Anxiety disorders are the most prevalent of the psychiatric disorders, account for a significant proportion of mental illness costs, and include some of the most disabling medical disorders. Anxiety disorders, which currently include the obsessive-compulsive disorders, continue to be poorly diagnosed and undertreated across a broad range of countries. It is possible that the universal experience of anxiety as an adaptive emotion makes it more difficult for patients and clinicians to conceptualize symptoms in terms of psychopathology.

Nonetheless, there have been significant advances in our understanding of anxiety and obsessive-compulsive disorders, and in our ability to manage these conditions successfully. Research on anxiety and obsessive-compulsive disorders exemplifies the goals of translational investigation; preclinical work has not only allowed an exploration of known clinical phenomena, but has also led directly to novel clinical interventions. Investigators around the globe are continuing to contribute to research on anxiety and obsessive-compulsive disorders.

In human terms, resilience is an ability to cope with stress and varies with context, time, age, gender, and cultural origin. Resilience shifts the focus of psychological investigation onto increasing the positive rather than reducing the negative. Inquiry into resilience has evolved from descriptions of resilient qualities, to discovery of the process to attain resilience, to uncovering the motivation to reintegrate in a resilient manner. Much of the research on resilience has focused on children in settings such as family violence, extreme poverty, war, and natural disasters. A coherent pattern of characteristics associated with successful adaptation has emerged. Salient characteristics include commitment, dynamism, humor in the face of adversity, patience, optimism, faith, and altruism. As such, resilience may represent an important target of treatment in anxiety, depression, and stress reactions. Resilience can be quantified, but available measures need to be validated transculturally. There exist many possible determinants of resilience, including neurobiologic, genetic, temperament, and environmental influences. Resilience is modifiable on individual and cultural levels. Posttraumatic stress disorder is an example of a serious disorder associated with impaired stress coping that can improve with treatment.

Anxiety and depression are common disorders that frequently co-exist. Both disorders show good response to antidepressants, especially the selective serotonin reuptake inhibitors. Some suggest that these disorders are variants of the same underlying brain pathology. This review examines the similarities and differences between anxiety and depression in terms of the known neurobiological etiologic mechanisms as well as their biological underpinnings and response to treatment. Sufficient and significant differences between these disorders support the view that they are independent entities. Shared abnormalities in the 5HT1A receptor function, for example, may help explain some of the comorbidity.

Response and remission rates are commonly used to evaluate the efficacy of treatments for anxiety disorders and other psychiatric illnesses. Response is generally regarded as a clinically meaningful improvement in symptoms, while remission, the goal of treatment, is generally thought of as the absence or near absence of symptoms following illness, accompanied by a return to premorbid levels of functioning. Response and remission are often defined using psychiatric rating scales, based on score cutoffs or the magnitude of score changes from baseline. While no universally accepted criteria exist, a commonly used threshold for response is a >50% improvement in the total score, while for remission, various cutoff points have been used. Comparison of cutoffs or change scores for disease-specific scales with Clinical Global Impressions ratings is a useful way of evaluating response and remission criteria across disorders. To illustrate the use of disease-specific and global measures, this article summarizes data from randomized, placebo-controlled studies of adult patients with generalized anxiety disorder, social anxiety disorder, or panic disorder treated with the serotonin norepinephrine reuptake inhibitor venlafaxine extended release, for which acute-phase data are available (a total of 13 trials).

Anxiety disorders in the United States are prevalent, widespread, and disabling. These illnesses may account for almost one third of the $148 billion total mental health bill each year. Pharmacologic options include tricyclic antidepressants, monoamine oxidase inhibitors, serotonin norepinephrine reuptake inhibitors, selective serotonin reuptake inhibitors, and anxiolytics. Psychological treatments include cognitive-behavioral therapy (CBT), cognitive therapy, exposure, and ritual prevention therapies. Despite insufficient evidence, many experts recommend combined treatment, generally medication with CBT. A literature review was conducted to examine studies with random assignment, adequate methods and sample sizes, blind assessments, sufficient dosages and durations of treatment, and satisfactory reporting of data, to determine whether combined treatment was superior to monotherapy. Twenty-six randomized clinical trials were identified; nine met review criteria. A review of relevant studies could not confirm the superiority of combined treatment over monotherapy. In one of four studies of obsessive-compulsive disorder, combined treatment produced better results than monotherapy.  There was no evidence of superiority for combined therapy over monotherapy for the treatment of social phobia or generalized anxiety disorder. There were no studies that met review criteria for either specific phobia or posttraumatic stress disorder (PTSD). With panic disorder, there was evidence that combined treatment might actually lead to worse outcome. Combined treatment is commonly recommended, but empirical support is limited. More research is needed. There are few well-designed studies, and little data regarding PTSD and specific phobias.

Evidence-based medicine (EBM) enables clinicians to justify decision making, enhances the quality of medical practice, identifies unanswered research questions, and ensures the efficient practice of medicine. Implementation of evidence-based mental health programs requires education, time, and improved effort by administration, regulatory, and clinical professionals. Essential to these efforts are consistent incentives for change, effective training materials, and clear clinical guidelines. Guidelines exist within the framework of EBM. Good guidelines are simple, specific, and user friendly, focus on key clinical decisions, are based on research evidence, and present evidence and recommendations in a concise and accessible format. Potential limitations of guidelines to improve clinical outcomes in anxiety disorders are the widespread distribution of anxiety symptoms in primary care, health inequalities across patient groups, persistent misconceptions regarding psychotropic drugs, and low confidence in using simple psychological treatments. Clinical guidelines generally specify therapeutic areas covered and not covered, but often there is no mention of cost or cost effectiveness of treatment. Guidelines can inform clinical decision making, but administrators of drug formularies may regard themselves as being primarily responsible for limiting costs and access to certain medications, even if these decisions are at odds with guideline recommendations.