New MDD Treatment Guidelines Fall Short

By Ghaemi | Clinical Psychiatry News, December 2010 | Go to article overview

New MDD Treatment Guidelines Fall Short

Ghaemi, Clinical Psychiatry News

The American Psychiatric Association recently released new treatment guidelines for patients with major depressive disorder.

The guidelines were developed by prominent qualified experts (most of whom had pharmaceutical industry relationships), an independent review panel (without pharmaceutical industry ties), and comments from dozens of experts and organizations (doi: 10.1176/appi.books.9780890423387.65 4001). They are 152 pages in length, and include more than 1,000 references, in addition to a 6-page executive summary. Though comprehensive and useful in many ways, the guidelines have four major potential shortcomings.

First, although the guidelines recommend antidepressant use in mild depression ('An antidepressant medication is recommended as an initial treatment choice for patients with mild to moderate major depressive disorder"), recent meta-analyses that incorporate all randomized clinical trial data of antidepressants for major depressive disorder (MDD) throw some doubt on the strength of this recommendation (PLoS Med. 2008;5:e45 and N. Engl. J. Med. 2008;358:252-60).

When looked at in terms of drug vs. placebo differences in depression rating scales, the amount of benefit (effect size) was much smaller in reality (including all unpublished studies) than in the published scientific literature. In mild depression in particular, antidepressants are almost identical to placebo (the drug placebo differences are nearly 0), whereas clinically notable benefits only occur in severe depression (drug/placebo differences are about 5 points).

These differences could be explained in many different ways. There are statistical possibilities: It is always harder to show a small effect size difference as in mild depression than a large one as in severe depression.

It also could be that the extremely broad and heterogenous MDD category does not represent primarily a diseaselike antidepressant-responsive biological depression, as with older concepts of melancholia. Response in severe depression might pick out such melancholia.

Second, the discussion of maintenance treatment with antidepressants for recurrent MDD is relatively uncritical ("During the maintenance phase, an antidepressant medication that produced symptom remission during the continuation phase should be continued at a full therapeutic dose"). In the National Institute of Mental Health-sponsored Sequenced Treatment Alternatives to Relieve Depression (STAR*D) study, although acute efficacy was seen in 60%-70% of subjects when all antidepressant classes were used sequentially, about one-half of those persons relapsed in up to 1 year of follow-up, despite staying on the same antidepressants that had helped them acutely (Am. J. Psychiatry 2006;163:1905-17).

If those who stopped medications because of side effects are included, only about one-third of patients stayed and remained well for up to 1 year. It might be safe to conclude that antidepressants are more effective acutely than in maintenance treatment. The guidelines do not describe these results.

This possibility of limited maintenance efficacy also is supported by an analysis of maintenance randomized controlled trials with antidepressants. These data, presented earlier this year in a poster by Dr. Brian Briscoe and Dr. Rif El-Mallakh at the APA annual meeting in New Orleans, looked at 16 published studies and found that only 1 could be shown to have benefit beyond 6 months of follow-up. In the absence of a critical review of such studies, the maintenance recommendations have a diaphanous quality.

Third, little acknowledgment exists of the risk of probable increased suicidality with antidepressants. Not only that, but the guidelines suggest that a relationship between antidepressants and suicidality does not exist ("A predictive relationship to suicide has never been demonstrated"). This statement is made despite an almost twofold increase in suicidal ideation or attempts in the Food and Drug Administration meta-analysis of multiple randomized controlled trials (in young adults and children, but not older groups) (Arch. …

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New MDD Treatment Guidelines Fall Short


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