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422 The APA Publishing Textbook of Mood Disorders, Second Edition
https://t.me/med1917
Conducting Interpersonal Psychotherapy
Techniques
IPT therapists define depression as a treatable medical illness that is not the patient’s fault. This definition displaces burdensome blame from the patient to the illness. It also provides hope for improvement: an illness is far more treatable than a self-perceived intrinsic flaw. The IPT therapist uses DSM-5 (American Psychiatric Association 2013) to diagnose a mood disorder and a rating scale such as the Hamilton Rating Scale for Depression (HAM-D; Hamilton 1960) or the Beck Depression Inventory (BDI; Beck
1978) to assess and explain depressive symptoms. These instruments provide psycho­education to help the patient to recognize that he or she is struggling with a common disorder with a predictable set of symptoms. The HAM-D and BDI have been used for decades, reinforcing that the problem is not a personal flaw but a long-recognized syn­drome. The therapist gives the depressed patient the sick role (Parsons 1951), which excuses what the illness prevents him or her from doing, while still conferring respon sibility to work in treatment to recover the lost healthy role. By solving an interper­sonal problem—addressing complicated bereavement, a role dispute or transition, or an interpersonal deficit—the IPT patient can both improve his or her life situation and relieve symptoms of the depressive episode. This coupled formula, validated in re­peated RCTs, can be offered with confidence and optimism.
IPT is an eclectic therapy that uses techniques seen in other treatment approaches yet can be clearly distinguished from other therapies by adherence ratings (Amole et al. 2017; Hill et al. 1992; Markowitz et al. 2000b). Its medical model of depressive ill ness mimics, and makes it highly compatible with, pharmacotherapy. Marital thera­pists find its approach to interpersonal issues familiar. IPT shares role-playing and a here-and-now focus with cognitive-behavioral therapy (CBT; Beck et al. 1979; Mar kowitz 2001). Akin to CBT as a time-limited, syndrome-targeted treatment, IPT is less structured, assigns no homework, and focuses on interpersonal problem areas and associated affect rather than automatic thoughts and core beliefs. Affect-focused, IPT overlaps with psychodynamic psychotherapies, and many early IPT research thera­pists came from psychodynamic backgrounds. Yet IPT also meaningfully differs from psychodynamic therapies in its focus on the present, not the past; its focus on real-life change rather than self-understanding; its medical model; and its avoidance of inter preting dreams and the transference (Markowitz et al. 1998b). No one technique or tactic makes IPT a unique and coherent approach; its overall strategies do.
Each of the four IPT interpersonal problem areas has discrete, if overlapping, goals for the therapist and patient to pursue. The therapist repeatedly helps the patient re late life events to mood and other symptoms. In each session after the first one, an opening question elicits an interval history of mood and events and focuses treatment on them. Other techniques include
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• Communication analysis—the reconstruction and evaluation of recent affectively
charged interpersonal encounters.
• Exploration of the patient’s wishes and options—to pursue these in interpersonal situ-
ations.
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• Decision analysis—to help the patient choose among options.
• Role-playing—to help patients rehearse tactics for real life.
IPT focuses on current interpersonal relationships in the patient’s immediate social context. The IPT therapist attempts to intervene in symptom formation and social dysfunction associated with depression rather than aspects of personality. Personal ity is difficult to accurately assess during an episode of a major psychiatric disorder such as depression (Hirschfeld et al. 1983; Markowitz et al. 2015). IPT does help the patient build new social skills (Weissman et al. 1974, 1981), which may be as valuable as changing personality traits.
Phases of Treatment
As an acute treatment, IPT has three phases (Table 24–1) (Weissman et al. 2018). The early phase, lasting no more than three sessions, sets the stage for what follows. The therapist reviews symptoms, diagnoses depression by standard criteria (American Psychiatric Association 2013), and gives the patient the sick role. The psychiatric his­tory includes an “interpersonal inventory,” a careful cataloging of the patient’s past and current social functioning and close relationships, including their patterns and mutual expectations. Initial sessions elucidate changes in relationships proximal to the onset of symptoms—for example, death of a loved one, children leaving home, worsening marital strife, or isolation from a confidant. The therapist looks for mean ingful life events such as a career change or onset of a medical illness. This review pro­vides a framework for understanding the social and interpersonal context of the depressive symptoms, and this framework becomes the basis of a treatment focus.
