Thinking About ‘Dose’ and SLP Practice: Part II

I have been talking about whether it is helpful to think about dose-response relationships as an important aspect of treatment efficacy. During a recent @wespeechies exchange, we discussed whether this “medical” concept should be applied to speech therapy. One objection raised was the idea that treatment efficacy is “all about relationships” and therefore the dosage of specific inputs was not all that relevant to outcomes. In psychotherapy, objections to manualized care protocols that prescribe specific procedures for defined cases are also based on the notion that treatment efficacy is determined not by the specific ingredients of the treatment program but rather by common factors, as I discussed in a previous blog. One of the important common factors is the therapeutic alliance. How important is the therapeutic alliance to treatment outcomes? And does attention to the therapeutic alliance preclude thinking carefully about which procedures to use in which amounts with a given case?

In psychotherapy the therapeutic alliance is defined “as agreement on the goals and tasks of therapy in the context of a positive affective bond between patient and therapist.” Even when working with children, this can be an important aspect of the treatment program. For example, McCormack, McLeod, McAllister and Harrison describe children’s experience of speech impairment in a paper entitled “My Speech Problem, Your Listening Problem, My Frustration…”. This qualitative study illuminates multiple facets of an SSD and further shows that the child’s perspective and the adult’s perspective on the problem and the solution are often not aligned. Shifting the child’s attention to the role of his or her speech problem in communication breakdowns will require a genuine, caring, sensitive and trusting relationship between SLP and child. Establishing common goals and motivating the child to try new tasks to achieve those goals will also be highly dependent upon the therapeutic alliance between child and therapist.

To understand how the therapeutic alliance impacts on therapy outcomes we must return to the psychotherapy literature because I am aware of no scientific studies in the speech therapy arena that have addressed this issue directly. In mental health services, the strength of the therapeutic alliance is measured by asking clients questions about their relationship with their therapist in three domains, specifically goals (e.g., We agree on what is important for me to work on.), tasks (e.g., I agree the way we are working on my problem is correct), and bond (e.g., I believe my therapist likes me).  Very large sample studies have shown that the relationship between therapist and client accounts for about 20% of variance in outcomes. However, the relationship between outcomes and the therapeutic relationship is reciprocal: if the client gets better, they have more trust in the therapist’s guidance regarding goals and tasks. Therefore, the therapeutic relationship is theoretically independent of the techniques and procedures that the therapist uses, but in practice these variables may be related.

To put this in the speech therapy context again, Francoise Brosseau-Lapré and I are in the process of publishing the results of our RCT, Essai Clinique sur les Interventions Phonologique. We found that an input oriented approach (procedures focused on perceptual and phonological knowledge with very little articulatory practice) was as effective as an output oriented approach (all procedures focused on articulation practice) for improving children’s articulation accuracy.  Therefore, when working with a very shy child who does not like to imitate or indeed, talk at all, during speech therapy, you and the parent and the child might all agree that the input oriented approach is the ideal way to work on the child’s speech problem. Initially the therapeutic alliance might be high but what if the implementation of the approach is not competent? We find for example that it is actually quite difficult to teach students to implement the procedures (focused stimulation, error detection tasks and meaningful minimal pairs procedures) correctly. Furthermore we found that when procedures are mixed and matched in a way that is not theoretically coherent (for example, input oriented procedures in the clinic but an output oriented home practice program), we observed very poor outcomes. It is probable that in cases of poor implementation, outcomes and the therapeutic alliance will both suffer. At the very least, as I have found previously, parents are able to identify poor speech outcomes in their children even as they report good relationships with their child’s SLP.

This discussion reminds me of a very interesting article about teacher effectiveness that was circulated on twitter by @KevinWheldell. Gregory Yates makes the distinction between good teachers and effective teachers. Similarly SLPs may be readily judged to be good on the basis of personal and moral qualities such as warmth, caring, friendliness and conscientiousness, all of which contribute to positive relationships with clients, coworkers and their institution. Effectiveness requires the skillful application of specific techniques and procedures in relation to client needs however and can only be measured in reference to client outcomes. More about this in the next blogpost in this series.

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  1. Thinking about ‘Dose’ and SLP Practice: Part III | Developmental Phonological Disorders

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