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1.
Adv Exp Med Biol ; 1191: 219-235, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002932

RESUMO

Although anxiety and depression have been considered as two distinct entities according to the diagnostic criteria, anxious depression (comorbid anxiety and depression) is relatively a common syndrome. According to the DSM-5 criteria, it uses "with anxious distress specifier" to define anxious depression in its MDD section. Anxious depression is known to have different neurobiological profiles compared to non-anxious depression. Several studies have revealed significant differences between anxious depression and non-anxious depression regarding the hypothalamic-pituitary-adrenal (HPA) axis function, structural and functional brain imaging findings, inflammation markers, etc. Patients with anxious depression were significantly more likely to be found in primary care setting and more likely to be associated with female gender, non-single, unemployed, less educated, and more severe depression. Previous reports also showed that patients with anxious depression had more frequent episodes of major depression and a higher risk of suicidal ideation and previous suicide attempts than those with non-anxious depression. Although anxious depression is known to be associated with poor treatment outcomes in several studies, recent researches have sought to find better treatment strategy to improve patients with anxious depression.


Assuntos
Transtornos de Ansiedade/complicações , Transtornos de Ansiedade/terapia , Transtorno Depressivo Maior/complicações , Transtorno Depressivo Maior/terapia , Ansiedade/complicações , Ansiedade/diagnóstico , Ansiedade/terapia , Transtornos de Ansiedade/diagnóstico , Comorbidade , Depressão/complicações , Depressão/diagnóstico , Depressão/terapia , Transtorno Depressivo Maior/diagnóstico , Humanos
2.
Adv Exp Med Biol ; 1191: 265-289, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002934

RESUMO

Biofeedback refers to the operant training of physiological responding. Variants include electromyography (EMG), electrodermal activity (EDA), skin temperature, heart rate (HR) and heart rate variability (HRV), respiratory biofeedback of end-tidal CO2 (ETCO2), electroencephalography (EEG) signal, and blood oxygen-level dependent signal using functional magnetic resonance imaging (fMRI). This chapter presents a qualitative and quantitative systematic review of randomized controlled trials of biofeedback for anxiety disorders as defined by the 3rd through 5th editions of the Diagnostic and Statistical Manual of Mental Disorders (DSM). Meta-analytic results indicated that biofeedback (broadly defined) is superior to wait list, but has not been shown to be superior to active treatment conditions or to conditions in which patients are trained to change their physiological responding in a countertherapeutic direction. Thus, although biofeedback appears generally efficacious for anxiety disorders, the specific effects of biofeedback cannot be distinguished from nonspecific effects of treatment. Further, significant limitations were identified in the existing literature, with the majority receiving a "weak" rating according to Effective Public Health Practice Project (EPHPP) rating system guidelines. Future directions for research are discussed.


Assuntos
Transtornos de Ansiedade/terapia , Biorretroalimentação Psicológica , Neurorretroalimentação , Eletroencefalografia , Eletromiografia , Frequência Cardíaca , Humanos , Temperatura Cutânea
3.
Adv Exp Med Biol ; 1191: 291-329, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002935

RESUMO

Anxiety disorders are an enormous societal burden given their high lifetime prevalence among adult populations worldwide. A variety of anxiety disorders can be successfully treated with psychological treatments such as cognitive behavioral therapy (CBT), mindfulness-based cognitive therapy (MBCT), and acceptance and commitment therapy (ACT), either as stand-alone individual or group treatment or as adjunctive treatment to pharmacotherapy. Furthermore, a growing body of evidence suggests that therapist-guided Internet-delivered CBT (iCBT) and, to some degree, digitalized mindfulness- and acceptance-based interventions may be an efficacious complement to traditional face-to-face therapy. In view of the current advances regarding the integration of traditional and innovative treatment approaches, this chapter provides an overview on the theory and evidence base for different delivery modes of CBT-related interventions for specific phobia, panic disorder, agoraphobia, social anxiety disorder, and generalized anxiety disorder in adults. Finally, implications for clinical practice and research will be derived, and future directions for the psychological treatment of anxiety disorders will be outlined.


