Overall 20mg levitra soft otc erectile dysfunction brands, there has been a The hypothalamic–pituitary–adrenal (HPA) axis is fre- shift from viewing excessive glucocorticoid activity in major quently activated during periods of stress and depression buy levitra soft 20 mg visa bradford erectile dysfunction diabetes service. Challenge with ovine or human forms of hypothalamus, and hippocampus to decrease release of CRH results in blunted ACTH responses in depressives CRH and ACTH. Remission Multiple lines of evidence point to abnormalities of the of episodes appears to be associated with normalization of axis in depression. Initial studies focused on excretion of CRH studies. Postmortem studies have reported that CRH cortisol and its precursors in patients with depression. Acti- mRNA expression was increased (114) and CRH max vation of the axis was also associated with suicidal ideation. Sachar in a classic study reported elevated serum cortisol These data suggest CRH release from the hypothalamus levels over a 24-hour period in severely depressed patients may be associated with a down-regulation of CRH in other (103). Elevations were particularly seen in the evening and brain regions (2). These Imaging studies have reported increased pituitary and data generally were interpreted as indicating that the de- adrenal size during depression, which appear to normalize pressed patient was highly stressed. Increased pituitary size and ele- One method for challenging the axis is to administer the vated CSF CRH levels are associated with DEX nonsuppres- synthetic steroid dexamethasone (DEX) (104). Elevated plasma ACTH levels have been re- pected response is to suppress the axis because the pituitary ported in psychotic depression (119). AVP neurons are increased in the PVN strate a significantly higher nonsuppression rate than do of suicide victims (120) and serum AVP has been reported controls, although the rates of nonsuppression are relatively in one study to be elevated in hospitalized depressives (121). Patients with severe or psychotic CRH is also found in extrahypothalamic brain regions. In- responses and over-activation of these systems may lead to deed, psychosis appears to be the greatest symptom or syn- panic and depression (2). Amygdala CRH has been reported Chapter 72: Molecular and Cellular Mechanisms in Depression 1045 to be under positive (stimulatory) feedback by cortisol and tissue suggestive of an autoimmune thyroiditis, often in the this observation has spurred on much research to develop face of normal T4,T,3 or TSH levels. A recent report on an open label trial suggested CSF TRH was increased in two small studies of depressed that a CRH antagonist might be effective in hospitalized patients as compared to controls (124,125), although not depressives (122). Elevated TRH levels should be ac- Although the literature has emphasized elevated CRH companied by a blunted TSH response to TRH because and cortisol activity in major depression (in part because of TRH levels in the pituitary would be expected to be down- the emphasis on DST nonsuppression), there is emerging regulated in the face of elevated TRH. Indeed, multiple evidence that CRH and cortisol activity may only be ele- studies have reported such blunting in a relatively high per- vated in some subtypes of major depression and that some centage (approximately 25%) of patients with major depres- depressed patients may actually have low HPA activity. A recent review concluded that 41 of 45 studies re- cent data suggest that depressed patients with a history of ported blunted TSH responses to TRH in major depression early abuse (as well as those with psychosis) may be most (127). Blunting of TSH responses to TRH in these patients consistently at risk for demonstrating elevated ACTH levels is not owing to clinical or subclinical hypothyroidism be- in response to social stress (123). Depressives who were not cause thyroid parameters were generally within normal lim- abused as children did not show similar responses. Similarly, low values have been responses to TRH (1). Antithyroid antibodies may be pres- reported in several other types of patients, including atypical ent. Type II hypothyroidism is characterized by normal T3 depression, posttraumatic stress disorder, so-called burn out or T4 levels but otherwise similar abnormalities as in Type syndromes, and so on. Rates of Type III or IV subclinical hypothy- HPA axis activity may be found in specific depressive sub- roidism have been reported to be elevated in depressed pa- types. In many ways this parallels the findings in catechol- tients. These syndromes are both characterized by normal amine activity in depressed patients. First, the DST as we presence of antithyroid antibodies. In one study, depressed use it may not measure cortisol overactivity as much as it patients with high normal thyroid levels were also reported does central CRH overdrive in response to suppressing the to demonstrate exaggerated TSH responses to TRH (128). Second, previous studies have often not with major depression may have subclinical hypothyroid- explored the role of psychosis or early abuse. Indeed, asymptomatic autoimmune thyroiditis with tively few studies on the HPA axis in depression have ex- positive antibodies has been reported to be relatively high plored cortisol activity over the full 24-hour period. Taken together, TSH stimulation test data suggest elevated or decreased TRH activity could be involved in HPT Axis major depression, depending on whether patients met crite- The overlap in symptoms between patients with hypothy- ria for subclinical hypothyroidism. Patients with a history of thyroid yielded intriguing, although at times, conflicting results. One possible explanation which in turn stimulates specific receptors in the pituitary to for the differential effects of T4 and T3 on mood rests with release triiodothyronine (T3) and thyroxine (T4) hormones. Depressed patients have been reported to demon- Activity of the axis can be measured in several ways: strate increased reversed T3 levels in CSF (130), which sug- circulating levels of T3 and T4—both bound and unbound; gests inhibition of the Type II 5′ deiodinase and subsequent TRH levels in the CSF; TSH responses to TRH administra- increased activity of the Type III of the enzyme. Cortisol tion (TRH-stimulation test); and circulating TSH levels. Of interest is a recent report (133) 1046 Neuropsychopharmacology: The Fifth Generation of Progress that in depressed patients low T3 levels predicted earlier tems and their complex interactions in depression. Also, relapse, pointing further to an important role for T3 in research has tended to emphasize cross-sectional rather than mood relation. Future research that Transthyretin levels have been reported to be low in refrac- combines genetic risk factors with longitudinal study of tory depressed patients (134). This may also help explain multiple systems will likely lead to breakthroughs in our possible CNS enhancing effects of T3 in the face of normal understanding of the biology of the disorder. However, there are still a number of seeming contradictions regarding the direc- tion and specific nature of HPT alterations in depression. REFERENCES Data point to both elevations in central TRH activity and subtle forms of hypothyroidism (suggestive of low T3 and 1. Biology of TRH activity) as playing potential roles in major depression. Washington, DC: The Ameri- can Psychiatric Press, 1998:549–588. Growth hormone (GH) is synthesized in the anterior pitui- New York: Oxford University Press, in press. Two hypothalamic hormones, growth hormone releas- 3. The catecholamine hypothesis of affective disor- ders: a review of supporting evidence. Am J Psychiatry 1965; ing factor (GRF) and somatostatin modulate its release from 122:509–522. Somatostatin is also found in extra-hypotha- Arch Gen Psychiatry 1965;13:137–152.
J Abnorm Psychol 1994; be of widespread clinical utility buy levitra soft online from canada erectile dysfunction self injection. Am J Psychia- ber of important issues are unresolved cheapest generic levitra soft uk beer causes erectile dysfunction. BED have disturbances in eating behavior by definition, 14. Ten-year follow-up of 50 patients with bu- and are typically overweight and exhibit symptoms of anxi- limia nervosa. Bulimia nervosa: a 5- ety and depression in clinical samples. Alterations in serotonin it is surprising that the response of these presumably related activity and psychiatric symptomatology after recovery from bu- symptoms to medication is at least somewhat inconsistent, limia nervosa. Outcome, recovery, relapse and mor- tality across six years in patients with clinical eating disorders. A major problem in the develop- Psychiatr Scand 1993;87(6):437–444. L-Dopa as treatment for anorexia ner- response of binge eating to nonspecific interventions, in- vosa. In part for this reason, the effects of medi- Press, 1977:363–372. Treatment of compulsive eating disturbances once medication has been discontinued. Am J Psychol 1974;131: the role of pharmacotherapy for BED currently unresolved, 428–432. The use of diphenylhydantoin in compulsive studies to examine the potential benefits of combining med- eating disorders: further studies in anorexia nervosa. New York: Raven Press, 1977: ication with psychological treatment, especially CBT. Naloxone in the treatment of REFERENCES anorexia nervosa: effect on weight gain and lipolysis. In: Kaplan HI, Freedman AM, noses in anorexia nervosa. Comprehensive textbook of psychiatry, vol 2, 3rd 712–718. A comparative psychometric family therapy in anorexia nervosa and bulimia nervosa. Arch study of anorexia nervosa and obsessive neurosis. Long term follow-up of therapy in the short-term treatment of anorexia nervosa. Neuroleptics in the short-term treatment of vosa in women with obsessive compulsive disorder. Int J Eating anorexia nervosa: a double-blind, placebo controlled study with Dis 1986;5:1069–1075. J Clin Psy- activity in anorexia