In clinical practice, the therapist assesses the need for medication on the basis of symptom severity, illness history and response to treatment, and patient preference. The therapist then educates the patient about the constellation of symptoms that de fine MDD, their psychosocial concomitants, and what the patient may expect from treatment. A formulation links the depressive syndrome to the patient’s interpersonal situation (Markowitz and Swartz 2007), centered on one of four interpersonal prob lem areas: 1) grief, 2) interpersonal role disputes, 3) role transitions, or 4) interper­sonal deficits (Table 24–2). With the patient’s explicit acceptance of this formulation as the treatment focus, therapy enters the middle phase.
Any formulation perforce simplifies a patient’s complex life story. Although many patients present with multiple interpersonal problems, the formulation isolates one or at most two salient problems related to the patient’s mood disorder, either as pre­cipitants or as consequences, and weaves them into an organizing fiction. More than two foci in a brief psychotherapy means no focus at all. Choice of focal problem area depends on clinical acumen, although research has shown that IPT therapists agree on the chosen areas (Markowitz et al. 2000a). Patients seem to find the foci credible.
In the middle phase, the IPT therapist pursues strategies appropriate to the focal inter- personal problem area (Weissman et al. 2018). To address grief (complicated bereave­ment after the death of a loved one), the therapist facilitates the catharsis of mourning and helps the patient to find new activities and relationships to compensate for the loss. For role disputes (conflicts with a spouse, other family member, boss, coworker, or friend), the therapist helps the patient to explore the relationship, the nature of the dis-
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424 The APA Publishing Textbook of Mood Disorders, Second Edition
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TABLE 24–1. Phases of interpersonal psychotherapy (IPT)
Early phase
Deal with the depression.
1. Review depressive symptoms.
2. Name the syndrome: formal diagnosis.
3. Provide psychoeducation about depression and its treatment.
4. Give the patient the “sick role.”
5. Evaluate the need for medication.
Relate depression to interpersonal context: interpersonal inventory.
1. Determine the nature of interaction with significant persons.
2. Identify reciprocal expectations of the patient and significant others and whether these were fulfilled.
3. Discuss satisfying and unsatisfying aspects of relationships.
4. Detect recent changes in key relationships.
5. Determine changes the patient desires in his or her relationships.
Identify the major problem area.
1. Determine problem area related to current episode and set treatment goals.
2. Identify which relationship is related to the episode and what might change in it.
Explain IPT concepts and contract.
1. Outline the therapist’s understanding of the problem: formulation.
2. Agree on treatment goals (focal problem area):
a. Brief treatment (time limit) b. Target of improving depression (not character)
3. Describe IPT procedures: here-and-now focus, need to discuss important concerns, review of current interpersonal relationships, discussion of practical aspects of treatment.
Middle phase
Use specific strategies for treating grief, role disputes, role transitions, or interpersonal deficits.
Termination phase
Consolidate gains. Foster independence. Address guilt (and blame the therapy) if the patient’s symptoms did not respond. Review risk of relapse and recurrence. Recontract for continuation or maintenance treatment if appropriate.
pute, whether it has reached an impasse, and available options to resolve it. If these op­tions fail, the therapist and patient may conclude that the relationship has reached an impasse and consider ways to change the impasse or to end the relationship.
A role transition is a change in life status: beginning or ending a relationship or ca­reer, moving, being promoted, retiring, graduating, or receiving a diagnosis of a med­ical illness. The patient learns to manage the change by mourning the loss of the old role while recognizing positive and negative aspects of the new role he or she is as­suming and taking steps to master it. The residual fourth IPT problem area, interper­sonal deficits, comprises patients who lack all of the first three problem areas (i.e., have no recent life events). This least-defined focus, an anomalous non-life-event-
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TABLE 24–2. Interpersonal psychotherapy problem areas
Problem area Definition
Grief (complicated bereavement) Death of a significant other Role disputes Struggle with a significant other Role transitions Life event that changes perceived social role Interpersonal deficits No life events; social isolation (used only if none of
the above are appropriate)
based category for a life-event-based therapy, defines the patient as lacking the social skills to initiate or sustain relationships. Its goal is to help the patient develop new re lationships and skills. Some patients who appear to fit this category may have DSM­IV (American Psychiatric Association 1994) dysthymic disorder, for which other IPT strategies have been developed (Markowitz 1998).