Assuntos
Terapia de Aceitação e Compromisso , Transtornos de Ansiedade/psicologia , Transtornos de Ansiedade/terapia , Terapia Cognitivo-Comportamental , Atenção Plena , Humanos , Transtornos Fóbicos/psicologia , Transtornos Fóbicos/terapia , Resultado do Tratamento
4.
Adv Exp Med Biol ; 1191: 347-365, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002937

RESUMO

Anxiety disorders, including panic disorder/agoraphobia (PDA), generalized anxiety disorder (GAD), social anxiety disorder (SAD), and others, are the most prevalent mental disorders. In this paper, recommendations are given for the psychopharmacological treatment of these disorders which are based on comprehensive treatment guidelines, meta-analyses, and systematic reviews of available randomized controlled studies. Anxiety disorders can effectively be treated with psychotherapy, pharmacotherapy, or a combination of both. First-line drugs are the selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs). Benzodiazepines are not recommended for routine use due to their possible addiction potential. Other treatment options include the calcium modulator pregabalin, tricyclic antidepressants, buspirone, moclobemide, and others. Drug treatment can be combined with psychological treatments. Novel treatment strategies include medications that act on GABA, glutamate, and other neurotransmitter systems. After remission, medications should be continued for 6 to 12 months.


Assuntos
Ansiolíticos/uso terapêutico , Transtornos de Ansiedade/tratamento farmacológico , Inibidores de Captação de Serotonina/uso terapêutico , Inibidores da Recaptação de Serotonina e Norepinefrina/uso terapêutico , Humanos , Psicoterapia
5.
Adv Exp Med Biol ; 1191: 415-449, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002940

RESUMO

Complementary and alternative medicine (CAM) encompasses a wide range of different nonmainstream therapies that have been increasingly used for treatment or adjunctive treatment of various ailments with anxiety/anxiety disorders being one of the commonly CAM (self)-medicated conditions. Thousands of published papers refer to use of CAM in various psychiatric disorders or in healthy or medically ill patients with mood or anxiety difficulties. In this chapter we focus specifically on clinically diagnosed (in line with the standard criteria) anxiety disorders and overview evidence of efficacy/safety of a range of CAM modalities: biologically based therapies (typically herbal preparations and less so nutraceuticals); manipulative and body-based therapies (acupuncture, aerobic exercise, massage, therapeutic touch, repetitive transcranial magnetic stimulation, balneotherapy, and others); mind-body therapies (yoga, Morita therapy, Tai Chi, reiki, Chinese cognitive therapy, religious and spiritual interventions, relaxation, mediation, and mindfulness-based interventions); and alternative medical systems (Ayurveda, homeopathy). We focus exclusively on randomized controlled trials and attempt to evaluate the existing body of evidence in the same manner that is applied to mainstream treatments.


Assuntos
Transtornos de Ansiedade/terapia , Terapias Complementares , Prática Clínica Baseada em Evidências , Terapia por Acupuntura , Exercício , Humanos , Massagem , Ensaios Clínicos Controlados Aleatórios como Assunto , Tai Ji , Ioga
6.
Adv Exp Med Biol ; 1191: 451-464, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002941

RESUMO

Psychodynamic theory is founded on the idea that much, if not most, of human behavior is influenced by forces and experiences that lie outside of conscious awareness. It posits that despite what we may or may not recognize about our lived experience, an essential connection exists between unconscious processes and everyday psychological functioning. By extension, psychodynamic theory presumes that unconscious conflicts are pathognomonic of anxiety disorders and anxiety symptoms more generally. At the same time, the term "psychodynamic" refers not only to that which occurs within one's mind but also what happens between people and within families, groups, and systems. A comprehensive psychodynamic treatment of anxiety attempts to take into account these multiple domains of experience and functioning (including biological and genetic considerations) and applies a specific therapeutic approach to working with patients based in part on clinical techniques first developed by Sigmund Freud 100 years ago.