nervosa after long-term weight restoration. Obsessive-compulsive disorder: psychobiologi- treatment of anorexia nervosa. Int J Eating Dis 2000;27(3): cal approaches to diagnosis, treatment, and pathophysiology. Antiserotonin-antihista- 9-tetrahydrocannabinol in primary anorexia nervosa. J Pharmacol Exp Ther 1961; chopharmacol 1983;3:165–171. Cyproheptatadine in an- crossover study of oral clonidine in acute anorexia nervosa. Biol Psychiatry 2001;49(7): cisapride accelerates delayed gastric emptying and increases antral 644–652. Does fluoxetine augment the Garner DM, Garfinkel PE, eds. Diagnostic issues in anorexia ner- inpatient treatment of anorexia nervosa? Effects of carbohydrate depressive illness: a review of 11 studies. Comp Psychiatry 1988; and protein meals on plasma large neutral amino acids, glucose 29:427–432. Am J Psychol weight subjects normalize after weight gain. Amitriptyline in the increases serotonin transporter (SERT) binding sites and SERT treatment of anorexia nervosa: a double-blind placebo-controlled mRNA expression in discrete regions of female rat brain. In: Schatz- trial of lithium carbonate in primary anorexia nervosa. Washington, monoamine metabolism in anorexia nervosa. Arch Gen Psychiatry DC: American Psychiatric Press, 1993:49–70. Personality and symptomatological features in young, 68. Relationship of depres- nonchronic anorexia nervosa patients. J Psychosom Res 1980;24: sion, anxiety, and obsessionality to state of illness in anorexia 353–359. Practice guideline for the treat- ship of eating disorders to major affective disorder. Psychiatry Res ment of patients with eating disorders (revision). Chapter 116: Psychopharmacology of Eating Disorders 1683 70. Intensive nutritional bulimia nervosa, and binge eating. In: Bloom FE, Kupfer DJ, counseling in bulimia nervosa: a role for supplementation with eds. Psychopharmacology: the fourth generation of progress. Flouxetine Bulimia Nervosa Collaborative Study Group. Fluoxe- pharmacological treatments of bulimia nervosa: predictors and tine in the treatment of bulimia nervosa: a multicenter, placebo- processes of change. A double-blind, placebo- treatment of bulimia nervosa. Pharmacologic and treatment of obese binge eaters and non-binge eaters. Am J Psy- cognitive-behavioral treatment for bulimia nervosa: a controlled chiatry 1990;147:876–881.
Psychosocial etiological factors Child abuse and neglect is universally accepted as a powerful etiological factor in some cases of depressive disorders order levitra soft 20 mg erectile dysfunction drugs list, and in those cases in which it is a feature generic 20 mg levitra soft with amex erectile dysfunction treatment with fruits, the prognosis is much less favourable (Nemeroff, 2016). Other risk factors include neurotic personality traits, low self-esteem, early onset anxiety, a history of conduct disorder, substance misuse, adversity, interpersonal difficulties, low education, lifetime trauma, low social support, divorce and stressful life events (Kendler, et al, 2006). Pathophysiology The pathophysiology of MDD is uncertain. A host of pathophysiological observations and theories can be listed. Last modified: November, 2017 7 However, in recent years, some ideas and observations have been reported which been replicated and clearly represent part of the answer. This implies white matter abnormalities cause isolation or dysfunction. Abnormalities in the connectivity within these networks of the connectivity between the structures of these networks may explain many of the symptoms of depression (see Table) (Liston et al, 2014; Anderson et al, 2016); Avissar et al, 2017). Default mode net Central executive Salience net net Some structures Dorsal and ventral Dorsolateral Anterior cingulate medial prefrontal prefrontal cortex, cortex, insular cortex; posterior posterior parietal cortex, amygdala, cingulate, cortex, thalamus ventral tegmental hippocampus area Healthy function Active when not Cognitively Detects personally focused on the demanding tasks, salient and outside world. Structural connectivity refers to anatomical links ("anatomical connectivity"). Functional connectivity refers to statistical dependencies. Structural connectivity is often assessed using MRI diffusion weighted imaging (DWI), which provides some information about the underlying microstructure of white matter. Functional connectivity looks at the correlation of physiological events in connected parts of the brain – and can be measured using techniques other than imaging [i. Successful treatment of depression is associated with correction of these connectivity abnormalities: general medical care (Taylor et al, 2011), Psychotherapy (Crowther et Pridmore S. Last modified: November, 2017 8 al, 2015), ECT (Lyden et al, 2014), TMS (Kozel et al, 2011), and antidepressant medication (Li et al, 2013). Earlier neuroimaging White matter hyperintensities (or white matter lesions) are discrete regions which appear brighter on T2-weighted MRI scans (reflecting a localized