucagon, and neurotensin. For accurate gastrin levels, H2 antagonists should be stopped 24 hours prior to the test, and proton-pump inhibitors stopped 6 days prior to the test. Enteroscopy: this is not often required; it is usually reserved for identifying small bowel lesions seen on radiological examination. Urinary 5-hydroxyindoleacetic acid: this is raised in patients with carcinoid syndrome. However, patients with continuing weight loss, anaemia, or persistently raised inflammatory markers may require intensive investigation, and referral to specialist and tertiary care. Changes from microscopic colitis and inflammatory bowel disease can be patchy, and systemic inflammatory conditions can remit spontaneously temporarily, so that repeated investigation may be necessary when the first tests are normal. In difficult cases, in-hospital assessment of diarrhoea may be necessary to quantify stool volume and to determine if diarrhoea is dependent on oral intake or not. Secretory diarrhoea due to endocrinopathy and secretory tumours of the bowel continues even when the patient does not eat or drink, while diarrhoea due to malabsorption or inflammation tends to be improved when oral intake ceases. Introduction to therapy Therapy is dictated by the underlying diagnosis, and dealt with in the appropriate section. Symptomatic relief of diarrhoea can be readily achieved using loperamide, diphenoxylate, or codeine phosphate. Codeine is best avoided because of its sedating and potentially addictive properties. Patients often learn to cope with their symptoms, 90 30 Rectal bleeding Satish Keshav and Alexandra Kent Definition of the symptom Rectal bleeding (haematochezia) refers to the passage of bright red blood per rectum. Inflammatory bowel disease Context Rectal bleeding is a common symptom, affecting all age groups, with the highest incidence in the sixth and seventh decades and associated with a higher mortality and morbidity with increasing age. Epidemiological studies have shown rectal bleeding to occur in nearly 1% of hospital admissions. The majority of patients will present to their general practitioner and will be referred to colorectal or gastroenterology outpatient clinics. Neoplasia Family history, smoker Arteriovenous malformations/ angiodysplasia Ischaemic colitis Aortic stenosis Ischaemic heart disease, peripheral vascular disease, diabetes, hypertension, hyperlipidaemia Previous pelvic radiotherapy Severe abdominal pain, bloody diarrhoea Approach to diagnosis the initial approach to patient care should be assessment of their haemodynamic stability, including vital signs. The most important diagnosis to be excluded is colorectal cancer, especially in older (>50 years) patients. A concise history and examination should significantly narrow the differential diagnosis. Upper gastrointestinal bleed Key diagnostic tests Endoscopic evaluation by flexible sigmoidoscopy or colonoscopy is the key test and allows biopsies to be taken from abnormal lesions. Bleeding lesions can be treated endoscopically by sclerotherapy or cauterization; in these instances, biopsies are usually deferred until active bleeding has settled. Diagnostic tests can usually be deferred until bleeding has settled and patients have received pre-endoscopic bowel purgatives. In cases where bleeding is torrential with associated haemodynamic compromise, mesenteric angiography may identify the bleeding site, and allow embolization of the responsible vessel. Specific therapeutic options are as follows: Haemorrhoids: stool softeners, high-fibre diet, band ligation, local injection Solitary rectal ulcer: endoscopic treatment of active bleeding ulcer using endoscopic adrenaline injection or cauterization Diverticular disease: the majority of cases will stop bleeding spontaneously; some centres advocate endoscopic adrenaline injection, although endoscopic therapy does incur a higher risk of colonic perforation. Arteriovenous malformation: usually endoscopically cauterized using argon plasma coagulation Radiation proctitis: Bleeding points can be treated endoscopically using argon plasma coagulation. Inflammatory bowel disease and colorectal cancer: see Chapters 203 and 204, respectively. Prognosis Rectal bleeding is a common symptom and as such has a poor positive predictive value for diagnoses such as colorectal cancer. How to handle uncertainty in the diagnosis of this symptom Since rectal bleeding is associated with colorectal cancer, all patients age 50 years, or <50 years and without an obvious cause for bleeding, should have a test to exclude colon cancer. In patients with normal investigations and stable haemoglobin, rectal bleeding is usually due to local anorectal causes, which may not require further treatment. Hepatic jaundice Conditions leading to a reduction in the capacity of the liver to metabolize and excrete bilirubin cause hepatic jaundice. All causes of acute hepatitis can cause hepatic jaundice in which bilirubin is usually conjugated. Differential diagnosis the differential diagnosis of jaundice, ordered by probability, is shown in Table 31. Context As erythrocytes are destroyed, haemoglobin is broken down, releasing haem, which is further broken down to produce bilirubin. In the colon, it is metabolized by bacteria to urobilinogen and then stercobilinogen, and is subsequently oxidized to stercobilin. A small amount of urobilinogen is absorbed from the intestine and excreted in the urine, giving urine its yellow colour. Eighty per cent of bilirubin comes from haemoglobin, and the remainder comes from breakdown of other iron-containing proteins, such as myoglobin and cytochromes. Jaundice also occurs when the flow of bile is obstructed, for instance, by gallstones. In these cases, hepatic function might not be impaired profoundly, although, again, the disease process