Assuntos
Transtornos de Ansiedade/psicologia , Transtornos de Ansiedade/terapia , Ansiedade/psicologia , Ansiedade/terapia , Psicoterapia Psicodinâmica , Conscientização , Humanos
7.
Adv Exp Med Biol ; 1191: 489-521, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002943

RESUMO

Anxiety disorders (ADs) are common psychiatric disorders, with a lifetime prevalence estimated at 33.7% in epidemiological studies. ADs are associated with serious disability and severe impairment in quality of life. Although several treatments [e.g. selective serotonin reuptake inhibitors (SSRIs), serotonin-noradrenaline reuptake inhibitors (SNRIs), pregabalin, tricyclic antidepressants and benzodiazepines and/or cognitive-behaviour therapy (CBT)] are recommended, a large number of patients (i.e. from 30 to 70%) do not achieve complete remission. According to the novel paradigm of personalized medicine, the search of possible predictors of both disease vulnerability and treatment response might be the best way to prevent more accurately disease risk and to tailor the most effective treatment for each individual. Although a growing body of studies have proposed several endophenotypes/markers (i.e. neurochemical, neuroimaging, physiological, genetic and epigenetic endophenotypes/markers) as possible predictors of ADs susceptibility and/or treatment response, findings are not robust enough to be considered acceptable to incorporate in the clinical practice. In order to obtain more reliable results, larger studies with a multimodal approach, based on a combination of different biomarkers, are needed.


Assuntos
Transtornos de Ansiedade/terapia , Terapia Cognitivo-Comportamental , Humanos , Inibidores de Captação de Serotonina/uso terapêutico , Inibidores da Recaptação de Serotonina e Norepinefrina/uso terapêutico
8.
Adv Exp Med Biol ; 1191: 543-559, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002945

RESUMO

Anxiety is prevalent in childhood and adolescence. Youth with maladaptive responses to common situations and stressors are at risk of having anxiety disorders. Persistent anxiety symptoms and anxiety disorders can be debilitating with long-term adverse outcomes in adulthood. Hence, decreasing the burden of anxiety disorders is an important public health priority. Development of anxiety disorders has a multifactorial etiology. There is a considerable complex interaction of genetics, temperament, parenting behavior, environmental triggers, and physiologic factors. Identification of these risk factors is key to early detection, prevention, and development of applicable management approaches. Despite several evidence-based treatments published, there are limited prevention strategies available. Effective implementation of prevention strategies is essential and can be achieved by either elimination or reduction of the negative risk factors or strengthening the protective factors on anxiety symptoms and anxiety disorders. This chapter reviews the common risk and protective factors and provides current literature on prevention strategies for pediatric and adolescent anxiety disorders.


Assuntos
Transtornos de Ansiedade/prevenção & controle , Transtornos de Ansiedade/psicologia , Adolescente , Transtornos de Ansiedade/genética , Criança , Humanos , Poder Familiar , Prevalência , Fatores de Proteção , Fatores de Risco , Temperamento
9.
Adv Exp Med Biol ; 1191: 561-576, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002946

RESUMO

Recent data has linked anxiety and its disorders in late life to increased morbidity and mortality, especially related to a higher cardiovascular burden and an increased cognitive decline. Clinically, anxiety symptoms may be more difficult to elicit in older adults who are less accurate in identifying anxiety symptoms and tend to minimize symptoms and to attribute symptoms to physical illness. Although SSRIs have proven more effective than psychotherapy in late-life anxiety, many elderly anxious subjects prefer psychotherapeutic interventions. These interventions appear to work best when tailored for the needs, expectations, and cultural background of older anxious subjects.


Assuntos
Transtornos de Ansiedade , Idoso , Ansiolíticos/uso terapêutico , Ansiedade/complicações , Ansiedade/diagnóstico , Ansiedade/psicologia , Ansiedade/terapia , Transtornos de Ansiedade/complicações , Transtornos de Ansiedade/diagnóstico , Transtornos de Ansiedade/psicologia , Transtornos de Ansiedade/terapia , Doenças Cardiovasculares/complicações , Comorbidade , Humanos , Psicoterapia , Inibidores de Captação de Serotonina/uso terapêutico
10.
Adv Exp Med Biol ; 1191: 3-20, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002919