change in water content in that tissue). While hyperintensities are associated with increasing vascular disease and age, they have a clear association with major depressive disorder and bipolar depression (Videbech, 1997). A longitudinal study demonstrated that white matter changes pre-date, and may be causally related to depressive symptoms (Teodorczuk et al, 2007). MRI studies in MDD have demonstrated reduction in hippocampal size (Campbell et al 2004; Saylam et al, 2006). Anterior cingulate cortex (ACC) has received much imaging attention. An ACC based neural network (including various other areas of prefrontal cortex, amygdala, hippocampus, striatum and thalamus) may have a central role in mood disorders (Drevets and Savitz, 2008; Sexton et al, 2013). ACC grey matter reduction, blood flow and metabolism alterations and glial cell reduction have been reported. In a meta-analysis of magnetic resonance spectroscopy (MRS) studies, the ACC of people with MDD, has been found to contain low concentrations of glutamate and glutamine during depressive episodes (Luykx et al, 2011). Other pathophysiological/aetiological factors Warning – learning this may be dangerous to your mental health. A vast number of other for biological mechanisms have been suggested, including: • neurotransmitters: serotonin, norepinephrine, dopamine, glutamate acetylcholine and GABA somatostatin, corticotrophin and substance P. Multiple theories link various biological mechanisms: • Gut bacteria (microbiota) impacting on the the vagus nerve and immune system. Last modified: November, 2017 9 • inflammatory mediators (IL-1, IL-6, TNF-alpha, CRP), the endocrine system and neurotransmitters (Becking et al, 2015; Muneeer, 2015; Bhattacharya et al, 2016). A multitude of genes with small effect are likely to be involved, which interact with environmental factors. Post-mortem studies In a post-mortem study of anterior cingulate cortex (ACC) in mood disorder, although layer thickness was unchanged, there was decreased density of glial cells across all layers. The density of pyramidal neurons and the shapes of neurons differed in some layers (Gittins and Harrison, 2011). Cognition In acute MDD, 63% of people have cognitive difficulties (compared to 3. Attention/concentration is the domain most commonly affected, followed by memory disturbance. Treatment The etiological approach of McHugh (2005) assists in treatment. Cognitive behaviour therapy (CBT) is a form of psychotherapy which may be effective in mild/moderate depression (Cuijpers et al, 2010). The theoretical basis of CBT is that depressive symptoms arise from dysfunctional beliefs and thought processes which are the results of past experience and learning. The aim of CBT is to identify these negative thoughts and replace them with informed and logical thinking habits. According to some (Karyotaki et al, 2016) psychotherapy is as effective as medication in the acute phase and superior to medication in the long term. According to these authors combining psychotherapy and medication provides no benefits. However, the efficacy of current antidepressants is disappointing (Rush et al, 2006; Bschor and Kilarski 2016). Last modified: November, 2017 10 Chapter 16 (Antidepressant drugs) also provides additional information. Selective serotonin reuptake inhibitors (SSRIs), which increase the concentration of serotonin in the synaptic cleft (fluoxetine, paroxetine, fluvoxamine, citalopram and sertraline), are the most widely used. Dual action agents increase availability of both serotonin and norepinephrine (venlafaxine and mirtazapine, among others) are perhaps more potent than the SSRIs. Agomelatine has some SSRI activity but is also novel in being an agonist of melatonin receptors. Evidence suggests an antidepressant action (Taylor et al, 2014) – but, its usefulness has been challenged (Urade et al, 2015; Yatham et al, 2016). Minocycline which has some anti-inflammatory action, has been demonstrated to have some antidepressant action (Rosenblat and McIntyre, 2017a) – consistent with the idea that MDD may be underpinned by an excessive immune response. Older medications include the tricyclic antidepressants (TCAs) and monoamine oxidase inhibitors (MAOIs) are less commonly used at the current time, because they have more side-effects and present a greater risk in overdose. However, they are effective and continue to be used by some specialist practitioners. In recent years, the NMDAR antagonist, ketamine, has been administered intravenously for rapid remission of MDD, which has not been responsive to other treatments (Duman and Aghajanian, 2012; Wohleb et al, 2016). Non-drug, physical treatments of unremitting depression include electroconvulsive therapy (ECT) and transcranial magnetic stimulation (TMS) – see Chapters 28 & 29. BIPOLAR DEPRESSED PHASE Much of what appears under the heading of MDD also applies in bipolar depression. The elevated phases of bipolar disorder is discussed in greater depth in Chapter 9. Over recent years, authorities have argued that it is important to distinguish MDD from bipolar depression, because the treatment of bipolar depression may precipitate an episode of mania (Post, 2006).