IPT sessions address current, here-and-now problems. Sessions open with the question “How have things been since we last met?” This orients the patient to recent interpersonal events and recent mood, which the therapist helps the patient to link. Therapists sympathize with patients’ suffering and validate their emotions while tak­ing an active, supportive, and hopeful stance to counter the depressed patient’s pes­simism. They elicit and emphasize the options for change in the patient’s life, options that the depressive episode often has kept the patient from seeing or exploring fully. Understanding the situation does not suffice; therapists stress the need for patients to test these options to improve their lives and simultaneously treat their depressive epi sodes. Enacting a practical solution to the patient’s focal interpersonal crisis within the envelope of the time-limited treatment is the implicit homework of IPT.
The termination phase of IPT, the last few sessions of acute treatment or last months of maintenance treatment, supports the patient’s newly regained sense of competence by recognizing and consolidating therapeutic gains. The therapist enhances the pa­tient’s self-esteem and independence by underscoring that the patient’s depressive episode has improved through the patient’s interpersonal actions in changing a life situation. Moreover, the patient achieved this at a time when he or she had felt weak­est. The therapist also helps the patient to anticipate triggers for and responses to de­pressive symptoms that might arise in the future. Relative to psychodynamic therapy, IPT deemphasizes termination: it is a graduation from successful treatment, a role transition that, like most, is bittersweet. The sadness of separation is distinguished from depressive feelings. If the patient has not improved, the therapist emphasizes that the treatment has failed, not the patient, and that alternative effective treatment options exist. Patients with multiple prior depressive episodes or significant residual symptoms who successfully complete acute treatment but remain at high risk for re­currence may contract for maintenance therapy as acute treatment draws to a close.
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Indications and Contraindications
Research on psychotherapy outcome has lacked the resources available to pharma­ceutical companies, whose products are accordingly better studied. Nonetheless, a
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series of RCTs comparing IPT with control conditions have defined the efficacy of IPT for patients with mood disorders. Indications for IPT thus have been determined not by random application but by RCTs. For some patient subgroups, IPT has been adapted in separate treatment manuals (e.g., Markowitz 1998; Mufson et al. 2011).
Still more interesting are comparative trials of IPT with CBT and medication, which have provided some data on differential therapeutics. No absolute contraindications exist for using IPT with nondelusional depressed outpatients, yet no treatment is ideal for all patients. Given a choice between two treatments of already established efficacy, the clinician must determine which factors may predict a better outcome for patients with a given diagnosis (Frances et al. 1984). The following section documents the ef ficacy of IPT for patients with unipolar, nondelusional mood disorders, first address­ing acute and then chronic forms of depression (Table 24–3).
Acute Treatment of Major Depressive Disorder
IPT was first studied as an acute antidepressant treatment in a four-cell, 16-week ran­domized trial comparing IPT, amitriptyline, their combination, and a nonscheduled control treatment for 81 outpatients with MDD (DiMascio et al. 1979; Weissman et al.
1979). Amitriptyline worked more quickly, but IPT and amitriptyline did not signifi­cantly differ in symptom reduction at the end of treatment. Each reduced symptoms more efficaciously than did the control treatment, and combined amitriptyline-IPT was more efficacious than either active monotherapy. Not surprisingly, patients with psychotic depression who received IPT alone fared poorly. On naturalistic follow-up at 1 year, many patients had sustained improvement from the brief IPT intervention, and IPT patients had developed significantly better psychosocial functioning regard­less of whether they had received medication. This effect on social function was not found for amitriptyline alone, nor had it been evident for IPT immediately after the 16-week trial (Weissman et al. 1981).