RESUMO

Magnetic resonance imaging (MRI) is a good tool for researchers to understand the biological mechanisms and pathophysiology of the brain due to the translational characteristics of MRI methods. For the psychiatric illness, this kind of mental disorders usually have minor alterations when compared to traditional neurological disorders. Therefore the functional study, such as functional connectivity, would play a significant role for understanding the pathophysiology of mental disorders. This chapter would focus on the discussion of task MRI-based functional network studies in anxiety. For social anxiety disorder, the limbic system, such as the temporal lobe, amygdala, and hippocampus, would show alterations in the functional connectivity with frontal regions, such as anterior cingulate, prefrontal, and orbitofrontal cortices. PD has anterior cingulate cortex-amygdala alterations in fear conditioning, frontoparietal alterations in attention network task, and limbic-prefrontal alterations in emotional task. A similar amygdala-based aberrant functional connectivity in specific phobia is observed. The mesocorticolimbic and limbic-prefrontal functional alterations are found in generalized anxiety disorder. The major components of task MRI-based functional connectivity in anxiety include limbic and frontal regions which might play a vital role for the origination of anxiety under different scenarios and tasks.


Assuntos
Transtornos de Ansiedade/fisiopatologia , Ansiedade/fisiopatologia , Mapeamento Encefálico , Encéfalo/fisiopatologia , Imagem por Ressonância Magnética , Humanos
11.
Adv Exp Med Biol ; 1191: 21-34, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002920

RESUMO

Network-based approach for psychological phenotypes assumes the dynamical interactions among the psychiatric symptoms, psychological characteristics, and neurocognitive performances arise, as they coexist, propagate, and inhibit other components within the network of mental phenomena. For differential types of dataset from which the phenotype network is to be estimated, a Gaussian graphical model, an Ising model, a directed acyclic graph, or an intraindividual covariance network could be used. Accordingly, these network-based approaches for anxiety-related psychological phenomena have been helpful in quantitative and pictorial understanding of qualitative dynamics among the diverse psychological phenomena as well as mind-environment interactions. Brain structural covariance refers to the correlative patterns of diverse brain morphological features among differential brain regions comprising the brain, as calculated per participant or across the participants. These covarying patterns of brain morphology partly overlap with longitudinal patterns of brain cortical maturation and also with propagating pattern of brain morphological changes such as cortical thinning and brain volume reduction in patients diagnosed with neurologic or psychiatric disorders along the trajectory of disease progression. Previous studies that used the brain structural covariance network could show neural correlates of specific anxiety disorder such as panic disorder and also elucidate the neural underpinning of anxiety symptom severity in diverse psychiatric and neurologic disorder patients.


Assuntos
Transtornos de Ansiedade/patologia , Transtornos de Ansiedade/fisiopatologia , Ansiedade/patologia , Ansiedade/fisiopatologia , Encéfalo/patologia , Encéfalo/fisiopatologia , Fenótipo , Humanos , Vias Neurais
12.
Adv Exp Med Biol ; 1191: 35-59, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002921

RESUMO

Electrocortical network dynamics are integral to brain function. Linear and nonlinear connectivity applications enrich neurophysiological investigations into anxiety disorders. Discrete EEG-based connectivity networks are unfolding with some homogeneity for anxiety disorder subtypes. Attenuated delta/theta/beta connectivity networks, pertaining to anterior-posterior nodes, characterize panic disorder. Nonlinear measures suggest reduced connectivity of ACC as an executive neuro-regulator in germane "fear circuitry networks" might be more central than considered. Enhanced network complexity and theta network efficiency at rest define generalized anxiety disorder, with similar tonic hyperexcitability apparent in social anxiety disorder further extending to task-related/state functioning. Dysregulated alpha connectivity and integration of mPFC-ACC/mPFC-PCC relays implicated with attentional flexibility and choice execution/congruence neurocircuitry are observed in trait anxiety. Conversely, state anxiety appears to recruit converging delta and beta connectivity networks as panic, suggesting trait and state anxiety are modulated by discrete neurobiological mechanisms. Furthermore, EEG connectivity dynamics distinguish anxiety from depression, despite prevalent clinical comorbidity. Rethinking mechanisms implicated in the etiology, maintenance, and treatment of anxiety from the perspective of EEG network science across micro- and macroscales serves to shed light and move the field forward.


