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- Clinical Associate Professor, Department of Pharmacy Practice, College of Pharmacy, Purdue University, West Lafayette
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One study revealed that only 60% of the patients with free-end partial dentures were still wearing the prosthesis after 4 years blood pressure young male purchase amlodipine 2.5mg on line. The mechanical retention provided by implants for a prosthesis is dramatically improved over one only retained by the soft tissues blood pressure drops when standing cheap 2.5 mg amlodipine with amex. Many treatment options may exist for these patients arteria rectalis superior cheap amlodipine 5 mg overnight delivery, and the amount of implant support can vary depending the Oral Cavity and Nutrition 261 on the number and location of dental implants placed hypertension 2012 cheap amlodipine 2.5 mg line. The end result is that an implant prosthesis patient may exhibit occlusal forces similar to those of a patient with a fixed restoration supported by natural teeth. It found that the prosthetic and implant cumulative survival rates were both in excess of 90%. Another literature review indicated that implants placed in the anterior mandible have a success rate better than 95% and that patients reported a high degree of satisfaction with this treatment. Regular dental care to replace missing teeth and preserve denture function may be critical to the maintenance of dietary quality and adequate nutrient intake in the elderly. However, the reduction of saliva in the elderly is mostly affected by micronutrient deficiencies, dehydration, and medications. Nevertheless, there are a number of other circumstances that may cause xerostomia, such as medications, systemic diseases, and local, developmental, and iatrogenic factors (see Box 15. Approximately 25% of older adults have reported this condition, mainly as a result of medications or systemic conditions. Patients who suffer this problem clinically demonstrate a reduction in salivary secretions, and the residual saliva appears either thick or frothy. The mucosal surface seems dry and the dorsal tongue often looks fissured and lacks filiform papillae. Oral candidiasis is prevalent due to a reduction in the antimicrobial activity provided by saliva. Even though there is not strong evidence, some reports have suggested that xerostomia affects nutrition. It has been shown that older adults with xerostomia are more likely to avoid crunchy vegetables and dry and sticky foods. Lower caloric and nutrient intakes have also been observed in subjects with this condition. Artificial saliva and intake of copious amounts of water throughout the day may help to reduce discomfort. In addition, chewing sugarless gum and snacking on nonadherent food such as celery and carrots can stimulate salivary flow. The utilization of oral hygiene products that contain lactoperoxidase, lactoferrin, and lysozyme may be helpful. Systemic sialogogues such as systemic pilocarpine or cevimeline hydrochloride may be effective promoters of salivary secretion. On the other hand, the condition may be secondary to medications, and discontinuation, medication dose, or a substitute drug may be considered by the physician. Dental caries, periodontal disease, oral cancer, infectious diseases, tooth loss, and xerostomia are some of the more common conditions that may develop. The lack of appropriate therapy can have an effect on systemic functions and accordingly on the quality of life. The most important aspect in which oral health is perceived by elderly people as affecting the quality of life is its effect on eating. Also, diet and nutrition are major factors in the etiology and pathogenesis of craniofacial diseases and disorders. In the geriatric population, there is a decreased ability to identify foods based on taste. Olfactory and gustatory changes, which may be related to both aging and disease, contribute to altered nutritional selections, thereby complicating certain medical conditions. The Oral Cavity and Nutrition 263 Dental status is affected by several factors in older individuals.
They drain from the body tissues via a system of vessels that coalesce and eventually enter the right and left subclavian veins at their junctions with the respective internal jugular veins blood pressure 6050 buy amlodipine 10 mg visa. The lymph vessels contain valves and regularly traverse lymph nodes along their course pulse pressure and stroke volume relationship buy 5mg amlodipine visa. The ultrastructure of the small lymph vessels differs from that of the capillaries in several details: No fenestrations are visible in the lymphatic endothelium; very little if any basal lamina is present under the endothelium; and the junctions between endothelial cells are open arrhythmia consultants of connecticut order amlodipine 5 mg otc, with no tight intercellular connections heart attack young squage cheap amlodipine 10 mg amex. Organ Brain (excluding circumventricular organs) Skin Skeletal muscle Lung Heart Gastrointestinal tract (intestinal mucosa) Conductivitya 3 Type of Endothelium In the fingers, palms, and ear lobes, short channels connect arterioles to venules, bypassing the capillaries. These arteriovenous (A-V) anastomoses, or shunts, have thick, muscular walls and are abundantly innervated, presumably by vasoconstrictor nerve fibers. They contain relatively little smooth muscle, but considerable venoconstriction is produced by activity in the noradrenergic nerves to the veins and by circulating vasoconstrictors such as endothelins. The intima of the limb veins is folded at intervals to form venous valves that prevent retrograde flow. The way these valves function was first demonstrated by William Harvey in the 17th century. No valves are present in the very small veins, the great veins, or the veins from the brain and viscera. Fenestrated Glomerulus in kidney a 15,000 3 1 Units of conductivity are 10 13 cm s dyne. Therefore, angiogenesis, the formation of new blood vessels, is important during fetal life and growth to adulthood. It is also important in adulthood for processes such as wound healing, formation of the corpus luteum after ovulation, and formation of new endometrium after menstruation. Abnormally, it is important in tumor growth; if tumors do not develop a blood supply, they do not