Depression

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Patients with low back pain (LBP) face many decisions, ranging from the nature and extent of the evaluation they should undergo to determining which treatments are likely to be most effective. These choices can be confusing not only to those who are in pain but also to their health care providers.

Discovering the biological basis of major depressive disorder (MDD) could lead to improved medication and therapeutic treatment for patients with this condition. To date, the cause of MDD is not well understood, but researchers believe that elevated levels of the brain serotonin, 5-hydroxytryptamine (5-HT), may play a role.

Intensive psychosocial intervention was found to improve overall functioning in patients with bipolar depression, concluded researchers of the Systemic Treatment Enhancement Program for Bipolar Disorder (STEP-BD) trial. Results were reported in the September 2007 issue of the American Journal of Psychiatry.

Here is the conundrum: You have completed treatment with a fascinating and complex patient. Mr A has bipolar depression, Marfan syndrome, and hypothyroidism. You not only managed to navigate around the rocks of his medical problems, but you also managed to stabilize Mr A's bipolar disorder using a combination of lithium (Eskalith, Lithobid), thyroxine, and interpersonal therapy. You would now like to share your experience with colleagues, so you write up the case history; then suddenly, you are seized with misgivings.

Early relapse is a limiting defect in electroconvulsive therapy (ECT). Although more than 80% of patients with a severe depressive illness who complete an acute course of ECT are relieved within three weeks, up to 60% relapse within six months, despite continuation treatments with antidepressant medications.1,2 In a large, government-supported, collaborative study led by the Columbia University Consortium (CUC), patients with unipolar major depression that had failed to respond to multiple trials of medications were treated with ECT to clinical remission and then randomly assigned to one of three continuation treatments--placebo, nortriptyline (Aventyl, Pamelor) alone, or the combination of nortriptyline and lithium (Eskalith, Lithobid). The patients were monitored for adequacy of blood levels.1 Within the six-month follow-up period, 84% of patients treated with placebo, 60% of patients treated with nortriptyline, and 39% of patients treated with the combination medications had relapsed.

Mood disorders are among the most prevalent forms of mental illness. Serious depression is especially common; based on a face-to-face survey conducted from December 2001 to December 2002, the past-year prevalence rate of clinically significant major depressive disorder (MDD) was estimated to be 6.6%, affecting at least 13.1 to 14.2 million Americans.

In this article, we use the example of major depressive disorder (MDD) to review research efforts to identify predictors of treatment response, both to antidepressant medications and to psychotherapy. We describe the promises and limitations of this research, with some emphasis on brain imaging studies, and then discuss how this work may be integrated into clinical practice in the future.