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By: Andrew D Bersten, MB, BS, MD, FANZCA, FJFICM
- Department of Critical Care Medicine, Flinders Medical Centre and School of Medicine, Flinders University, Adelaide, Australia
In addition medications pancreatitis order donepezil 5mg online, some cases of diabetes are due to symptoms quitting weed order 10 mg donepezil visa other diseases or conditions such as chronic pancreatitis medicine 54 357 buy donepezil 5mg otc, total pancreatectomy everlast my medicine cheap donepezil 5 mg with amex, Cushing syndrome (see Chapter 22), and acromegaly (see Chapter 24). These make up 5% of the total cases and are sometimes classified as secondary diabetes. Type 1 diabetes usually develops before the age of 40 and hence is called juvenile diabetes. Patients with this disease are not obese and they have a high incidence of ketosis and acidosis. Various anti-B cell antibodies are present in plasma, but the current thinking is that type 1 diabetes is primarily a T lymphocyte-mediated disease. Definite genetic susceptibility is present as well; if one identical twin develops the disease, the chances are 1 in 3 that the other twin will also do so. The main genetic abnormality is in the major histocompatibility complex on chromosome 6, making individuals with certain types of histocompatibility antigens (see Chapter 3) much more prone to develop the disease. Immunosuppression with drugs such as cyclosporine ameliorate type 1 diabetes if given early in the disease before all B cells are lost. Attempts have been made to treat type 1 diabetes by transplanting pancreatic tissue or isolated islet cells, but results to date have been poor, largely because B cells are easily damaged and it is difficult to transplant enough of them to normalize glucose responses. As mentioned above, type 2 is the most common type of diabetes and is usually associated with obesity. It usually develops after age 40 and is not associated with total loss of the ability to secrete insulin. It has an insidious onset, is rarely associated with ketosis, and is usually associated with normal B cell morphology and insulin content if the B cells have not become exhausted. The genetic component in type 2 diabetes is actually stronger than the genetic component in type 1 diabetes; in identical twins, the concordance rate is higher, ranging in some studies to nearly 100%. They include defects in glucokinase (about 1% of the cases), the insulin molecule itself (about 0. It deserves additional consideration in this chapter because of its special relation to disordered carbohydrate metabolism and diabetes. As body weight increases, insulin resistance increases, that is, there is a decreased ability of insulin to move glucose into fat and muscle and to shut off glucose release from the liver. This combination of findings is commonly called the metabolic syndrome, or syndrome X. Some of the patients with the syndrome are prediabetic, whereas others have type 2 diabetes. It has not been proved but it is logical to assume that the hyperinsulinemia is a compensatory response to the increased insulin resistance and that frank diabetes develops in individuals with reduced B cell reserves. These observations and other data strongly suggest that fat produces a chemical signal or signals that act on muscles and the liver to increase insulin resistance. Evidence for this includes the recent observation that when glucose transporters are selectively knocked out in adipose tissue, there is an associated decrease in glucose transport in muscle in vivo, but when the muscles of those animals are tested in vitro their transport is normal. One possible signal is the circulating free fatty acid level, which is elevated in many insulin-resistant states. It is now clear that white fat depots are not inert lumps but are actually endocrine tissues that secrete not only leptin but also other hormones that affect fat metabolism. Leptin and adiponectin, for example, decrease insulin resistance, whereas resistin increases insulin resistance. Further complicating the situation, marked insulin resistance is present in the rare metabolic disease congenital lipodystrophy, in which fat depots fail to develop. It is unclear how, or indeed if, these findings fit together to provide an explanation of the relation of obesity to insulin tolerance, but the topic is obviously an important one and it is under intensive investigation. In liver it induces glucokinase, which increases the phosphorylation of glucose, facilitating the entry of glucose into the cell. Insulin causes K+ to enter cells, with a resultant lowering of the extracellular K+ concentration. Insulin receptors are found on many different cells in the body and have two subunits, and. Binding of insulin to its receptor triggers a signaling pathway that involves autophosphorylation of the subunits on tyrosine residues. This triggers phosphorylation of some cytoplasmic proteins and dephosphorylation of others, mostly on serine and threonine residues. The constellation of abnormalities caused by insulin deficiency is called diabetes mellitus.