In the ambitious, multisite NIMH Treatment of Depression Collaborative Research Program (Elkin et al. 1989), investigators randomly assigned 250 outpatients with MDD to 16 weeks of IPT, CBT, or clinical management with either imipramine or pill placebo. Most subjects completed at least 15 weeks or 12 treatment sessions. More mildly depressed patients (defined as baseline 17-item HAM-D score<20) improved equally in all treatments. Among more severely depressed patients (HAM-D score ≥20), imipramine worked fastest and most consistently outperformed placebo. IPT was comparable to imipramine on several outcome measures, including HAM-D score, and superior to placebo for the more depressed patients. CBT was not superior to placebo among the more depressed patients.
Klein and Ross (1993) reanalyzed the NIMH Treatment of Depression Collaborative Research Program data with the Johnson-Neyman technique and found that medica­tion outperformed the psychotherapies, which were superior to placebo, especially among more impaired patients. The authors found CBT inferior to IPT for patients with BDI scores greater than 30, a score demarcating the boundary between moderate and severe depression.
In a naturalistic follow-up study of Treatment of Depression Collaborative Re­search Program subjects at 18 months posttreatment, Shea et al. (1992) found no sig­nificant difference across treatments in recovery among patients whose symptoms
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TABLE 24–3. Empirically based indications for interpersonal psychotherapy
Acute major depressive disorder
Geriatric patients Adolescent patients HIV-positive patients Primary care patients Antepartum and postpartum depressed women
Patients with marital disputes (conjoint therapy) Recurrent major depressive disorder (maintenance prophylaxis) Persistent depressive disorder (dysthymia) Bipolar disorder (adjunctive treatment) Interpersonal counseling for subsyndromal depression
a
Preliminary results are encouraging.
b
See Chapter 26 (“Psychotherapeutic Approaches to Bipolar Disorder”) in this volume.
a
a,b
had remitted (i.e., those who had minimal or no symptoms after treatment and sus­tained this improvement during follow-up). Thirty percent of CBT, 26% of IPT, 20% of placebo, and 19% of imipramine subjects whose symptoms had acutely remitted remained in remission during that time span. Of the subjects whose symptoms had acutely remitted, relapse rates over the 18 months were 36% for CBT, 33% for IPT, 50% for imipramine (albeit medication had been stopped at 16 weeks), and 33% for pla­cebo. The authors concluded that for many patients, 16 weeks of treatment was insuf­ficient to achieve lasting recovery (Shea et al. 1992).
IPT works outside the United States as well. In a trial in the Hague, the Nether-
lands, Blom et al. (1996) first undertook a pilot trial and then completed a randomized trial of IPT, nefazodone, and their combination for 191 subjects with MDD (Blom et al. 2004). Results suggested that all three treatments had similar benefit. Subsequent trials have validated the efficacy of IPT for depression in many other countries (Weissman et al. 2018).
Depressed Geriatric Patients
IPT was first used with 30 depressed geriatric patients to enhance compliance in a 6­week pharmacotherapy trial and to enhance the pill placebo control group (Rothblum et al. 1982; Sholomskas et al. 1983). The investigators noted grief and role transitions as the modal treatment foci. They suggested modifications of IPT for older depressed patients, including a flexible duration of sessions, more practical advice and concrete support (e.g., arranging transportation, calling physicians), and increased recognition that major role changes may be impractical and detrimental (e.g., divorce at age 75 years). A 6-week trial comparing IPT with nortriptyline in depressed elderly patients showed some advantages for IPT, largely because of higher attrition in the medication group because of nortriptyline’s side effects (Sloane et al. 1985).
Depressed Adolescents
Mufson et al. (1993) modified IPT to incorporate adolescent developmental issues. The researchers conducted an open feasibility and follow-up trial and then a con-
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trolled 12-week clinical trial comparing IPT for depressed adolescents (IPT-A) and clinical monitoring in 48 clinic-referred adolescents, ages 12–18, whose symptoms met DSM-III-R (American Psychiatric Association 1987) criteria for MDD. Patients were rated biweekly by a blinded independent evaluator to assess symptomatology, social functioning, and social problem-solving skills. Of the 48 patients, 32 (21 IPT-A, 11 control) completed the protocol.
