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Intensive short-term dynamic psychotherapy (ISTDP) is a form of short-term psychotherapy developed through empirical, video-recorded research by Habib Davanloo, MD. 
ISTDP's primary goal is to help the patient overcome internal resistance to experiencing true feelings about the present and past which have been warded off because they are either too frightening or too painful. The technique is intensive in that it aims to help the patient experience these warded-off feelings to the maximum degree possible; it is short-term in that it tries to achieve this experience as quickly as possible; it is dynamic because it involves working with unconscious forces and transference feelings.
Patients come to therapy because of either symptoms or interpersonal difficulties. Symptoms include traditional psychological problems like anxiety and depression, but they also include medically unexplained symptoms such as headache, shortness of breath, diarrhea, or sudden weakness. "Medically unexplained" in this instance means symptoms occur without any medically identifiable cause. These are theorized, within the ISTDP model, to occur in distressing situations where painful or forbidden emotions are triggered outside of awareness. Within psychiatry, these phenomena are classified as "Somatoform Disorders" in DSM-IV-TR.
The therapy itself was developed during the 1960s to 1990s by Habib Davanloo, a psychiatrist and psychoanalyst from Montreal who grew frustrated with the length and limited efficacy of psychoanalysis. He video recorded patient sessions and watched the recordings in minute detail to determine as precisely as possible what sorts of interventions were most effective in overcoming resistance, which acts to keep painful or frightening feelings out of awareness and prevent interpersonal closeness.
ISTDP is taught by Habib Davanaloo at McGill University. ISTDP is also taught in other University and post-graduate settings around the world. An example of ISTDP training in a University setting is the ISTDP training program at the Center for Emotions and Health at Dalhousie University, run by Allan Abbass, MD. An example of post-graduate ISTDP training is the ISTDP Institute, run by Jon Frederickson, MSW. The ISTDP Institute offers on-line ISTDP training materials, including introductory videos and skill-building exercises.
In 1895, Josef Breuer and Sigmund Freud published their Studies on Hysteria, which looked at a series of case studies where patients presented with dramatic neurological symptoms, such as "Anna O" who suffered headaches, partial paralysis, loss of sensation, and visual disturbances. These symptoms did not conform to known patterns of neurological disease, and neurologists were thus unable to account for symptoms in purely anatomical or physiological terms. Breuer's breakthrough was the discovery that symptomatic relief could be brought about by encouraging patients to speak freely about emotionally difficult aspects of their lives. Experiencing these emotions which had been previously outside of awareness seemed to be the curative factor. This cure became known as catharsis, and the experiencing of the previously forbidden or painful emotion was abreaction.
Freud tried various techniques to deal with the fact that patients generally seemed resistant to experiencing painful feelings. He moved from hypnosis to free association, interpretation of resistance, and dream interpretation. With each step, therapy became longer. Freud himself was quite open about the possibility that there were many patients for whom analysis could bring little or no relief, and he discusses the factors in his 1937 paper "Analysis Terminable and Interminable."
From the 1930s through the 1950s, numerous analysts were engaged with the question of how to shorten the course of therapy but still achieve therapeutic effectiveness. These included Sándor Ferenczi, Franz Alexander, Peter Sifneos, David Malan, and Habib Davanloo. One of the first discoveries was that the patients who tended to benefit the most greatly from therapy were those who could rapidly engage, could describe a specific therapeutic focus, and could quickly move to an experience of their previously warded-off feelings. These also happened to represent those patients who were the healthiest to begin with and therefore had the least need for the therapy being offered. Clinical research revealed that these patients were able to benefit because they were the least resistant. They were the least resistant because they were the least traumatised and therefore had the smallest burden of repressed emotion. However, among the patients coming to the clinic for various problems, the rapid responders represented only a small minority. The vast bulk of patients coming for treatment remained unreachable with the newly developing techniques.
It became commonly recognised among the short-term dynamic researchers that overcoming resistance was the chief task of psychotherapeutic research. Toward this end, Dr. David Malan promulgated a model of resistance, known as the Triangle of Conflict first proposed by Ezriel. At the bottom of the triangle are the patient's true, impulse-laden feelings, outside of conscious awareness. When those emotions rise to a certain degree and threaten to break into conscious awareness, they trigger anxiety. The patient manages this anxiety by deploying defences, which lessen anxiety by pushing emotions back into the unconscious.
The emotions at the bottom of Malan's Triangle of Conflict originate in the patient's past, and Malan's second triangle, the Triangle of Persons, originally proposed by Menninger, explains that old emotions generated from the past are triggered in current relationships and also get triggered in the relationship with the therapist. The question of how maladaptive patterns of interpersonal behaviour could arise from early childhood experiences in the family of origin was postulated within psychoanalytic theory. Independent empirical support came from Bowlby's newly arising field of Attachment Theory.
