MEMO on the Inclusion of Depressive Personality Disorder in DSM-V (or DSM-5)
December 11, 2009
“Depressive personality disorder is one of the most familiar, frequent and fundamental disorders” (Vachon, David D.; Sellbom, Martin; Ryder, Andrew G.; Miller, Joshua D.; and Bagby, R. Michael, 2009).
The diagnoses of Depressive Personality Disorder and “depressive traits/features” can be conceptualized in a hybrid categorical and dimensional manner for DSM-V. The diagnosis itself is categorical, but the severity and underlying DSM-IV-TR criteria can be treated dimensionally. In addition, while the concept of depressive pd is directly related to a profile of Five-Factor Model (FFM) traits and facets, these more “normal” traits may be viewed as the low end of a depressive pd spectrum or dimension. Additionally the existence of a next step up on this dimension commonly referred to as “depressive traits” or “depressive features” is also supported by the research on constructs such as those considered to be maladaptive expressions of personality traits including cognitive vulnerabilities to depression. Some maladaptive schemas that are sometimes the focus of attention in empirically supported Cognitive Behavioral Therapy may also fit well within this spectrum. The Depressive Personality Disorder itself can be diagnosed when the DSM-V defined diagnostic threshold for a personality disorder is reached. Depressive pd has been shown to have a significant impact on multiple domains of functioning, and a focus on both symptom severity and functional severity is recommended. The DSM-IV criteria for depressive pd already reflect these underlying traits, and these criteria may be more likely to be a focus of empirically supported psychotherapy than are the symptoms of dysthymic disorder.
This dimensional view of depressive pd opens the door to a wealth of research not just on depressive pd, but on cognitive vulnerabilities to depression and other relatively stable factors that have been found to be independent of depression. These factors or maladaptive “depressive traits” are in many ways also quite similar to the diagnostic criteria for depressive pd, and depressive pd has also been found to be relatively stable and independent of depression. The depressive pd construct would be more useful than crafting a laundry list of maladaptive characteristics in individuals who would have otherwise qualified for a depressive pd diagnosis. It also focuses the attention of practitioners on more specific and independent traits which would be useful for practitioners of cognitive-behavioral therapy (to name just one), as opposed to more nebulous constructs such as neuroticism. Even the vulnerability facet of neuroticism tends to unnecessarily lump these relatively independent factors together without giving the clinician an alert to focus on each. Listing depressive pd criteria does give this alert, and additional considerations can also be expressed within the DSM-V narrative for depressive pd. We should keep in mind that personality traits are also abstract concepts without distinct physical findings at this point, and are not necessarily the only building blocks involved in the presentation of individuals with personality disorders. We also should not ignore an existing framework for incorporating depressive traits (such as cognitive and other vulnerabilities to depression) in to DSM-V. The concept of personality disorders currently offers this framework which can be used now for an immediate impact on the field.
Reasons for a proposed change
Depressive traits are well represented in clinical populations and contribute to the presentation of other Axis I and II disorders, however they are currently not well represented in the main text of the DSM-IV-TR. Including Depressive Personality Disorder in the main text of DSM-V would highlight psychiatric factors with a profound impact on prognosis and treatment success. In addition to creating distress and interpersonal problems in their extreme form, depressive pd is constructed of clinically useful concepts that suggest a risk for the onset of other problems, a longer course of distress and risk of recurrence of distress. The criteria of depressive pd taken together can be seen as an engine within and individual which generates pathology and keeps fueling that pathology once it has started. Meeting the criteria for an Axis I disorder at some points in their lives should be expected of someone with personality disorders, otherwise the individual may actually fall somewhat lower than the “disorder” point on the maladaptive personality dimension. Including depressive pd in DSM-V is supported and will urge clinicians to address factors which may lead to treatment resistance and treatment failure if left unaddressed. These factors are also sometimes addressed in psychotherapies which are described as empirically supported, and highlighting them may also highlight the need for the EST/EVT approach to address them.
Depressive pd has been shown to be generally consistent with or superior to the other personality disorders on multiple benchmarks, including diagnostic overlap (Finnerty, 2009). Depressive personality disorder has more clinical utility than concepts such as dysthymic disorder, and its inclusion would involve more positive benefits for patients. Dysthymic disorder actually has a greater risk of redundancy with DSM-V mood disorders than does depressive personality disorder. Including depressive pd in DSM-V will also increase attention to underlying maladaptive patterns of thinking and behavior which are sometimes a focus of empirically supported cognitive behavioral treatment. It would also increase research attention on the components involved in depressive personality disorder. Depressive Personality Disorder is ready for the next step and promoting it to a recognized diagnosis in DSM-V will have a beneficial impact on clinical practice and the mental health of patients.