The membrane potential moves toward the equilibrium potential for Na+ (+60 mV) but does not reach it during the action potential symptoms colon cancer order donepezil 10 mg on-line, primarily because the increase in Na+ conductance is short-lived medications diabetic neuropathy buy donepezil 5 mg without a prescription. The Na+ channels rapidly enter a closed state called the inactivated state and remain in this state for a few milliseconds before returning to medicine definition discount 10mg donepezil free shipping the resting state translational medicine purchase donepezil 5 mg with visa, when they again can be activated. In addition, the direction of the electrical gradient for Na+ is reversed during the overshoot because the membrane potential is reversed, and this limits Na+ influx. A third factor producing repolarization is the opening of voltage-gated K+ channels. This opening is slower and more prolonged than the opening of the Na+ channels, and consequently, much of the increase in K+ conductance comes after the increase in Na+ conductance. The net movement of positive charge out of the cell due to K+ efflux at this time helps complete the process of repolarization. The slow return of the K+ channels to the closed state also explains the after-hyperpolarization, followed by a return to the resting membrane potential. Thus, voltage-gated K+ channels bring the action potential to an end and cause closure of their gates through a negative feedback process. Figure 47 shows the sequential feedback control in voltagegated K+ and Na+ channels during the action potential. Decreasing the external Na+ concentration reduces the size of the action potential but has little effect on the resting membrane potential. The lack of much effect on the resting membrane potential would be predicted, since the permeability of the membrane to Na+ at rest is relatively low. Conversely, increasing the external K+ concentration decreases the resting membrane potential. Although Na+ enters the nerve cell and K+ leaves it during the action potential, the number of ions involved is minute relative to the total numbers present. The fact that the nerve gains Na+ and loses K+ during activity has been demonstrated experimentally, but significant differences in ion concentrations can be measured only after prolonged, repeated stimulation. Other ions, notably Ca2+, can affect the membrane potential through both channel movement and membrane interactions. A decrease in extracellular Ca2+ concentration increases the excitability of nerve and muscle cells by decreasing the amount of depolarization necessary to initiate the changes in the Na+ and K+ conductance that produce the action potential. Conversely, an increase in extracellular Ca2+ concentration can stabilize the membrane by decreasing excitability. Voltage-gated Na+ channels are highly concentrated in the nodes of Ranvier and the initial segment in myelinated neurons. The initial segment and, in sensory neurons, the first node of Ranvier are the sites where impulses are normally generated, and the other nodes of Ranvier are the sites to which the impulses jump during saltatory conduction. The number of Na+ channels per square micrometer of membrane in myelinated mammalian neurons has been estimated to be 5075 in the cell body, 350500 in the initial segment, less than 25 on the surface of the myelin, 200012,000 at the nodes of Ranvier, and 2075 at the axon terminals. In many myelinated neurons, the Na+ channels are flanked by K+ channels that are involved in repolarization. The threshold intensity varies with the duration; with weak stimuli it is long, and with strong stimuli it is short. The relation between the strength and the duration of a threshold stimulus is called the strengthduration curve. Slowly rising currents fail to fire the nerve because the nerve adapts to the applied stimulus, a process called adaptation. Further increases in the intensity of a stimulus produce no increment or other change in the action potential as long as the other experimental conditions remain constant. The action potential fails to occur if the stimulus is subthreshold in magnitude, and it occurs with constant amplitude and form regardless of the strength of the stimulus if the stimulus is at or above threshold intensity. The action potential is therefore "all or none" in character and is said to obey the all-or-none law. The magnitude of this response drops off rapidly as the distance between the stimulating and recording electrodes is increased.
There are two mechanisms by which this condition can cause a paroxysmal tachycardia: 1 medications without a script effective donepezil 5 mg. Supraventricular Tachycardias All impulses get through to medicine vs surgery donepezil 10 mg mastercard the ventricle in this condition medicine uses donepezil 10mg with mastercard, whereas in normal circumstances only one Atrial impulse gets through medications information cheap 10mg donepezil with mastercard. Orthodromic Reciprocation Tachycardia creates a re-entry loop that causes multiple depolarizations of the atria. Common causes of sinus bradycardia are: Ischemia, Increased Vagal Tone, Anti-arrhythmics ** Patients are usually symptomatic and may present with only fatigue ** Atropine will block vagal stimulation and thus elevate the sinus rate. Pressure of all chambers, the pulmonary artery, and pericardium are equal in pressure, thus ventricular filling is impaired. The progression to a heart disease is an immune-mediated process, not a result of the bacterial infection. Acute Endocarditis Caused by Staph Aureus and creates large vegetations on a previously healthy/normal valve. Subacute Endocarditis Caused by Viridians group Strep and creates small vegetations on an abnormal/diseased valve. The most commonly encountered types of emboli are: Fat (due to long bone breaks and liposuction), Air (can occur as a result of injection of air into the circulatory system), Thrombus (breaks of from a deep vein thrombosus), Amniotic Fluid (from pregnancy complications). Squamous Cell Carcinoma: Is a very common form of skin cancer, and is associated with excess exposure to sunlight. Basal Cell Carcinoma: Presents as "pearly papules", and is most commonly seen in sun-exposed areas of the body. There is a direct correlation between the depth of the lesion and the degree of metastasis. Astrocytoma this type of brain cancer is usually found in the posterior fossa, and it comes with a good prognosis. Medulloblastoma this can cause hydrocephalus as it often presses on the fourth ventricle. Ependymoma Usually found in the fourth ventricle, it derives from ependymal cells and can also cause hydrocephalus due to its location. It is usually cerebellar, but can be associated with a retinal angioma (which gives it an association to Von Hippel Lindau syndrome) Craniopharyngioma Is a supratentorial tumor that is benign and often confused with a pituitary adenoma. Astrocytoma Medulloblastoma Ependymoma Hemangioma Craniopharyngioma Adulthood brain cancers: Pituitary adenoma Most commonly as prolactin-secreting form, the most common presentation is bitemporal hemianopsia. Glioblastoma Multiforme Is the most common primary brain tumor, has a terrible prognosis. Oligodendroglioma Is a slow growing and rare tumor, seen usually in the frontal lobe of the brain. Schwannoma Is the 3rd most common adult brain tumor, originating from Schwann cells. Is likely to metastasize early, and has the characteristic `onion skinning on xray. Chondrosarcoma A malignant tumor of cartilaginous bone, seen in males >30yr of age. Lung cancer can cause a wide array of symptoms (aside from cough, hemoptysis, wheezing, bronchial obstruction). Chronic Bronchitis: this condition is characterized by the presence of a productive cough for at least 3 consecutive months for 2 or more years. There is a hypertrophy of the mucus-secreting glands of the bronchioles, giving a Reid index of > 50%. Bronchioalveolar Carcinoma this is the lung cancer that is not thought to be related to smoking 2. Emphysema: this condition results in a destruction of alveolar recoil resulting in the enlargement of air spaces due to smoking and/or an 1- antitrypsin deficiency (causes increase in elastase activity). Asthma: this results in constriction of the bronchioles due to hyperresponsiveness. Bronchiectasis: A condition that results in dilated airways, recurrent infections, hemoptysis, and purulent sputum.
Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality treatment ibs order 5 mg donepezil mastercard. Prospective association of smoking and alcohol use with cognitive function in an elderly cohort symptoms adhd cheap donepezil 10 mg with amex. Alcohol consumption and cognitive function in late life: a longitudinal community study medications not to take when pregnant generic 10mg donepezil fast delivery. Plasma homocysteine and cognitive impariment in an older British African-Caribbean population symptoms 14 days after iui buy donepezil 10 mg free shipping. Minimal hippocampal width relates to plasma homocysteine in community-dwelling older people. Serum folate and the severity of atrophy of the neocortex in Alzheimer disease: findings from the Nun Study. Serum vitamin B12 levels and incidence of dementia in a healthy elderly population: a report from the Bronx Longitudinal Aging Study. Improvement of cognitive functions after cobalamin/folate supplementation in elderly patients with dementia and elevated plasma homocysteine. Randomized trial of the effect of supplementation on the cognitive function of older people with subnormal cobalamin levels. Vitamin B12 deficiency in dementia and cognitive impairment: the effects of treatment on neuropsychological function. Failure to find a relationship between mnestic skills of octogenarians and aluminum in drinking water. Disturbance of cerebral function by aluminum in haemodialysis patients without overt aluminum toxicity. Depression has biological underpinnings that medical 373 374 Geriatric Nutrition research has been unraveling in the past few decades, in addition to its psychosocial bases. Several neurotransmitters and brain regions are implicated in mood regulation and control of emotional behavior. Involvement of the hypothalamus, the basal ganglia, and the limbic system in depression is supported by biological research and symptoms of mood disorders. The neurobiogenic inputs to these structures play a significant role in mood regulation and the pathogenesis of depression. Its neurons are projected upward through the forebrain to the cerebral cortex, limbic system, thalamus, and hippocampus. Norepinephrine is a key neurotransmitter involved in the control of mood and emotional behavior. Serotonin is another key neurotransmitter that is involved in the control of mood. The axons of serotonergic neurons originate in the raphe nuclei of the brain stem and project to the cerebral cortex, limbic system, cerebellum, and spinal cord. Serotonin is involved in the regulation of pain, pleasure, anxiety, panic, arousal, and sleep behavior. The typical stooped posture, motor slowness, and minor cognitive impairment often seen with late-life depression are thought to be related to the involvement of the basal ganglia. Dysregulation of multiple neuroendocrine pathways has been reported in depression. While adrenal and thyroid abnormalities are well studied, abnormalities in growth hormone, testosterone (in men), somatostatin, and prolactine malfunction may also be implicated in depression. The correlation between hypersecretion of cortisol and depression is well established, and 5 to 10% of people with depression are diagnosed with thyroid problems. Serotonin is produced from the dietary amino acids tryptophan and 5-hydroxy tryptophan, while norepinephrine is synthesized from the dietary amino acids tyrosine and phenylalanine. The synthesis of both serotonin and norepinephrine requires vitamins B, C, folic acid, and essential minerals, including zinc, magnesium, manganese, iron, and copper. Depletion of these nutrients has been shown to potentially worsen or induce depression. Omega-3 fatty acids, crucial components of synaptic cell membranes, maintain the stability of serotonin receptors and their functions and have been shown to have a mood-stabilizing and antidepressant effect in unipolar and bipolar depression. Replacement of deficient nutrients and healthy eating habits are associated with faster response to depression treatment, longer periods of remission, and can be the key for effective treatment of depression where they are the primary cause. Depression can cause or worsen nutritional problems, and nutritionally compromised patients are prone to depression because of the intricate link between the depression and nutrition.
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