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Since amino acids obtained from dietary sources are the precursors of mood-regulating neurotransmitters such as serotonin and dopamine Cheap Nike Air Max Womens , amino acids are considered to hold potential in treatingdepression. Neurotransmitter precursors are the subject of ongoing research.So why is this topic relevant to primary care medicine? Patients have taken matters into their ownhands. Patients are self-treating their depression with amino acid supplements and appear to be motivated by a perceived benefi t in their mood and overall health. The amino acid precursors tryptophan,tyrosine, 5-hydroxytryptophan, and L-dopa are readily available as supplements at doses that exceed feasible dietary intake. Amino acids supplements have less potential for harm and larger therapeuticeffect when their use is physician-guided.This chapter presents the bundle damage theory of depression to probe the biologic basis of amino acid therapy. It offers primary care physicians a treatment protocol that implements laboratory testing toguide dosing; explains the potential side effects and how these can be minimized; offers quality regulation in product selection; and presents a protocol for simultaneous use of medication and nutrients inthe treatment of clinical depression.II. EPIDEMIOLOGYDepression is a global problem. The World Health Organization notes:32 Nearly 5锟?0% of persons in a community at a given time are in need of help for depression. As muchas 8锟?0% of persons carry the risk of developing depression during their lifetime. The average age of the onset for major depression is between 20 and 40 years. Women have higher rates of depression thanmen. Race or ethnicity does not infl uence the prevalence of depression. World wide depression is the fourth leading cause of disease burden, accounting for 4.4% of total Disability-Adjusted Life-Years(DALYs) in the year 2000. It causes the largest amount of non-fatal burden. Disability from depression world wide is increasing. In 1990 Nike Air Max Womens Outlet , the total years lived with disability (YLD) was 10.7%. By 2000, theYLD had increased to 12.1% worldwide.33 Mental health conditions have a tendency to move upwards in ranking, while ranked as the fourth leading cause of disease burden in 2000, it is expected thatdepression will move to second place by 2020, second only to heart disease.34 Population surveys suggest that while the incidence of depression is higher in the developedcountries of North America and Europe than in other regions Nike Air Max Womens Sale , it is nonetheless a common condition throughout the world.38 The rate difference is often attributed to underdiagnosis, but newer datasuggest that the Western diet, stressful lifestyle, and higher toxicant exposures contribute to the prevailing high rates in Westernized countries.32The monoamine theory fails to explain why the incidences of depression are increasing on a worldwide basis and is more prevalent in developed countriesIII. PATHOPHYSIOLOGYThe monoamine theoryThe monoamine theory of depression has long been the major framework against which the treatment of depression has been examined and developed due to the fact that the theory attempts toprovide a pathophysiologic explanation for depression and the actions of antidepressants. The central premise of the monoamine theory states that it may be possible to restore normal function indepressed patients by targeting the catecholamine andor serotonin systems with antidepressants.This theory is based on evidence that depression symptoms can be improved by administeringcompounds that are capable of increasing monoamine concentrations in the nerve synapses. Early research focused on defi cits in the catecholamine system with specifi c emphasis on noradrenalinas a potential cause for depression. With further research, the theory was expanded to include the serotonin system as a cause for depression. This research has led to the use of drugs for treatment ofdepression that affect changes in monoamine uptake and enzymatic metabolism.1 While many of the depression treatments based on the monoamine theory appear to be initiallyuseful Nike Air Max Womens Shoes , many of them lack the short-term and long-term effi cacy needed for relief of symptoms in most patients. In several studies of reuptake inhibitors administered, only 8% to 13% of subjectsobtained relief of symptoms greater than placebo. Remission rates for escitalopram compared to placebo in adults was studied (48.7% vs. 37.6%, P = 0.003). Here, 11.1% of subjects obtained reliefgreater than placebo.35 Remission rates for citalopram versus placebo in another study were studied (52.8% vs. 43.5%, P = 0.003). Here Nike Air Max Womens , 9.4% of patients obtained relief greater than placebo.35Venlafaxine-XR was similar to escitralopram and citalopram (P = 0.03).35 Treatment of the elderly in the primary care setting under the monoamine theory reveals no reliefof symptoms versus placebo. In the elderly (79.6 years, SD = 4.4, N = 174), it was concluded that citalopram, 锟絯as not more effective than placebo for the treatment of depression.锟?7 In treatment ofdepression in patients over 60 years of age with a mean age of 68 years Cheap Air Max Womens , scitalopram treatment was not signifi cantly different from placebo treatment锟?(N = 264).29Depression treatment of children and adolescents ages 7 to 17 (N = 174) with citalopram, under a double-blind 20 mgday, 40 mgday option, found 24% of patients treated with placebo showedimprovement versus 36% of patients taking citalopram.28 Other studies of other reuptake inhibitors revealed similar results.50锟?5 Reuptake inhibitors are effective in treating other disorders than those for which they were initiallydeveloped, such as obesity Air Max Womens Outlet , panic disorder, anxiety, migraine headaches, ADHDADD, premenstrual syndrome Air Max Womens Sale , dementia, fi bromyalgia, psychotic illness, insomnia, obsessive-compulsivedisorder Air Max Womens Shoes , and bulimiaanorexia; yet not all drugs that increase serotonin or catecholamine transmission are effective when treating depression.1Treatment with reuptake inhibitors is based on the monoamine t . 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