Testing an APA Practice Guideline: Symptom–Targeted Medication Utilization for Patients With Borderline Personality Disorder

Treatment-seeking individuals aged 18 to 45 years were recruited from clinical services affiliated with each of the four sites conducting the Collaborative Longitudinal Personality Disorders Study (CLPS). CLPS is a study of the longitudinal course and impact of four representative and contrasting personality disorders (PDs): schizotypal, borderline, avoidant, and obsessive-compulsive. The primary aims and design of the CLPS are described in detail elsewhere (5). Potential participants were prescreened to exclude patients with active psychosis, acute substance intoxication or withdrawal, or a history of schizophrenia, schizoaffective, or schizophreniform disorders. The patients were predominately white (76%), female (64%), and from Hollingshead and Redlich (6) socioeconomic classes II and III (65%). All eligible participants signed written informed consent after the research procedures had been fully explained to them.

The Diagnostic Interview for DSM-IV Personality Disorders (DIPD-IV) (7) was used by trained clinical interviewers to assess the presence of symptoms of BPD at baseline. The DIPD-IV is a semi-structured interview for the diagnosis of all DSM-IV PDs, by which information is elicited to rate the presence or absence of diagnostic criteria for each PD over the preceding 2 years. In addition, patients must confirm that the PD features they report have been characteristic of them for most of their adult lives and are descriptive of their “personality or temperament,” in order to receive a diagnosis. A follow-along version, the DIPD-FAV, was used to track the presence of BPD symptoms on a monthly basis at 6-month, 1-year, and 2-year follow-up assessments. The final sample for these analyses was 165 patients who met criteria for BPD (interrater reliability k=0.68; test-retest k=0.69) (8) at study intake and for whom medication utilization data were available for the subsequent 2 years.

The Longitudinal Interval Follow-up Evaluation Adapted for the Personality Disorders Study (LIFE-PS) (9) was also administered at 6-month, 1-year, and 2- year follow-up assessments to collect prospective data on medications used over a 2-year period (data were collected during the period 1996–1999, prior to the publication of the APA Guideline in 2001). The LIFE-PS provides for a detailed assessment of patient reported use of over 100 varieties of psychotropic medications, with weekly recordings of specific medications used and daily dosages. In the present analyses, relevant medications were aggregated into five groups, selective serotonin reuptake inhibitors (SSRIs), neuroleptics, anticonvulsants, lithium, and clonazepam, all five of which are explicitly mentioned in the Guideline algorithms.

The three symptom clusters—cognitive-perceptual, affective dysregulation, and impulsive-behavioral dyscontrol—were measured using DIPD-IV items. The cognitive-perceptual cluster was represented by a DIPD criterion assessing transient stress-related paranoia or dissociation; the affective dysregulation cluster was comprised of items measuring inappropriate and intense anger, affective instability, and frantic efforts to avoid abandonment; and the impulsive-behavioral dyscontrol cluster was made up of criteria assessing recurrent suicidal or self-mutilating behavior and impulsivity in at least two self-damaging areas. Item selection was informed by a previous comfirmatory factor analysis of BPD criteria by Sanislow et al. (10) using CLPS data.

To be counted in a symptom cluster, the patient had to have met one or more criteria for that cluster at least 50% of the time over the 2-year period. Because the symptom clusters are not independent and patients most often presented with symptoms that met criteria for more than one cluster, we also analyzed the three symptom cluster variables as continuous measures, in addition to separating patients into different cluster groups. Each criterion was rated on the baseline DIPD-IV as absent (0), present but of questionable clinical significance (1), or present and clinically significant (2). Total scores for each cluster for each participant were then computed by adding the pertinent item scores.

All statistical analyses were conducted using SAS Version 8.2 (11). Chi-square comparisons were used to assess differences in the proportion of patients having each symptom cluster and also receiving each class of medication. Five logistic regression analyses were conducted to examine the association of personality and other baseline variables with use of medication over the 2-year follow-up period. Goodness-of-fit for each model was assessed using Hosmer and Lemeshow’s C statistic (12). This was calculated by grouping cases according to deciles of predicted probabilities and then comparing the expected number of events in each group with the number observed. The statistic is well approximated by the chi-square distribution with eight degrees of freedom. Variables entered into each model were the following: the three BPD symptom clusters, age category (below 30 years or 30 years and older), race (minority or Caucasian), gender, socioeconomic status (Hollingshead 5 classes), and Global Assessment of Functioning Scale (GAFS) (13), averaged over the 24 months.

Chi-square analyses (Table 1) showed that use of neuroleptics and use of anticonvulsants were significantly related to the presence of impulsive-behavioral dyscontrol. There were no significant associations, however, between symptom clusters and use of SSRIs, lithium, or clonazepam.