John Bowlby, a British psychiatrist and psychoanalyst, was very interested in the impact on a child of adverse experiences in relation to its primary attachment figures (usually the mother, but often the father and others) in early life. He concluded, in opposition to received psychoanalytic dogma of the day, that childhood experience was far more important than unconscious fantasy. He also elucidated the nature of attachment, a system of behaviours exhibited by human and other mammalian infants which are innate and have the goal of physical proximity to the mother. For instance, a child taken out of its mother's arms cries loudly in protest, and it is only quieted by being restored to its mother's arms. Bowlby observed that the innate attachment system would be activated by loss of proximity to the mother, and that long-lasting trauma to the child could result from attachment interruption. Long term consequences included increased propensity to psychiatric disorders, poor relationship function, and decreased life satisfaction.
Bowlby conducted numerous studies and noted strong correlations between adverse early-life circumstances—primarily the lack of a consistent and nurturing relationship with the mother—as the source of numerous difficulties, including persistent depression, anxiety, or delinquency in adulthood. Childhood traumatisation to the attachment bond, usually through separation from or loss of the primary mother or mother-substitute, led to adult difficulties. Later attachment researchers using more sophisticated techniques found that the relationship between early attachment difficulties and adult psychopathology is quite weak.
In the 1960s, while Bowlby was observing children directly, Davanloo was beginning his work with symptomatic and character-disturbed adults. As he began his video-recording work and became progressively successful against higher levels of resistance, he noted that particular themes reappeared with striking consistency in patient after patient.
First, the therapist's efforts to get to know the patient's true feelings often aroused a simultaneous mixed feeling in the patient, composed of deep appreciation for the therapist's relentless efforts to get to know the patient deeply, combined with equally deep irritation at the therapist for challenging the patient to abandon long-held resistances which could thwart the therapeutic effort.
Davanloo noted, in concert with Malan's Triangle of Conflict, that patients would unconsciously resist the therapist's efforts to get to the root of their difficulties. He also observed, from his videotaped sessions, that patients would simultaneously send off signals of their unconscious anxiety. Davanloo carefully monitored these signals of anxiety and saw that they represented the rise of complex mixed feelings with the therapist. The mix represented that part of the patient seeking relief from painful symptoms but also an active desire to avoid painful, repressed feelings.
As Davanloo became more skilled at unlocking the patient's true unconscious feelings, he noted an often very predictable sequence of feelings. The sequence was by no means invariable, but it occurred frequently enough to allow the therapist to hypothesise its existence in a majority of cases.
First, after a high rise of mixed feeling with the therapist, manifested as signals of intense anxiety (tension in skeletal muscle, often manifested as wringing of the hands, accompanied with deep, sighing respirations), there would often be a breakthrough of rage, accompanied by an immediate drop in anxiety. This rage, Davanloo discovered, is intensely felt. It often has a violent impulse associated with it, sometimes even a murderous impulse. Once patients feel this rage, they are able to describe vividly detailed fantasies of what the rage would do if it were to take on a life of its own.
The rage is a product of thwarted efforts to attach from the past. Those thwarted efforts to love and be loved yield pain, in the form of what Bowlby described as protest. The pain yields a reactive rage at the loved person who thwarted attachment efforts.
Complete experiencing of the rageful impulse is typically accompanied by a tremendous relief at finally getting something out which has yearned for release. However, the relief is typically short lived.
Next, Davanloo almost invariably noted that patients then experience a tremendous wave of guilt about the rage. The guilt is a product of the fact that the old rageful feelings were with a person who was also loved. It is this guilt, Davanloo discovered, which is the key ingredient in symptom formation and character difficulties. Symptoms and interpersonal difficulties (usually unconscious efforts to ward off intimacy and closeness) are the product of guilt, which turns the rage back on the self. For instance, the rage of a two-year-old toward a mother who dies may be experienced in the present as suicidal feelings (self-directed murderous rage).
Beneath the guilty feelings from the past, Davanloo almost invariably noted painful feelings about thwarted efforts at emotional closeness to parents and others in childhood. Finally, at the deepest layer of feelings are the still powerful yearnings for closeness, attachment, and love.
The goal of the ISTDP therapist is, as rapidly as possible, to help the patient overcome resistance, and then experience all the waves of mixed, genuine feeling, previously unconscious, triggered by the intense therapeutic process. Those feelings are traced back to their origins in the past, and then both therapist and patient come to understand how the patient came to be the "consciously confused, unconsciously driven" person in the present. Old pockets of emotion are drained, the patient has a clearer self-narrative, and self-destructive symptoms and defences are renounced. The understanding gained is not just cognitive, but goes to the fundamental, emotional core. The influence of Freud's early trauma theory is evident.