Infantile autism: a genetic study of 21 in the pericentromeric region of human chromosome 15q con- twin pairs cheap levitra soft 20 mg without a prescription erectile dysfunction drugs at walmart. Cognitive deficits in parents from multiple- facial syndrome levitra soft 20 mg without a prescription impotence exercises. Velocardiofacial manifes- ents of children with autism. Identical triplets with infantile autism and the frag- Dev Med Child Neurol 2000;42:133–142. Molecular and cellular genetics of children with specific language impairment. Association of devel- of the fragile X syndrome in infantile autism. A Swedish multi- opmental language impairment with loci at 7q3. The prevalence of fragile X in a sample of autistic individuals diagnosed using a standardized 114. Prevalence of the fragile X Nature Genet 1999;18:168–170. Medical conditions associated with study of monozygotic twins. New York: Wiley, 1997: tal measurement in treatment-naive children with obsessive- 388–410. A family history study of children at high risk for fragile X syndrome utilizing buccal cell neuropsychiatric disorders in the adult siblings of autistic indi- FMR-1 testing. Y receptor homolog modifies social behavior and food response 96. Biology of the fragile X mental retardation pro- autism: is there a connection? Structural and functional tuberous sclerosis estimated by capture-recapture analysis. Lan- characterization of the human FMR1 promoter reveals similari- cet 1998;351:1490. Chapter 41: The Molecular and Cellular Genetics of Autism 563 122. Nat Biotechnol 1998; of the tuberous sclerosis complex. Electrophoresis 1999;20: ization of the cytosolic tuberin-hamartin complex. Large-scale gene expression data analysis: a new 35647–35652. Absence of linkage and correlations in 150 families with tuberous sclerosis. AmJHum linkage disequilibrium to chromosome 15q11-q13 markers in Genet 1999;64:1305–1315. Strong association of Autism Dev Disord 1999;29:195–201. Depressed lymphocyte responsive- Am J Hum Genet 1998;62:1077–1083. Immune abnor- mosome 10 and pseudogene (HTR7P)to chromosome 12, and malities in patients with autism. J Autism Dev Disord 1986;16: testing of linkage disequilibrium between HTR7 and autistic 189–197. Veenstra-VanderWeele J, Gonen D, Leventhal BL, et al. Possible association of clinical approach and association study with two markers of the extended MHC haplotype B44-SC30-DR4 with autism. Increased frequency Ras gene in psychiatric disorders. Immunogenetic stud- phism in autism, Tourette syndrome, or ADHD. Biol Psychiatry ies in autism and related disorders. An extreme-sib-pair ge- two markers of a human homeogene in infantile autism. J Med nome scan for genes regulating blood pressure. Extreme discordant sib pairs for mapping three genetic markers of brain growth factors and infantile au- quantitative trait loci in humans. MCDOUGLE DIAGNOSIS OF PERVASIVE repertoire of activity and interests. The clinical presentation DEVELOPMENTAL DISORDERS of the disorder varies significantly depending on the devel- opmental level and chronologic age of the individual. The qualitative impairments that social communication, or in symbolic or imaginative play define these disorders are abnormal relative to the individu- prior to the age of 3 years. These conditions are clearly normal development, although 1 or 2 years of rela- typically evident in the first 1 to 3 years of life and are tively normal progression can occur. In some instances, usually associated with some degree of mental retardation. If there is a period of abnormalities, congenital infections, structural abnormali- normal development, it cannot extend past the age of 3 ties of the brain). In the majority of cases, however, a specific years. Previously, terms like psychosis In approximately 75% of cases, there is an associated and childhood schizophrenia were used to refer to individuals diagnosis of mental retardation, commonly in the moderate with these conditions. However, there is now considerable range (IQ 35 to 50). A number of behavioral symptoms, evidence to demonstrate that PDDs are distinct from schiz- including hyperactivity; inattention; impulsivity; aggression ophrenia. There are five subtypes of PDD in the Diagnostic toward self, others, or property; and interfering repetitive and Statistical Manual of Mental Disorders, fourth edition thoughts and behavior are often present. Seizures may develop, particularly in ado- lescence, in up to 25% to 33% of cases. The disorder is four to five times more common in males than in females, Autistic Disorder although females often have a more severe cognitive disabil- The essential features of autistic disorder are the presence ity. Epidemiologic studies have identified rates of autistic of markedly abnormal or impaired development in social disorder of two to five cases per 10,000.