Of the five regression models, three were significant: neuroleptics (p<0.0001), anticonvulsants (p<0.0002), and clonazepam (p<0.0009). However, only two classes of medications, the neuroleptics and anticonvulsants, were related to any of the BPD symptom cluster variables (Table 2). Affective dysregulation did not predict any of the five categories of medication use. Impulsive-behavioral dyscontrol symptoms significantly predicted both neuroleptic (OR=1.53, 95% CI=1.03–2.27) and anticonvulsant (OR=1.57, 95% CI=1.08–2.26) use. Cognitive-perceptual symptoms were inversely related to anticonvulsant use (OR=.60, 95% CI=0.36–0.99). In addition, GAF scores were related to both neuroleptic (OR=0.90, 95% CI=0.86–0.94) and anticonvulsant (OR=0.94, 95% CI= 0.90–0.98) use, with those at lower levels of functioning more likely to receive these medications. Anticonvulsants were also significantly more likely to be taken by women (OR=2.45, 95% CI=1.09–5.50).

The APA Practice Guideline for the Treatment of Borderline Personality Disorder recommends SSRIs as first line medications for adjunctive pharmacotherapy when symptoms of affective dysregulation or impulsive-behavioral dyscontrol are prominent. Although borderline patients in our study had significant histories of SSRI use, the prominence of affective dysregulation or impulsive-behavioral dyscontrol symptoms did not predict their utilization. The prescription of SSRIs may have been linked to the frequent presence of comorbid depression in patients with BPD. In fact, over 70% of the patients with BPD in the CLPS sample had a history of major depression (14).

In addition, even though the Guideline recommends neuroleptics as the initial pharmacological approach for cognitive-perceptual symptoms, impulsive-behavioral dyscontrol but not cognitive-perceptual symptoms predicted neuroleptic use. It may be that, in psychiatric practice, careful delineation of distinct symptom patterns has not been typical. Furthermore, the diagnosis of BPD alone may have led physicians to prescribe medications from multiple categories, including SSRIs and neuroleptics.

Symptoms of impulsive-behavioral dyscontrol predicted not only neuroleptic use, but also anticonvulsant use, and both classes of medications are recommended as alternative or augmentation strategies for this symptom cluster. Also, cognitive-perceptual symptoms were not preferentially treated with anticonvulsants, which is consistent with the APA Guideline. Finally, more seriously impaired patients in our study (i.e., patients with lower GAF scores indicating more impairment in functioning) were more likely to receive neuroleptics and anticonvulsants. This practice was not addressed in the Guideline, but it may reflect sound clinical judgment in deciding when to use adjunctive pharmacotherapy in patients with BPD.

It should be noted that the Practice Guideline algorithms have been the subject of some controversy. It has been observed that, while there has been some empirical work on medications for BPD, that body of inquiry has been somewhat sparse and preliminary in nature (15, 16). In addition, the nature of BPD and its response to medications is likely to be different from that of Axis I disorders. It has been argued that none of the medications that are currently suggested for BPD has been shown to be specifically effective over time for a majority of patients (16), which could also be linked to the potentially detrimental practice of polypharmacy observed in BPD (17). Nevertheless, it is hoped that the Guideline will stimulate more empirical clinical trials concerning the psychopharmacological component of treatment for patients with BPD.

Several potential limitations of the current study should be noted. First, we relied upon patient self-reports about medication use. It is possible that certain medications were prescribed but not actually taken by some of the patients. However, it is still of clinical interest to examine which medications BPD patients reported using. Retrospective reports of treatment obtained by interviewers using the LIFE interview have been shown to highly reliable (18). The LIFE has been used to report treatment received by patients with depressive (19) and anxiety (20) disorders in multi-site longitudinal studies similar to the CLPS. Recently, Posternak and Zimmerman demonstrated that, in general, patients were able to accurately recall their antidepressant treatment histories over a 5-year period (21).

A second limitation is that our approximation of the symptom clusters was based on the BPD criteria from the DIPD-IV, which were designed to assess the presence or absence of the disorder itself, and not to elaborate on specific sub-areas of phenomenology. Future prospective studies should more specifically measure the symptom clusters and also examine whether patients with BPD are treated according to standard algorithms, as physicians become more familiar with the Guideline.

Finally, previous experience with psychotropic medications and other co-occurring treatments may also have influenced the treatments selected by physicians in this sample in ways that may not have agreed with the recommendations in the Guideline. Certainly, patients with BPD have extensive experience with a variety of medications and other treatments, as documented by Bender et al. (2). Few patients in this study were treatment naïve.

In conclusion, in this prospective study of reported medication utilization, significant proportions of patients with BPD reported the use of major classes of psychotropic drugs recommended in the APA Practice Guideline for the Treatment of Borderline Personality Disorder.With the exception of symptoms of impulsive-behavioral dyscontrol, however, BPD symptom clusters did not predict medication utilization in line with the algorithms included in the Guideline. This may have been because this study examined medication utilization during the period before the Guideline was published and the Guideline may eventually impact clinical practice. It may also be the case that reported use does not correspond to physician prescribing practices and actual prescribing was more in line with the Guideline recommendations. Given the high frequency with which symptoms of affective dysregulation and impulsive-behavioral dyscontrol occur in patients with BPD, however, it seems more likely that prescribing practices and reported medication utilization are determined by other clinical factors, including prior experience with medications, the relative effectiveness of other treatments, comorbid Axis I disorders, and the severity of functional impairment, in addition to target symptomatology. Several of these hypotheses will be explored with data from a future prospective follow-up, which will examine prescribing practices after the publication of the Guideline.

(Reprinted with permission from the Journal of Psychiatric Practice 2004; 10(3):156–161)