Patients receiving IPT-A reported significantly greater improvement in depressive symptoms and social functioning, including functioning with friends and problem­solving skills. In the intent-to-treat sample, 75% of the IPT-A patients met the recov ery criterion (HAM-D score ≤6), compared with 46% of the control subjects. The find­ings support the feasibility, patient acceptance, and efficacy of 12 weeks of IPT-A with acutely depressed adolescents in reducing depressive symptomatology and improv ing social functioning and interpersonal problem-solving skills (Mufson et al. 1999).
Mufson et al. (2004a) subsequently tested IPT-A in a large-scale effectiveness study in New York City school-based clinics; a 12-session course of IPT-A delivered by school counselors was compared with treatment as usual over 16 weeks. Adolescents with mood disorders who received IPT-A (N=63) again showed greater improve ments than did those receiving usual treatment on independent, clinician, and self­report ratings of symptoms and social functioning. Thus, IPT-A has shown benefits in both efficacy and effectiveness trials. Mufson et al. (2004b) also have developed a group format for depressed adolescents, which might have economic benefits and take advantage of teenage peer support.
Rosselló and Bernal (1999) at the University of Puerto Rico compared IPT (n=22), CBT (n=25), and a wait-list control condition (n=24) in a 12-week RCT for adolescents (ages 13–18 years) whose symptoms met DSM-III-R criteria for MDD, dysthymia, or both. The investigators did not use Mufson and colleagues’ IPT-A adaptation. Both IPT and CBT were more efficacious than the wait-list condition in reducing adoles­cents’ self-rated depressive symptoms. IPT was more efficacious than CBT in increas­ing self-esteem and social adaptation. Effect sizes for improvement were 0.73 for IPT and 0.43 for CBT.
Mufson and colleagues have since adapted IPT-A as a group intervention, as a pre­ventive intervention, and as an intervention for preadolescents (Weissman et al. 2018).
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Depressed HIV-Positive Patients
Markowitz et al. (1992) modified IPT for depressed individuals with HIV (IPT-HIV) in the early years of the epidemic, when AIDS appeared to be an acute and lethal ill­ness rather than the chronic disease it has now become. The adaptation emphasized common concerns among this population about illness and death, grief, and role tran sitions. A 16-week randomized trial in 101 subjects compared IPT-HIV, CBT, support­ive psychotherapy, and imipramine plus supportive psychotherapy (Markowitz et al. 1998a). As with the subset of more severely depressed individuals in the Treatment of Depression Collaborative Research Program study (Elkin et al. 1989), all treatments were associated with symptom reduction, but IPT and imipramine plus supportive psychotherapy produced significantly greater symptomatic and functional improve­ment than CBT or supportive psychotherapy alone. Many patients reported improve­ment in neurovegetative symptoms that they had mistakenly attributed to HIV infection.
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More recently, Heckman et al. (2017) successfully used telephone IPT to treat iso-
lated rural patients with comorbid depression and HIV infection.
Depressed Primary Care Patients
Schulberg et al. (1996) compared IPT with pharmacotherapy for depressed primary care medical patients. The investigators integrated IPT into the primary care center. Not only did nurses take vital signs before sessions, but primary care patients re ceived treatment for MDD without having to go to a “shrink”: the mental health care came to them. If patients were medically hospitalized, attempts were made to con tinue IPT in the hospital.
Patients with MDD (N=276) were randomly assigned to receive IPT, nortriptyline, or their primary care physicians’ usual care. IPT was given weekly for 16 weeks and then monthly for 4 months (Schulberg et al. 1996). Depressive symptoms declined more rapidly with either nortriptyline or IPT than with usual care. About 70% of those who completed the trial who had received nortriptyline or IPT, but only 20% of those who had received usual care, had recovered after 8 months. Subjects with a his­tory of comorbid panic disorder had a poorer response across treatments than did those without a panic history (C. Brown et al. 1996), a finding subsequently corrobo rated by Frank et al. (2000).