Davanloo discovered the layers of the dynamic unconscious through a process of developing specific interventions which allow the therapist to reach those layers. Those interventions, applied in a specific fashion at specific times in the therapeutic process, are all calculated to overcome the patient's resistance as quickly and completely as possible, to allow the earliest and fullest experience of true feelings about the present and past as quickly as possible. Those interventions are known as pressure, challenge, and head-on collision.
Pressure is the principal ingredient of ISTDP, and it takes many forms. Initially, pressure takes the form of encouraging the patient to describe symptoms and interpersonal difficulties as specifically as possible, so both patient and therapist get the clearest picture possible of the precise difficulties. It starts from the moment the patient walks into the room, in the form of the question, "Are there some difficulties you are experiencing which you would like us to have a look at?"
The primary form of pressure is pressure toward feeling. Again, this is exerted mainly in the form of questions, such as, "How did you feel toward your boss for humiliating you in front of your staff? We see that you got anxious and depressed, but how did you feel?"
Pressure can be toward the patient's will: "Can we look to your feelings? Do you want us to look to your feelings?"
Pressure is also exerted toward the therapeutic task: "Our goal here, if you want, is to get to the root, the engine, driving your difficulties. So, can we look at a specific time when you experienced anxiety? This will give us a clear picture of the problem which we can use to get to the engine."
In its essence, pressure is encouragement from the therapist to the patient. It is encouragement to renounce defences, tolerate anxiety, and walk, with the therapist, into those places which have previously been off-limits. It is a way of saying, "There's nothing in there we cannot face together, and we do so in your service, to relieve you of painful difficulties."
Patients with low resistance are often quite responsive to pressure alone. However, as explained above, those are the patients who are healthiest to begin with. For patients with higher levels of resistance, usually the product of a more traumatised early phase of life, pressure quickly leads to the patient erecting barriers with the therapist. Those barriers are the patient's habitual defences against avoided feelings. The combination of intentional (conscious) and unintentional (unconscious) defences is called the resistance. The therapist is constantly monitoring for both the rise in anxiety and the appearance of resistance. When resistance does make its appearance, new interventions, in addition to pressure, are called for.
Challenge is a two-stage process. The first stage is clarification, which is the therapist's effort to confirm that resistance is operating, and also to acquaint the patient with the specific defence being deployed. Patients are often quite unaware of their own defences. Clarification takes the form of a question, meant to clarify the defence to both patient and therapist: "Do you notice that when you speak of being angry with your boss that you smile and giggle? Is a smile something you sometimes do to cover up a deeper feeling?"
When a defence is properly clarified, both patient and therapist can work together against it, because it represents an obstacle to the therapeutic task of getting to the patient's true feelings. A defence which has not been clarified is still invisible to the patient.
Challenge to the defences represents an exhortation to the patient to abandon the defence: "Again you smile when I ask you about feelings in relation to being humiliated by your husband. If you don't smile, how were you truly feeling?" This particular intervention is a very powerful one in the therapist's arsenal. As with all powerful interventions, if it is misapplied, the consequences can be severe: rapid misalliance with the therapist, worsening of symptoms, and treatment dropout. This is because the patient perceives a premature challenge, applied when a defence has not been clarified, as a criticism or a personal attack.
A common misunderstanding of ISTDP is that the therapist's role is to badger the patient through the use of Challenge. However, the proper use of challenge is as an aid or enhancement to the therapeutic alliance by removing an obstacle to the rise in complex feelings with the therapist. If challenge originates as a product of frustration in the therapist or as a misunderstanding of the unconscious, then stalemate is virtually assured.
The main purpose of challenge is to remove any obstacles in the way of the mutually agreed upon task of getting to the engine of the patient's present difficulties: warded-off, complex feelings in relation to traumatising experiences with important attachment figures in the past.
The majority of patients are able to experience their true mixed feelings with a combination of Pressure and properly clarified Challenge. However, a sizeable minority of patients erect a massive wall of resistance with the therapist. This wall is erected automatically and is an over-learned, habitual response, used to avoid emotional intimacy, both with the therapist and with other important figures in the patient's personal orbit. When the therapist observes that the patient's resistance has fully crystallised, it is time to deploy the ultimate intervention.
The Head-on Collision is an intervention aimed not at any single defence but rather aimed at the entire defensive structure being deployed by the patient. It is an urgent appeal to the patient to exert maximal effort to overcome the resistance, and it takes the form of a summary statement to the patient which explains the consequences of continuing to resist:
Let's take a look at what's happening here. You have come on your own free will, because you are experiencing a problem which causes you pain. We have set out to get to the root of your difficulties, but every time we attempt to move toward it, you put up this massive wall. The wall keeps me out, and it keeps you from knowing your own true feelings. If you keep me out, you keep me useless. Is that what you want? Because, as you see, you are certainly capable of keeping me useless to you. My first question is, why would you want me to be useless? You see, the consequences of this would be that I would be unable to help you. I'd like to, but the nature of this work is that I can't help everyone. Sometimes I fail. However, can you afford to fail? How much longer do you want to carry this burden?