Evidence for change
Depressive pd has repeatedly been found to be a valid diagnosis which can be differentiated from other disorders (Huprich, 2009). It has a degree of stability similar to other personality disorders and is present even when a mood disorder such as depression is not. The criteria which construct depressive pd can be viewed as consistent with cognitive vulnerabilities to depression, maladaptive schemas and other conceptualizations of maladaptive personality traits. These underlying cognitive vulnerability concepts have also been found to be distinct from depression (See the listed research by Hankin, for example). The view that some people are more susceptible to stress and other factors is a long-held one in psychiatry and psychology and has been receiving increased research attention (See articles from individuals such as Hankin and Belsky). This is a worldview consistent with emerging biological and psychological findings. It is an appropriate next step in the evolution of our diagnostic system as it can be a bridge to future findings and research in both psychology, neuroscience and other biological sciences which are proceeding in the direction of this worldview.
See also (Finnerty, 2009 a) for an extensive review of the recent literature and additional commentary on the inclusion of depressive pd in DSM-V. A Google books electronic version of the 1st edition is now available for free online and conveniently linked to from: www.depressivepersonality.com. The print copy is available from Amazon or from the author by request.
A need for the category
As was noted earlier, depressive traits are well represented in clinical populations and contribute to the presentation of other Axis I and II disorders, however they are currently not well represented in the main text of the DSM-IV-TR. The inclusion of depressive personality disorder will increase practitioner’s awareness of factors which create the potential for treatment resistance in a patient, and also creates risks for a longer course of treatment, greater chance of recurrence, and greater risk of other difficulties.
Psychology and Psychiatry have historically originated a number of overlapping abstract concepts. While not necessarily overlying embracing any one theory, the depressive personality disorder is well represented by constructs from multiple perspectives in Psychology & Psychiatry and can pull together multiple lines of research in one location for use by the clinician.
Relationship with other DSM-V diagnoses
Depressive Personality Disorder, as well as the personality disorders in general, have been criticized at times for their potential diagnostic overlap and the degree of co-occurrence with other disorders. In clinical reality, an individual would generally need to present with some distress, interpersonal difficulties or other problems which could be consistent with symptoms of an Axis I disorder just to qualify for a “full blown” Axis II disorder. This is the result of the very nature of the personality disorder criteria. Depressive personality disorder tends to be compared to dysthymic disorder, avoidant personality disorder and borderline personality disorder. It has been found to be separate and distinct from these constructs, however, and can be differentiated. In addition, the criteria for depressive personality disorder closely resembles various constructs sometimes referred to as cognitive vulnerabilities to depression which are seeing increased research attention. For example, the “is brooding and given to worry” may be seen as related to some forms of depressive rumination. Ryder, Andrew G.; McBride, Carolina & Bagby, R. Michael (2008) found depressive personality disorder to be related to all of the cognitive vulnerability concepts they addressed in their study. These cognitive vulnerabilities have also been found to be stable, trait-like factors independent of depression (See research by Hankin and others).
Researchers A. Ryder, R. M. Bagby and others were more critical of the depressive personality disorder construct in the past, particularly with the potential overlap with the concept of dysthymic disorder. However, some of depressive pd’s most published critics have become supporters. More recently they have noted that “depressive personality disorder is one of the most familiar, frequent and fundamental disorders.” They note that expert consensus on the depressive pd prototype suggested better agreement than the other personality disorders previously evaluated (Vachon, et. al.; 2009).
As noted, in the past, Ryder, Bagby and others (2002) had offered criticism of the DSM-IV depressive personality construct, though generally their concerns about DPD could be directed at personality disorders under DSM-IV in general. They criticized DPD in light of its potential overlap with dysthymic disorder and suggested viewing the construct dimensionally under a changed DSM-V system based on the Five-Factor Model of personality, yet in this more distant they also used a categorical view of dysthymic disorder as opposed to a dimensional view of mood disorders. It is not fully clear if dysthymic disorder would even be needed in DSM-V if a dimensional expression of mood disorders includes relevant course specifiers for depression and revisions to how severity and functioning are communicated. Dysthymic disorder is often a diagnosis made by what it is not. Major depressive disorder with a chronic specifier communicates the two year duration found in dysthymic disorder. This 2 year duration reflects a longer duration, but it is in general rather arbitrary and not related to any distinction that exists in the real world. A mildly severe major depressive disorder that is chronic under DSM-IV is not dysthymic disorder, though depending on how severity is communicated and in what way the categories may change dysthymic disorder may become redundant with a more dimensionally defined mood disorder diagnosis in DSM-V. This is particularly salient when considering a diagnosis of dysthymic disorder should not be made if there was a major depressive episode within the first 2 years of the dysthymic disorder and the disorder should not be “better accounted for” by “chronic Major Depressive Disorder” (p 380, American Psychiatric Association, 2000). Hirschfeld (1991) expressed the opinion that “Many clinicians and researchers believe that dysthymia is too similar to major depression in its emphasis on depressive symptomology (especially vegetative). They believe that it fails to consider characterological aspects, in particular cognition.” Dunner (2005) noted that there were significant similarities between the various subtypes of chronic depression, including dysthymia, and suggested collapsing them in to one category called “chronic depression.” If there is a move towards less categorical thinking and more dimensional approaches toward mood disorders, dysthymic disorder may become overly redundant with a chronic depressive disorder; whereas DPD would continue to offer additional, clinically useful information and can be differentiated from a “milder form” of chronic depression. Though it is not best classified as a mood disorder, depressive personality disorder like other personality disorders, should of course continue to be viewed as involving a mood component.