Assuntos
Transtornos de Ansiedade/fisiopatologia , Encéfalo/fisiopatologia , Eletroencefalografia , Rede Nervosa , Transtornos de Ansiedade/diagnóstico , Transtorno Depressivo/diagnóstico , Transtorno Depressivo/fisiopatologia , Medo , Humanos
13.
Adv Exp Med Biol ; 1191: 61-70, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002922

RESUMO

Anxiety disorders are characterized by excessive fear and anxiety and related behavioral disturbances. Because diffusion tensor imaging is sensitive to detect subtle pathology of the brain, it has been used to characterize differences in white matter microstructure for a broad spectrum of psychiatric disorders. The neurobiological underpinnings of a trait anxiety seem to be associated with the uncinate fasciculus, a major pathway between the amygdala and orbitofrontal cortex. Apparent WM micro-alterations in patients with panic disorder are present in diverse and widespread regions, although alterations vary in terms of clinical symptom severity and comorbidities. Social anxiety disorder is associated with structural dysconnectivity in a fronto-limbic network consistent with reduced fractional anisotropy values in uncinate fasciculus and inferior longitudinal fasciculus. The pathogenesis of obsessive-compulsive disorder may include abnormal findings in not only the fronto-striato-thalamic circuit but also the posterior and temporal regions of forceps major and cingulum bundle. Studies of white matter status in anxiety revealed overlapping patterns of front-cortical and fronto-limbic changes with uncinate fasciculus and cingulum alterations a frequent component.


Assuntos
Transtornos de Ansiedade/patologia , Ansiedade/patologia , Encéfalo/patologia , Substância Branca/patologia , Anisotropia , Imagem de Tensor de Difusão , Humanos
14.
Adv Exp Med Biol ; 1191: 71-90, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002923

RESUMO

Anxiety disorders include a variety of different disorders including panic disorder (PD), social anxiety disorder (SAD), generalized anxiety disorder (GAD), and phobias. We here focus our review on GAD, SAD, and PD and put a specific emphasis on resting state networks and the coupling between the brain and the heart as all anxiety disorders exhibit abnormal perception of their own heartbeat in some way or the other. Resting state functional connectivity (rsFC) studies demonstrate abnormalities in default-mode network (DMN) in all anxiety disorders, e.g., mostly decreases in rsFC of DMN. In contrast, resting state fMRI shows increased rsFC in salience network (SN) (SAD, GAD) and/or somato-motor/sensory network (SMN) (PD). Since rsFC is coherence- or phase-based operating in the infraslow frequency domain (0.01-0.1 Hz), these data suggest spatiotemporal hypo- or hyper-synchronization in DMN and SMN/SN, respectively. These abnormalities in the neural network's spatiotemporal synchronization may, in turn, impact phase-based temporal synchronization of neural and cardiac activities resulting in decreased (DMN) or increased (SMN/SN) neuro-cardiac coupling in anxiety disorders. That, in turn, may be related to the various psychopathological symptoms like unstable sense of self (as based on unstable DMN showing spatiotemporal hypo-synchronization), increased emotions and specifically anxiety (as related to increased SN showing spatiotemporal hyper-synchronization), and increased bodily awareness (mediated by increased SMN with spatiotemporal hyper-synchronization) in anxiety disorders. Taken together, we here suggest altered spatiotemporal synchronization of neural and cardiac activity within the brain's resting state to underlie various psychopathological symptoms in anxiety disorders. Such spatiotemporal basis of psychopathological symptoms is well compatible with the recently suggested "Spatiotemporal Psychopathology."