causing biliary obstruction, such as malignancy, may be advanced by the time jaundice is apparent. Post-hepatic jaundice Post-hepatic jaundice is also known as obstructive jaundice, as it is caused by a blockage within the biliary system, resulting in failure of biliary drainage. The blockage prevents bile from being excreted into the gastrointestinal tract, and the stool subsequently becomes pale. Causes of post-hepatic jaundice include gallstones, pancreatic tumours, pancreatic cysts, cholangiocarcinomas, and, in neonates, biliary atresia. Hepatic impairment It is important to determine the extent of hepatic impairment associated with jaundice by measuring serum transaminases, prothrombin time, and albumin, and by checking clinically for evidence of hepatic dysfunction. The following factors also give clues as to the underlying diagnosis: Pain: Impacted gallstones causing biliary obstruction will be associated with biliary colic and classically right upper quadrant abdominal pain. Alcohol intake: this suggests liver injury and raises the possibility of more chronic liver damage and cirrhosis. Weight loss: Pancreatic tumours classically present as painless obstructive jaundice, and may well have associated symptoms such as weight loss and cachexia. Viral symptoms: the viral illnesses which most commonly cause acute jaundice are hepatitis A and infectious mononucleosis (glandular fever). Hepatitis A often presents with fever, fatigue, diarrhoea, anorexia, nausea, and abdominal pain. Glandular fever presents with fatigue, sore throat, fever, arthralgia, and lymphadenopathy. Many other viruses can cause jaundice, including the hepatitis B virus, the hepatitis E virus, cytomegalovirus, and so on. Medications: the commonest causes of drug-induced hepatitis are co-amoxiclav, flucloxacillin, chlorpromazine, and drugs used for antituberculosis therapy. Any recent changes to medications should be noted, as liver derangement is a common side effect. Approach to diagnosis the initial approach is to determine if the jaundice is pre-hepatic, intra-hepatic, or post-hepatic. Pre-hepatic jaundice Causes of pre-hepatic jaundice include conditions such as sickle cell anaemia, spherocytosis, glucose-6-phosphate dehydrogenase deficiency, and haemolytic uraemic syndrome, which associated with an increased rate of haemolysis and thus lead to an increased production of unconjugated bilirubin. Serum bilirubin will be unconjugated and, since unconjugated bilirubin is not water soluble, there will be no bilirubin in the urine. Acute cholelithiasis and cholangitis can, however, be associated with markedly raised transaminases. The most important test is to perform is an ultrasound scan of the biliary tract, to determine if there is biliary obstruction. Ultrasonography can diagnose biliary obstruction, gallstones, pancreatic masses, biliary tree dilatation, and liver echogenicity. Prothrombin time and albumin concentration provide a measure of hepatic synthetic function, which is particularly important in acute jaundice where there is concern about liver failure. The majority of drug-induced jaundice require removal of the offending agent and close monitoring for signs of liver failure. Alcoholic liver disease and alcoholic hepatitis require supportive treatment with laxatives, nutrition, and an investigation into underlying precipitant of decompensation. Prognosis the prognosis is as follows: · the overall prognosis of a patient with jaundice depends on the underlying disease process. Other diagnostic tests the following blood tests may give further information regarding the cause of jaundice: Unconjugated and conjugated bilirubin: this test can ascertain whether the rise in bilirubin occurs before or after conjugation in the liver. Tests for haemolysis: Haemolysis can be confirmed from a blood film, a reticulocyte count, haptoglobin levels, the lactate dehydrogenase test, and/or the Coombs test. Viral serology: Hepatitis A IgM is positive in acute hepatitis A (IgG is not diagnostic). Infectious mononucleosis is diagnosed by the presence of Epstein­Barr virus IgM, or the heterophile antibody test (the monospot test). Infectious mononucleosis may also be associated with thrombocytopaenia, raised transaminases, and a raised erythrocyte sedimentation rate. In the setting of fever and obstructive jaundice, it is safer to advocate early antibiotics if ascending cholangitis is a possible diagnosis. Introduction to therapy Treatment of jaundice is dependent on the underlying cause. Most patients with ascites usually have a known diagnosis of cirrhosis, malignancy, or heart failure. Alcoholic hepatitis Context For patients newly presenting with ascites, the diagnostic problem is usually to differentiate between cirrhosis and malignancy. For patients with established liver disease, ascites represents a deterioration of their liver function, the development of a hepatocellular carcinoma, or another complication. In malignancy, ascites denotes the development of peritoneal deposits or massive liver metastases. Spontaneous bacterial peritonitis Budd­Chiari syndrome Approach to diagnosis the diagnosis may be obvious from the context, but can be confirmed with imaging and a diagnostic paracentesis. Massive liver metastases Key diagnostic tests Diagnostic paracentesis In obvious ascites, this should not wait for the ultrasound scan. Severe thrombocytopenia and impaired clotting are only relative contraindications. Patients with a platelet count lower than 20 × 103/l should receive an infusion of platelets before the procedure. Introduction to therapy Ascites with portal hypertension Patients with alcoholic cirrhosis are often also fond of salt. They can improve dramatically with abstention from alcohol, and with salt restriction.

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