The exclusion criterion of not diagnosing depressive personality disorder if it is better accounted for by dysthymic disorder should be dropped for DSM-V. As was indicated, the dysthymic disorder category is an arbitrary one which may not fit in well with the new theoretical framework of DSM-V. The use of “better accounted for” is vague, particularly when considering DPD may better account for the patient’s presentation in situations where enduring personality characteristics significantly contribute to the presentation, and many “non-textbook” patients will likely meet DSM-IV-TR criteria for both disorders since both include chronic mood states. What guidelines could help clinicians evaluate whether dysthymic disorder “better” accounts for the DPD presentation, and exactly how did dysthymic disorder acquire primacy over Depressive PD? Many mood disorders, including dysthymic disorder, are categorized via broad lists of symptoms leading to heterogenous groups of individuals with diverse etiologies and presentations. Also impacting the “not better accounted for” criterion is the assumption that DPD is more mild than dysthymic disorder, however (Finnerty, 2009) refutes the flawed arguments that DPD represents only a mild form of mood disorder lower on the spectrum of mood disorders than dysthymic disorder. This argument is not supported by recent research in to DPD. The vague statement about it not being better accounted for by dysthymic disorder unnecessarily interferes with clinical judgment, introduces excessive subjectivity impacting standardization and should not be included in DSM-V. The authors of a multi-year follow up study on DPD noted that “The DSM-IV exclusion of depressive personality disorder that is ““better accounted for”” by dysthymic disorder was not employed, as it is unclear how this can be determined” (Laptook, et. al., 2006). This long term study (10 years) not using this criterion would offer support for choosing to also not use the criterion under DSM-V.
The potential overlap of depressive personality disorder with a construct which is essentially depressive symptoms for 2 or more years should not be concerning. As many have noted and the basic description of a personality disorder would suggest, personality disorders include distress and mood concerns. It is one of the things which distinguishes them from “normal” personality functioning. The inclusion of the Axis II factors assist in communicating highly relevant information to treatment, rather than simply communicating symptoms and a duration which can lead to a heterogenous group of patients which can lead to research difficulties on chronic depression treatment.
Potential harm
The actor/observer effect may certainly come in to play, and some patients may be diagnosed with a personality disorder when a normal response to situational stressors is more consistent with the evidence. However, these patients would still likely benefit form any treatment received. The greater harm would be in continuing to under-treat individuals for mild depression symptoms when there is a high risk for greater functional limitations than would be expected in someone with mild depression. If they are left unaddressed via CBT or another means, these underlying maladaptive patterns will continue to create distress and interpersonal concerns.
While some may argue that a personality disorder “pathologizes” or “overpathologizes” someone with depression or mood problems, this may be based on an assumption that personality disorders are not treatable. The inclusion of depressive pd in DSM-V may actually improve the treatment outcomes of this group of individuals. Depressive personality disorder will focus attention on those stable patterns or “depressive traits” involved in this personality disorder. Given this image that “personality” can not be changed, the greater political and stigmatizing risk may be in “pathologizing normal personality,” suggesting FFM or other “normal” personality traits were in a range which require a specific kind of treatment, as this may create even more of an illusion of hopelessness and lack of ability to benefit from treatment in patients.
Available treatments
Certainly the inclusion of depressive personality disorder in the main text of DSM-V will help to stimulate interest in, funding of and the actual publication of research on the treatment of depressive personality disorder.
However, many of the underlying concepts are cornerstone’s of Beck’s Cognitive Therapy or other similar theories related to depressive traits. It stands to reason that focusing on these criteria could also promote the use of such empirically supported treatments.
Meets criteria for a mental (psychiatric) diagnosis.
As noted, depressive personality disorder is not simply a variation of normal psychological functioning. It is however anchored in research on personality and can be viewed as an expected reaction when personality functioning moves in to the maladaptive range. Depressive Personality Disorder does have a strong relation to measures of personality, including those measuring traits and facets of the Five-Factor Model, which supports its location among the personality disorders.