Assuntos
Transtornos de Ansiedade/fisiopatologia , Encéfalo/fisiopatologia , Psicopatologia , Descanso , Mapeamento Encefálico , Humanos , Imagem por Ressonância Magnética
15.
Adv Exp Med Biol ; 1191: 93-102, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002924

RESUMO

Several environmental risk factors such as early adverse childhood experiences, stress, and stressful life events are associated with anxiety disorders. Current approaches such as epigenetics and gene-environment interactions were used to identify candidate biomarkers for anxiety disorders to assess determinants of disease. In this chapter, in relation to gene-environment interactions, a variety of association studies regarding anxiety disorders were surveyed. We then showed supporting results from recent association studies such as human studies and animal models in terms of the epigenetic contribution to disease susceptibility to anxiety disorders. At last, future directions and limitations are highlighted. With the advances in multi-omics technologies, innovative ideas regarding disease prevention and drug responsiveness in anxiety disorders require further research in epigenetics and gene-environment interactions.


Assuntos
Transtornos de Ansiedade/genética , Epigênese Genética , Interação Gene-Ambiente , Animais , Epigenômica , Estudos de Associação Genética , Humanos
16.
Adv Exp Med Biol ; 1191: 103-120, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002925

RESUMO

Oxytocin, a neuropeptide synthesized by the hypothalamus, plays a central role in human social behavior, social cognition, anxiety, mood, stress modulation, and fear learning and extinction. The relationships between oxytocin and psychiatric disorders including depression, anxiety, schizophrenia, and autism spectrum disorder have been extensively studied. In this chapter, we focus on the current knowledge about oxytocin and anxiety disorder. We discuss the anxiolytic effects of oxytocin in preclinical and clinical findings, possible related neurobehavioral mechanisms (social cognition, fear learning, and extinction), related neurotransmitter and neuroendocrine systems (hypothalamus-pituitary-adrenal axis, serotoninergic, and GABAergic systems), and studies regarding plasma levels of oxytocin, genetic and epigenetic findings, and effects of intranasal oxytocin in DSM-5 anxiety disorder (primarily social anxiety disorder and separation anxiety disorder) patients.


Assuntos
Transtornos de Ansiedade/metabolismo , Ocitocina/metabolismo , Ansiedade/metabolismo , Medo , Humanos , Comportamento Social
17.
Adv Exp Med Biol ; 1191: 121-140, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002926

RESUMO

Discovery of innovative anxiolytics is severely hampering. Existing anxiolytics are developed decades ago and are still the therapeutics of choice. Moreover, lack of new drug targets forecasts a severe jeopardy in the future treatment of the huge population of CNS-diseased patients. We simply lack the knowledge on what is wrong in brains of anxious people (normal and diseased). Translational research, based on interacting clinical and preclinical research, is extremely urgent. In this endeavor, genetic and genomic approaches are part of the spectrum of contributing factors. We focus on three druggable targets: serotonin transporter, 5-HT1A, and GABAA receptors. It is still uncertain whether and how these targets are involved in normal and diseased anxiety processes. For serotonergic anxiolytics, the slow onset of action points to indirect effects leading to plasticity changes in brain systems leading to reduced anxiety. For GABAA benzodiazepine drugs, acute anxiolytic effects are found indicating primary mechanisms directly influencing anxiety processes. Close translational collaboration between fundamental academic and discovery research will lead to badly needed breakthroughs in the search for new anxiolytics.


Assuntos
Ansiolíticos/uso terapêutico , Transtornos de Ansiedade/fisiopatologia , Ansiedade/fisiopatologia , Descoberta de Drogas , Neurotransmissores/metabolismo , Pesquisa Médica Translacional , Ansiolíticos/farmacologia , Ansiedade/tratamento farmacológico , Ansiedade/metabolismo , Transtornos de Ansiedade/tratamento farmacológico , Transtornos de Ansiedade/metabolismo , Humanos
18.
Adv Exp Med Biol ; 1191: 141-153, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002927