grow. During embryonic development, a network of leaky capillaries is formed in tissues from angioblasts: this process is sometimes called vasculogenesis. Vessels then branch off from nearby vessels, hook up with the capillaries, and provide them with smooth muscle, which brings about their maturation. Angiogenesis in adults is presumably similar, but consists of new vessel formation by branching from pre-existing vessels rather than from angioblasts. Flow in any portion of the vascular system is equal to the effective perfusion pressure in that portion divided by the resistance. The effective perfusion pressure is the mean intraluminal pressure at the arterial end minus the mean pressure at the venous end. To avoid dealing with such complex units, resistance in the cardiovascular system is sometimes expressed in R units, which are obtained by dividing pressure in mm Hg by flow in mL/s (see also Table 341). Ultrasonic waves are sent into a vessel diagonally, and the waves reflected from the red and white blood cells are picked up by a downstream sensor. The frequency of the reflected waves is higher by an amount that is proportionate to the rate of flow toward the sensor because of the Doppler effect. Indirect methods for measuring the blood flow of various organs in humans include adaptations of the Fick and indicator dilution techniques described in Chapter 31. One example is the use of the Kety N2O method for measuring cerebral blood flow (see Chapter 34). Another is determination of the renal blood flow by measuring the clearance of para-aminohippuric acid (see Chapter 38). A considerable amount of data on blood flow in the extremities has been obtained by plethysmography (Figure 3220). Changes in the volume of the forearm, reflecting changes in the amount of blood and interstitial fluid it contains, displace the water, and this displacement is measured with a volume recorder. When the venous drainage of the forearm is occluded, the rate of increase in the volume of the forearm is a function of the arterial blood flow (venous occlusion plethysmography). Blood vessels are not rigid tubes, and the blood is not a perfect fluid but a two-phase system of liquid and cells. Therefore, the behavior of the circulation deviates, sometimes markedly, from that predicted by these principles. Within the blood vessels, an infinitely thin layer of blood in contact with the wall of the vessel does not move.
Tapering of corticosteroids heart attack vs heart failure purchase 10mg amlodipine, when appropriate prehypertension blood pressure treatment amlodipine 10 mg low cost, is an art rather than a science and may require frequent adjustments to heart attack keychain amlodipine 5mg cheap the tapering schedule blood pressure natural buy amlodipine 10mg low price, depending on how the patient is tolerating the taper. Although there is no one correct strategy for tapering, general recommendations based on clinical experience are provided for consideration. First, the clinical team should determine whether a rapid or slow tapering schedule is desired. Generally, shorter use of corticosteroids can be tapered fast, whereas longer durations of treatments require slower tapering. A general observation is that the duration of a taper should be 33100% of the treatment course. When using prednisone as an example, tapering of daily doses of 20 mg can be made in 10-mg increments, with adjustments made every few days to weeks, depending on the duration of the taper (Table 3). When a daily dose of 20 mg daily is reached, it is useful for the patient to see the clinician for evaluation about how the tapering regimen is being tolerated. At any point during a tapering regimen, if the patient develops signs of adrenal insufficiency, then the taper can be stopped or slowed until the patient is stable. Drug Interactions Drug interactions with systemic corticosteroid therapies are ubiquitous and have pharmacodynamic and pharmacokinetic foundations. Many are related to similar adverse reaction profiles with concomitant therapies, whereas pharmacokinetic interactions are often based on cytochrome P450 3A4 isoenzyme interactions. Corticosteroids are metabolic substrates for cytochrome 3A4, so any agents that inhibit or induce 3A4 activity will either increase or decrease corticosteroid activity. The addition of ester groups was also found beneficial to reduce systemic exposure. In terms of pharmacology, they differ in physicochemical properties, selectivity for the glucocorticoid receptor, potency, and pharmacokinetics. In fact, for the clinician, the interaction and mix of positive and negative attributes for specific molecules present challenges in determining if an individual agent offers significant advantages in either efficacy or safety. Intermittent use may be beneficial for some patients but is not a standard of care practice in the U. Efforts have also been directed at improving receptor affinity and prolonging binding at pulmonary receptors. The result has been new agents with improved receptor selectivity, potency, and targeting of the lung with reduced oral bioavailability and high systemic clearance. Among the available agents, beclomethasone dipropionate and ciclesonide are prodrugs that are converted to their active forms by esterases in the lung and other tissues. Corticosteroid receptors in the lungs are similar to receptors throughout the body; therefore, a high affinity for corticosteroid receptors in the lung would also be exhibited at systemic receptors. As a result, a high affinity for systemic receptors would be associated with a greater risk for systemic effects that are undesirable. Fluticasone propionate also has high lipophilicity but does not conjugate with fatty acids, which would allow more residence time at the pulmonary receptor. Mometasone exhibits high receptor binding affinity and protein binding; it is lipophilic and undergoes high first-pass metabolism. Budesonide does form fatty acid conjugates, but, because of lower lipophilicity, pulmonary retention may be lower. This molecule is purported to have a high affinity for the glucocorticoid receptor, high lipophilicity and fatty acid conjugation, and high protein binding and systemic clearance. However, protein binding of available agents is relatively consistent, ranging from 71% to 99%, lipophilicity varies 4-fold, and halflives are generally 5 h, with