In reviewing previous studies and in conducting their own, Vachon, et. al. (2009) provide a profile of FFM traits and facets common to individuals with depressive personality disorder. These are generally measured by the NEO-PI-R. They also noted they tended to score higher on certain MMPI-2 RC scales. Multiple inventories have been crafted including The Depressive Personality Disorder Inventory (see Huprich, 2009 for a general review and other references from ex: Huprich for more specifics on these inventories). As with most instances in assessment, the clinician must put together all of the information at their disposal from testing, collateral evidence and the clinical interview to make a useful diagnostic decision.
New empirical evidence has been generated since the publication of DSM-IV which supported the inclusion of Depressive PD in DSM-V. The research supports the validity of the diagnosis. Clinicians report depressive pd is useful and a simple google search supports that it is already being used. A “depressive personality” is used commonly in the public (try a google search and this is evident). It is also used under Personality Disorder NOS by clinicians. I have seen it diagnosed by other professionals when I review their records submitted for a Social Security Disability determination, and a google search reveals individuals on message boards and blogs searching for information about it as their Psychiatrist or other professional had diagnosed them with it.
On 12/11/09 a Google search from Columbus, OH produced the following number of hits for each personality disorder in quotes (minus the word disorder). As quotes were used in the search, each result is a specific occurrence of the phrase “X personality.”
626,000 “obsessive-compulsive personality”
531,000 “borderline personality”
460,000 “narcissistic personality”
430,000 “antisocial personality”
143,000 “paranoid personality”
120,000 “schizotypal personality”
115,000 “schizoid personality”
107,000 “avoidant personality”
99,700 “dependent personality”
84,100 “histrionic personality”
73,500 “depressive personality”
The number of search results for “Depressive personality” approach the other personality disorders despite it not being included in the main text of the DSM-IV, or being “officially recognized.” The concept of a “depressive personality” is clearly in use.
While the depressive pd criteria may sound similar to depression or anxiety symptoms, they are also relatively stable, maladaptive personality characteristics which create vulnerability to emotional problems. The depressive pd criteria reflect characteristics which can be assessed dimensionally and create impairment at more extreme levels. While at lower levels the depressive pd criteria may be seen as minor variations of normal personality characteristics, at higher levels they lead to significant difficulties. Coding features of depressive pd offers clinicians the ability to communicate the presence of stable depressive traits which have had increased research attention. For example, Hankin (2008) found cognitive vulnerabilities to depression to be fairly stable, enduring processes. A negative cognitive style, such as is seen in depressive pd, tended to be one of the most stable vulnerabilities studied. Ryder, at. al. (2008) found depressive pd to be related to all depression vulnerabilities assessed in their study. This would be an expected finding considering the depressive pd criteria generally look like these “vulnerabilities.” These cognitive vulnerabilities can be viewed as relatively stable depressive traits on a dimension with depressive personality disorder. These factors alone can create interpersonal problems and functional limitations and when they are present to a sufficient degree a depressive personality disorder diagnosis can be made.
Depressive pd is also correlated with neuroticism. Neuroticism is related mildly to many of these independent vulnerability constructs which make up the depressive pd criteria, but it is generally more associated with depression when factor analyses have been conducted. While neuroticism is sometimes treated as a cognitive vulnerability, it may be a nonspecific collection that includes these factors. Per Hankin, et. al.’s (2007) factor analyses, “cognitive vulnerability is not reducible to general trait neuroticism.” The many maladaptive expressions of depressive traits are not adequately covered by neuroticism alone but can be expressed through a depressive pd or depressive traits diagnosis. As DSM-V moves towards a more dimensional view of disorders, including depressive pd would increase attention on these underlying dimensional trait structures which should not be overlooked. It would also highlight factors with a profound impact on prognosis. In addition to creating distress and interpersonal problems in their extreme form, depressive pd is constructed of clinically useful concepts that suggest a risk for the onset of other problems, a longer course and risk of recurrence. As these vulnerabilities/maladaptive characteristics drift away from normal personality in to the maladaptive, they can be referred to as depressive traits (or features) and create depressive personality disorder in their most extreme form. It includes more information than the simple description of course in dysthymic disorder. It is also not surprising given it’s underlying constructs that depressive pd is functionally impairing in itself, creates interpersonal difficulties and should be considered a severe personality disorder that includes distress. It is not the same as a sub-threshold or minor depressive disorder, and should actually be looked on as more severe than these conditions (see Finnerty, 2009 for a more extensive review).
Depressive personality disorder should be included in the main text of DSM-V under the Personality Disorders section. However, as noted earlier it should be included without the exclusion criterion related to dysthymic disorder. A dimensional view of depressive pd is also supported.
© Todd Finnerty
A list of references related to depressive personality disorder: http://www.depressivepersonality.com/references.html