Patients With Antepartum and Postpartum Depression
Pregnancy and nursing are key role transitions for women of childbearing age, who are prime candidates for depressive episodes (see Women,” in this volume). Even though most antidepressant medications may carry little risk of teratogenesis and not all are detectable in breast milk, physicians are re luctant to prescribe medication, and patients are reluctant to accept it, during preg­nancy and nursing. Thus, peripartum depression is an ideal target for IPT.
Spinelli (1997) at Columbia University tested IPT in women with antepartum de­pression. She added “complicated pregnancy” as a fifth interpersonal problem area. Timing and duration of sessions were adjusted in response to bed rest, delivery, ob stetrical complications, and childcare. As with depressed HIV-positive and primary care patients, telephone sessions and hospital visits were sometimes necessary (Spi nelli 1997). In a 16-week trial, Spinelli et al. (2016) found that IPT had greater efficacy than a control parenting education condition in treating women of generally low so cioeconomic status with moderately severe depression.
O’Hara et al. (2000) compared IPT with a wait-list control condition in 120 women with postpartum depression in a 12-week trial with an 18-month follow-up. The re­search assessed both the symptom states of the postpartum mothers and their inter­actions with their infants (Stuart and O’Hara 1995). Of the IPT group, 38% met HAM­D and 44% met BDI remission criteria, compared with 14% on each measure for the control group. Sixty percent of IPT patients, in contrast to 16% of control subjects, re ported more than a 50% reduction in BDI score. Mothers receiving IPT showed sig­nificantly improved social adjustment relative to the control group.
Klier et al. (2001) treated 17 women with postpartum depression in nine weekly 90­minute group IPT sessions followed by an hourlong individual termination session. Scores on the 21-item HAM-D declined from 19.7 to 8.0, suggesting the efficacy of this approach. In an exciting study of IPT as prevention, Zlotnick et al. (2001) treated 37
Chapter 42, “Depression in
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women at risk for postpartum depression with either four 60-minute sessions of an IPT-based group or usual care. Six of the 18 women in usual care developed depres sion by 3 months postpartum, compared with none of the 17 IPT group patients.
Depressed Patients With Marital Disputes (Conjoint IPT)
Stressful changes in relationships such as marital conflict, separation, and divorce can precipitate or complicate depressive episodes (Rounsaville et al. 1979). Treating mar ital role disputes in individual IPT often has the feel of unilateral couples therapy (Weissman et al. 2000), so extending IPT to a couples format was not difficult. Weiss man and Klerman (1993) developed a manual for conjoint therapy for depressed pa­tients with marital disputes (IPT-CM). IPT-CM includes the spouse in all sessions and focuses on the current marital dispute. Eighteen patients with MDD linked to onset or exacerbation of marital disputes were randomly assigned to 16 weeks of either in dividual IPT or IPT-CM. Patients showed similar reductions in depressive symptoms in both treatments, but patients receiving IPT-CM reported significantly better mari tal adjustment, marital affection, and sexual relationships (Foley et al. 1989). These pi­lot findings require replication with a larger sample and other control groups.
Maintenance Prophylaxis for Recurrent Major Depressive Disorder
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A significant proportion of all depressions are chronic, and this chronicity may take two forms. First, most individuals who have a single episode of MDD have a greater than even chance of having a second lifetime episode; the more episodes one has, the greater the risk of subsequent episodes (Boland and Keller 2002). Patients with recur­rent MDD require not only acute remission of symptoms but also prevention of relapse and recurrence. IPT is the first psychotherapy to have been tested as a maintenance treatment to prevent recurrence of depressive episodes. Second, many depressive epi­sodes are chronic—either chronic MDD, milder but chronic DSM-IV dysthymic disor­der, or so-called double depression (i.e., MDD superimposed on DSM-IV dysthymic disorder); DSM-5 has reclassified all of these under the rubric of “persistent depressive disorder (dysthymia).” Chronically depressed patients are still more hopeless and re­signed than are acutely depressed patients, and the chronicity of their illness alters treatment strategies for their acute treatment.
IPT was first tested in an 8-month, six-cell trial (Klerman et al. 1974; Paykel et al.