the exception of fluticasone propionate at 14 h. Perhaps, because of the similarities or the numerous differences among agents, no single agent seems to have significant advantages or confers additional risks in clinical practice. Of note, the inhalational device used to administer the therapeutic agent also has a significant influence on local and systemic effects because these characteristics can vary between devices. The potency of topical corticosteroids varies, depending on the specific agent, and characterizing the relative potency among available therapies is challenging and imperfect. Although the fraction of exhaled nitric oxide shows promise in assessing relative potency, it is most commonly used to assess asthma control. Based on these criteria, one group of investigators suggests that the relative potency of available agents (from high to low) is fluticasone furoate mometasone fluticasone propionate beclomethasone ciclesonide budesonide triamcinolone flunisolide. The dose-response occurs in a log-dose linear fashion, so that doubling of the dose often does not result in significant improvements in the outcome parameter. In fact, in some clinical trials, a dose-response relationship could not be established, and, in others, differences in the doseresponse between agents have been difficult to determine.
Following secretion hypertension powerpoint presentation discount 5mg amlodipine with mastercard, the phospholipids of surfactant line up in the alveoli with their hydrophobic fatty acid tails facing the alveolar lumen hypertension diabetes generic amlodipine 2.5 mg without prescription. The surfactant molecules move further apart as the alveoli enlarge during inspiration prehypertension meaning in hindi purchase 10 mg amlodipine visa, and surface tension increases blood pressure monitoring chart template discount 10mg amlodipine with mastercard, whereas it decreases when they move closer together during expiration. Formation of the phospholipid film is greatly facilitated by the proteins in surfactant. Because saline reduces the surface tension to nearly zero, the pressurevolume curve obtained with saline measures only the tissue elasticity (Figure 3512), whereas the curve obtained with air measures both tissue elasticity and surface tension. The difference between the two curves, the elasticity due to surface tension, is much smaller at small than at large lung volumes. Saline: lungs inflated and deflated with saline to reduce surface tension, resulting in a measurement of tissue elasticity. Air: lungs inflated (Inf) and deflated (Def) with air results in a measure of both tissue elasticity and surface tension. The fetus makes respiratory movements in utero, but the lungs remain collapsed until birth. After birth, the infant makes several strong inspiratory movements and the lungs expand. Surface tension in the lungs of these infants is high, and the alveoli are collapsed in many areas (atelectasis). Patchy atelectasis is also associated with surfactant deficiency in patients who have undergone cardiac surgery involving use of a pump oxygenator and interruption of the pulmonary circulation. In addition, surfactant deficiency may play a role in some of the abnormalities that develop following occlusion of a main bronchus, occlusion of one pulmonary artery, or long-term inhalation of 100% O2. Because pressure times volume (g/cm2 Ч cm3 = g Ч cm) has the same dimensions as work (force Ч distance), the work of breathing can be calculated from the relaxation pressure curve (Figures 3510 and 3514). Note that the relaxation pressure curve of the total respiratory system differs from that of the lungs alone. The amount of elastic work required to inflate the whole respiratory system is less than the amount required to inflate the lungs alone because part of the work comes from elastic energy stored in the thorax. The transmural pressure is intrapulmonary pressure minus intrapleural pressure in the case of the lungs, intrapleural pressure minus outside (barometric) pressure in the case of the chest wall, and intrapulmonary pressure minus barometric pressure in the case of the total respiratory system. From these curves, the total and actual elastic work associated with breathing can be derived (see text). If the air flow becomes turbulent during rapid respiration, the energy required to move the air is greater than when the flow is laminar. The value rises markedly during exercise, but the energy cost of breathing in normal individuals represents less than 3% of the total energy expenditure during exercise. The work of breathing is greatly increased in diseases such as emphysema, asthma, and congestive heart failure with dyspnea and orthopnea. The respiratory muscles have length tension relations like those of other skeletal and cardiac muscles, and when they are severely stretched, they contract with less strength. They can also become fatigued and fail (pump failure), leading to inadequate ventilation. Note that because intrapulmonary pressure is atmospheric, the more negative intrapleural pressure at the apex holds the lung in a more expanded position at the start of inspiration. Further increases in volume per unit increase in intrapleural pressure are smaller than at the base because the expanded lung is stiffer. The relative change in blood flow from the apex to the base is greater than the relative change in ventilation, so the ventilation/perfusion ratio is low at the base and high at the apex. The ventilation and perfusion differences from the apex to the base of the lung have usually been attributed to gravity; they tend to disappear in the supine position, and the weight of the lung would be expected to make the intrapleural pressure lower at the base in the upright position. However, the inequalities of ventilation and blood flow in humans were found to persist to a remarkable degree in the weightlessness of space. The reason for this is that at the start of inspiration, intrapleural pressure is less negative at the base than at the apex (Figure 3516), and since the intrapulmonary intrapleural pressure difference is less than at the apex, the lung is less expanded. Conversely, at the apex, the lung is more expanded; that is, the percentage of maximum lung volume is greater. Normally, the volume (in mL) of this anatomic dead space is approximately equal to the body weight in pounds.