RESUMO

Substantial evidence from various studies suggests a preeminent role for early adverse experiences in the development of psychopathology. The most recent studies reviewed here suggest that early life stressors are associated with an increased risk for anxiety disorders in adulthood. Early life stress predisposes individuals to develop a number of psychiatric syndromes, particularly affective disorders, including anxiety disorders, and is therefore a significant health problem.This review examines the emerging literature on the relationship between stress, hypothalamic-pituitary-adrenal (HPA) axis function, and generalized anxiety disorder (GAD), panic disorder, and phobias and the role of early life stress as an important risk factor for HPA axis dysfunction.The most consistent findings in the literature show increased activity of the HPA axis in depression associated with hypercortisolemia and reduced inhibitory feedback. In addition to melancholic depression, a spectrum of other conditions may be associated with increased and prolonged activation of the HPA axis, including panic, GAD, phobias and anxiety. Moreover, HPA axis changes appear to be state-dependent, tending to improve upon resolution of the anxiety syndrome. Interestingly, persistent HPA hyperactivity has been associated with higher rates of relapse. These studies suggest that an evaluation of the HPA axis during treatment may help identify patients who are at a higher risk for relapse. These findings suggest that this dysfunction of the HPA axis is partially attributable to an imbalance between glucocorticoid and mineralocorticoid receptors. Evidence has consistently demonstrated that glucocorticoid receptor function is impaired in anxiety disorders. Moreover, normal basal cortisol levels and hyper-responsiveness of the adrenal cortex during a psychosocial stressor are observed in social phobics. Finally, abnormal HPA axis activity has also been observed in generalized anxiety disordered patients. Early stressful life events may provoke alterations of the stress response and thus of the HPA axis that can endure during adulthood, predisposing individuals to develop psychopathology.


Assuntos
Experiências Adversas da Infância , Transtornos de Ansiedade/etiologia , Transtornos de Ansiedade/fisiopatologia , Ansiedade/etiologia , Ansiedade/fisiopatologia , Sistema Hipotálamo-Hipofisário/fisiopatologia , Sistema Hipófise-Suprarrenal/fisiopatologia , Estresse Psicológico/complicações , Ansiedade/psicologia , Transtornos de Ansiedade/psicologia , Humanos , Estresse Psicológico/psicologia
19.
Adv Exp Med Biol ; 1191: 155-167, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002928

RESUMO

Anxiety disorders are a complex set of illnesses in which genetic factors, particularly stress, play a role in the etiopathogenesis. In recent years, inflammation and intestinal microbiota have also been included in this complex network of relationships. The functions associated with tryptophan catabolism and serotonin biosynthesis have long been associated with anxiety disorders. Tryptophan catabolism progresses toward the path of the kynurenine in the presence of stress and inflammation. The catabolism of kynurenine is a pathway in which many enzymes play a role and a large number of catabolites with neuroactive properties occur. The body's serotonin biosynthesis is primarily performed by enterochromaffin cells located in the intestines. A change in the intestinal microbiota composition (dysbiosis) directly affects the serotonin biosynthesis. Stress, unhealthy nutrition, and the use of antibiotics cause dysbiosis. In the light of this new perspective, the role of dysbiosis-induced inflammation and kynurenine pathway catabolites activated sequentially come into prominence in the etiopathogenesis of anxiety disorders.


Assuntos
Transtornos de Ansiedade/metabolismo , Transtornos de Ansiedade/fisiopatologia , Encéfalo/fisiopatologia , Microbioma Gastrointestinal , Cinurenina/metabolismo , Disbiose/metabolismo , Disbiose/microbiologia , Humanos , Serotonina/biossíntese , Serotonina/metabolismo
20.
Adv Exp Med Biol ; 1191: 169-184, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32002929

RESUMO

This chapter describes the various animal models that seem relevant to the development of anxiolytic drugs, as well as the human models of induced anxiety, or more precisely the panic inducers including cholecystokinin. It is also mentioned the theoretical model of Deakin and Graeff which seems to keep all its relevance. The knock animals are evoked as relevant tools as well as a new optogenetic technique that needs to be used in this field.


Assuntos
Ansiolíticos , Transtornos de Ansiedade/tratamento farmacológico , Transtornos de Ansiedade/psicologia , Ansiedade/tratamento farmacológico , Ansiedade/psicologia , Modelos Animais de Doenças , Descoberta de Drogas , Animais , Ansiolíticos/farmacologia , Ansiolíticos/uso terapêutico , Colecistocinina/efeitos adversos , Humanos , Optogenética
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