Depression is defined in diagnostic literature as a mood disorder characterized by depressed mood, loss of interest or pleasure in activities, significant changes in weight, insomnia or hypersomnia, psychomotor agitation or retardation, fatigue or loss of energy, feelings of worthlessness or excessive guilt, difficulty concentrating, and suicidal ideation and/or attempts. Research suggests a link between depressed mood and monoamine depletion, elevated cortisol, and inflammation, but existing laboratory evidence is inconclusive. Current treatments for depression include selective serotonin reuptake inhibitors (SSRIs), cognitive behavioral therapy (CBT), and lifestyle changes; however, more severe forms of the disorder can require other medication, sometimes in combination with electroconvulsive therapy (ECT).
Disagreement persists over how to define and classify depression, in part due to its ambivalent relationship to melancholia, which has existed as a medical concept in different forms since antiquity. Melancholia was reconfigured in 19th-century medicine from traditional melancholy madness into a modern mood disorder. In the early 20th century, melancholia gradually fell out of use as a diagnostic term with the introduction of manic-depressive insanity and unipolar depression. Following the publication of DSM-III in 1980 and the introduction of SSRIs a few years later, major depressive disorder became ubiquitous. Consumption of antidepressants have continued to rise year after year, and the World Health Organization notes depression as the leading cause of disability worldwide.
At present, internationally recognized systems of classification favor a single category for depressive illness (alongside a circular mood disorder, bipolar I and II), but this view is challenged by clinicians and researchers who argue for the reinstatement of melancholia as a separate and distinct mood disorder with marked somatic and psychotic features.
Jarred Gallegos, Julie Lutz, Emma Katz, and Barry Edelstein
The assessment of older adults is quite challenging in light of the many age-related physiological and metabolic changes, increased number of chronic diseases with potential psychiatric manifestations, the associated medications and their side effects, and the age-related changes in the presentation of common mental health problems and disorders. A biopsychosocial approach to assessment is particularly important for older adults due to the substantial interplay of biological, psychological, and social factors that collectively produce the clinical presentation faced by clinicians. An appreciation of age-related and non-normative changes in cognitive skills and sensory processes is particularly important both for planning the assessment process and the interpretation of findings. The assessment of older adults is unfortunately plagued by a paucity of age-appropriate assessment instruments, as most instruments have been developed with young adults. This paucity of age-appropriate assessment instruments is an impediment to reliable and valid assessment. Notwithstanding that caveat, comprehensive and valid assessment of older adults can be accomplished through an understanding of the interaction of age-related factors that influence the experience and presentation of psychiatric disorders, and an appreciation of the strengths and weaknesses of the assessment instruments that are used to achieve valid and reliable assessments.