A) mean blood pressure B) radius of the resistance vessels C) radius of the capacitance vessels D) central venous pressure E) capillary blood flow 7 blood pressure yoga exercise purchase 10mg amlodipine fast delivery. He is excited because his drug might be of value in the treatment of A) coronary artery disease blood pressure chart heart foundation 2.5 mg amlodipine for sale. Blood cells arise in the bone marrow and are subject to arrhythmia with normal ekg buy 2.5 mg amlodipine with visa regular renewal; the majority of plasma proteins are synthesized by the liver arrhythmia heart beats amlodipine 5mg on line. Fetal hemoglobin is specialized to facilitate diffusion of oxygen from mother to fetus during development. Blood flows from the heart to arteries and arterioles, thence to capillaries, and eventually to venules and veins and back to the heart. Each segment of the vasculature has specific contractile properties and regulatory mechanisms that subserve physiologic function. Physical principles of pressure, wall tension, and vessel caliber govern the flow of blood through each segment of the circulation. Transfer of oxygen and nutrients from the blood to tissues, as well as collection of metabolic wastes, occurs exclusively in the capillary beds. Some is reabsorbed; the remainder enters the lymphatic system, which eventually drains into the subclavian veins to return fluid to the bloodstream. Hypertension is an increase in mean blood pressure that is usually chronic and is common in humans. The majority of hypertension is of unknown cause, but several gene mutations underlie rare forms of the disease and are informative about mechanisms that control the dynamics of the circulatory system and its integration with other organs. Describe how the process of autoregulation contributes to control of vascular caliber. Identify the paracrine factors and hormones that regulate vascular tone, their sources, and their mechanisms of action. These mechanisms increase the blood supply to active tissues and increase or decrease heat loss from the body by redistributing the blood. In the face of challenges such as hemorrhage, they maintain the blood flow to the heart and brain. When the challenge faced is severe, flow to these vital organs is maintained at the expense of the circulation to the rest of the body. Circulatory adjustments are effected by altering the output of the pump (the heart), changing the diameter of the resistance vessels (primarily the arterioles), or altering the amount of blood pooled in the capacitance vessels (the veins). It is also increased in active tissues by locally produced vasodilator metabolites, is affected by substances secreted by the endothelium, and is regulated systemically by circulating vasoactive substances and the nerves that innervate the arterioles. The caliber of the capacitance vessels is also affected by circulating vasoactive substances and by vasomotor nerves. The systemic regulatory mechanisms synergize with the local mechanisms and adjust vascular responses throughout the body. The terms vasoconstriction and vasodilation are generally used to refer to constriction and dilation of the resistance vessels. Changes in the caliber of the veins are referred to specifically as venoconstriction or venodilation. The fibers to the resistance vessels regulate tissue blood flow and arterial pressure. The fibers to the venous capacitance vessels vary the volume of blood "stored" in the veins. The innervation of most veins is sparse, but the splanchnic veins are well innervated. Venoconstriction is produced by stimuli that also activate the vasoconstrictor nerves to the arterioles. In addition to their vasoconstrictor innervation, resistance vessels in skeletal muscles are innervated by vasodilator fibers, which, although they travel with the sympathetic nerves, are cholinergic (sympathetic cholinergic vasodilator system). There is no tonic activity in the vasodilator fibers, but the vasoconstrictor fibers to most vascular beds have some tonic activity. In most tissues, vasodilation is produced by decreasing the rate of tonic discharge in the vasoconstrictor nerves, although in skeletal muscles it can also be produced by activating the sympathetic cholinergic vasodilator system (Table 331).
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