• Friedemann Geiger, Katrin Liethmann, Frauke Hoffmann, Jutta Paschedag, and Jürgen Kasper.
• Tumor Center, University Medical Center Schleswig-Holstein, Niemannsweg 4, 24105 Kiel, Germany. f.geiger@uksh.de
• Trials. 2011 Jan 1;12:232.

BackgroundShared Decision Making (SDM) is regarded as the best practice model for the communicative challenge of decision making about treatment or diagnostic options. However, randomized controlled trials focusing the effectiveness of SDM trainings are rare and existing measures of SDM are increasingly challenged by the latest research findings. This study will 1) evaluate a new physicians' communication training regarding patient involvement in terms of SDM, 2) validate SDM(MASS), a new compound measure of SDM, and 3) evaluate the effects of SDM on the perceived quality of the decision process and on the elaboration of the decision.MethodsIn a multi-center randomized controlled trial with a waiting control group, 40 physicians from 7 medical fields are enrolled. Each physician contributes a sequence of four medical consultations including a diagnostic or treatment decision.The intervention consists of two condensed video-based individual coaching sessions (15 min.) supported by a manual and a DVD. The interventions alternate with three measurement points plus follow up (6 months).Realized patient involvement is measured using the coefficient SDM(MASS) drawn from the Multifocal Approach to the Sharing in SDM (MAPPIN'SDM) which includes objective involvement, involvement as perceived by the patient, and the doctor-patient concordance regarding their judges of the involvement. For validation purposes, all three components of SDM(MASS) are supplemented by similar measures, the OPTION observer scale, the Shared Decision Making Questionnaire (SDM-Q) and the dyadic application of the Decisional Conflict Scale (DCS). Training effects are analyzed using t-tests. Spearman correlation coefficients are used to determine convergent validities, the influence of involvement (SDMMASS) on the perceived decision quality (DCS) and on the elaboration of the decision. The latter is operationalised by the ELAB coefficient from the UP24 (Uncertainty Profile, 24 items version).DiscussionDue to the rigorous blinded randomized controlled design, the current trial promises valid and reliable results. On the one hand, we expect this condensed time-saving training to be adopted in clinical routine more likely than previous trainings. On the other hand, the exhaustivity of the MAPPIN'SDM measurement system qualifies it as a reference measure for simpler instruments and to deepen understanding of decision-making processes.Trial RegistrationCurrent Controlled Trials ISRCTN78716079.© 2011 Geiger et al; licensee BioMed Central Ltd.

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