1976). A study of this length today would be considered a continuation treatment be­cause the concept of long-term maintenance antidepressant treatment has lengthened. Acutely depressed outpatient women (N=150) who had responded (with 50% or greater symptom reduction by interviewer rating) to a 4- to 6-week acute trial of amitriptyline were randomly assigned to 8 months of weekly IPT, amitriptyline, placebo alone, com­bined IPT-amitriptyline, combined IPT-placebo, or no treatment. Randomization to IPT or a low-contact psychotherapy condition occurred at entry into the continuation phase, whereas randomization to medication, placebo, or no treatment occurred at the end of the second month of continuation treatment. Maintenance pharmacotherapy was found to prevent relapse and symptom exacerbation, whereas IPT improved social functioning (Weissman et al. 1974). The effects of IPT on social functioning required 6–8 months to appear. Combined psychotherapy and pharmacotherapy produced the best outcomes.
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Researchers in Pittsburgh, Pennsylvania, conducted two longer antidepressant maintenance trials of IPT (IPT-M). Frank et al. (1990, 1991) studied 128 outpatients with multiply and rapidly recurrent depression. Patients were given combined high-dosage (>200 mg/day) imipramine and weekly IPT until they responded; the high-dosage medication was continued while IPT was tapered to a monthly frequency during a 4-month continuation phase. Patients who remained in remission were then randomly assigned to 3 years of 1) ongoing high-dosage imipramine plus clinical management,
2) high-dosage imipramine plus monthly IPT, 3) monthly IPT alone, 4) monthly IPT plus placebo, or 5) placebo plus clinical management. High-dosage imipramine, with or without further IPT, proved most efficacious, protecting more than 80% of the pa tients over 3 years. Most placebo patients relapsed within the first few months. Once­monthly IPT, although less efficacious than medication, was statistically and clinically superior to the control condition in this high-risk patient population.
Reynolds et al. (1999) conducted a second 3-year maintenance study of geriatric patients with recurrent depression; they used IPT and nortriptyline in a design simi lar to that used in the Frank et al. (1990) study. The IPT manual was modified to allow more flexibility in the length of sessions, under the assumption that some elderly pa tients might have difficulty tolerating 50-minute sessions. The investigators found that geriatric patients needed to address early life relationships in psychotherapy, digress ing from the here-and-now focus of IPT. Like Sholomskas et al. (1983), Reynolds and colleagues believed that therapists needed to help patients solve practical problems but acknowledged that some problems might not be resolvable, such as existential late-life issues or lifelong psychopathology (Rothblum et al. 1982). Elderly depressed patients whose sleep quality had normalized by the early continuation phase had an 80% chance of remaining well during the first year of maintenance treatment. Re­sponse rates were similar for patients who subsequently received either nortriptyline or IPT (Reynolds et al. 1999).
The acute treatment sample comprised 187 patients 60 years or older with recur­rent MDD (Reynolds et al. 1999). These patients received combined IPT and nortripty­line. One hundred seven who had remission of symptoms and then achieved recovery after continuation therapy were randomly assigned to one of four 3-year maintenance conditions: 1) medication clinic with nortriptyline alone, with steady-state nortripty­line plasma levels maintained in a therapeutic window of 80–120 ng/mL; 2) medica­tion clinic with placebo; 3) monthly maintenance IPT plus placebo; or 4) monthly maintenance IPT plus nortriptyline. Recurrence rates were 90% for placebo, 64% for IPT with placebo, 43% for nortriptyline alone, and 20% for combined treatment. Each monotherapy was statistically superior to placebo, whereas combined therapy showed superiority to IPT alone and a trend for superiority to nortriptyline alone. Patients in their 70s were more likely to have a recurrence, and to do so more quickly, than patients in their 60s. This study (Reynolds et al. 1999) corroborated the maintenance findings of Frank et al. (1990, 1991), with the difference that combined treatment showed ad­vantages over pharmacotherapy alone for the geriatric population.
In both maintenance studies, the comparison of high-dosage tricyclic antidepres­sants with low-dose maintenance IPT is easy to misinterpret. No previous maintenance studies had ever used either such high dosages of medication or so low a dose of psy­chotherapy. Had the medication dosage been lowered comparably to the reduced psy­chotherapy dosage, recurrence in the medication groups might well have been greater;
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