This complex intervention is simultaneously aimed at the patient's will, is a reminder of the task, and is a wake-up call to the therapeutic alliance to exert maximal effort against the resistance. It is a reminder, in stark terms, that the therapeutic task is in jeopardy and may well fail. Finally, it is a reminder to the patient of the consequences of failure, as well as an implied reminder that success is also possible.
The interventions of Pressure, Challenge, and Head-on Collision, all aimed at helping the patient experience true feelings in relation to the present and past, allowed Davanloo to expand the scope of patients who can be helped by short-term psychodynamic psychotherapy. A model which initially worked only with highly motivated patients able to describe a clearly problematic area can now be applied to patients whose difficulties are diffuse and whose motivation is also initially quite diffuse. The results are deep, lasting changes in areas of both symptomatic and interpersonal disturbances.
It is also worth stressing that ISTDP, unlike traditional psychodynamic therapies, assiduously avoids interpretation until such time as the unconscious is open. The use of trial interpretations is explicitly avoided. The phase of interpretation only commences once it is clear to both therapist and patient that there has been a passage of previously unconscious emotion. Quite often, it is then the patient who takes the lead in interpreting: "The incredible rage I felt toward you when you refused to let me off the hook regarding my feelings is exactly the same rage that I felt toward my father when I was five years old and found out he had been killed in the war and wasn't coming home. I buried the rage that day because I felt so guilty about it. That's the day I became depressed."
Davanloo's initial research was published in the form of a qualitative case series of approximately 200 patients. He maintains a large video library of treated cases which he uses for teaching conferences. In the future, this library of clinical data may be made available to psychotherapy researchers who can independently verify and quantify Davanloo's claims. He claims efficacy with psychological symptoms, medically unexplained symptoms (so-called functional or somatoform disorders), and characterological disturbances (referred to as Personality Disorders in DSM).
Empirical research into the efficacy of ISTDP, and other brief psychodynamic psychotherapies is active. There are now over 25 published outcome studies in ISTDP. Twenty-one of these were recently reviewed by Dr Allan Abbass and colleagues and published in Harvard Review of Psychiatry, 2012. These include 8 randomized controlled trials, 15 case series and 2 non randomized controlled trials. Unfortunately, most of these studies do not distinguish ISTDP from other forms of short-term dynamic psychotherapy. There are also numerous studies showing the cost effectiveness of the method through reducing doctor visits, medication costs, hospital costs and disability costs. ISTDP has been investigated for:
There is also a Cochrane systematic review examining the efficacy of short-term psychodynamic psychotherapies for common mental disorders. Again, not distinguishing very different forms of STDP from Davanloo's ISTDP.  Neuroscientist and Nobel Prize winner, Eric Kandel refers to Davanloo's technique and its effectiveness in providing relief from emotional disturbances.
Cognitive Behavioral Therapy (CBT), developed by Aaron T. Beck, focuses on illogical thoughts as the main driver of emotional difficulties. These beliefs, such as, "Everything I attempt inevitably fails," are postulated to cause emotional states like depression or hopelessness. The therapist collaborates with the patient to determine which faulty cognitions are currently accepted by the patient as true. Together, the patient and therapist discover these cognitions and collaboratively explore the evidence for and against them. Relief of symptoms comes from replacing unfounded cognitions with more reality-based thoughts. CBT has been shown effective in numerous trials, particularly for depression and anxiety disorders.
While ISTDP accepts the presence of faulty cognitions, the causality is thought to be reversed. The ISTDP therapist would posit that unconscious emotions lead to unconscious anxiety, which is managed by unconscious defences. These defences can certainly include hopeless, helpless, or self-deprecating cognitions. Rather than examining evidence for and against a thought like, "I am unable to know my own true feelings," an ISTDP therapist might say, "If you adopt that position, which is essentially a position of helplessness, we will not get to the engine driving your difficulties. If you renounce this helpless position, how are you truly feeling right now?"
Both the CBT and ISTDP therapist call the thought into question, with the goal of ultimately liberating the patient. The difference is that the ISTDP therapist sees the faulty cognition as preventing access to the true, buried feelings, while the CBT therapist sees the faulty cognition as the cause of the painful emotions leading to the painful psychological state. It may well be the case that causality flows in both directions, dependent on the individual, the emotions, and the cognitions involved. As of this writing, though both CBT and ISTDP show good evidence of clinical efficacy, the theoretical question of whether feelings drive thoughts or thoughts drive feelings remains unresolved; it could well be the case that thought and feeling are inextricably bound, and that we have not yet developed adequate psychological or neuroscientific concepts and tools to frame these sorts of questions properly.
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