Development and Validation of a Scale Measuring Preoperative Expectations in Parkinson's Disease

Study Overview
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Brief Summary
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Subthalamic nucleus deep brain stimulation (STN-DBS) has become a choice treatment for fluctuating Parkinson's disease (PD) patients, inducing remarkable improvement in motor symptoms. However, as PD is a complex neuropsychiatric disease, it has been hypothesized that in some patients, non-motor features, i.e. dysfunctional expectations for the result of neurosurgery, could interfere with postoperative result of DBS, even in case of motor improvement. Recent literature highlights the necessity to take these preoperative expectations into account, but to our knowledge, no specific scale investigating these cognitions in this PD-specific condition is available. So, the investigators developped the DBS-PS, a self-scale constructed to measure preoperative expectations for DBS, with 11 questions and visuo-analogical responses (1 to 10), theorically divided in three domains investigating the expectations concerning symptoms of PD, postoperative social-life and leisures, and postoperative familial and marital sphere. The investigators would like to validate this new-developped scale in the preoperative subthalamic nucleus deep brain stimulation population through patients recruited in the Predistim study, whereas the investigators did not recruite sufficiently patients through the PsyParkinson study, the one in which the DBS-PS scale was developed. The DBS-PS constitutes an interesting basis for the consideration of these cognitive and affective factors in preoperative PD patients.

Official Title
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Development and Validation of a French Scale Measuring Preoperative Expectations of Parkinson's Disease Patients Candidate to Deep Brain Stimulation : the DBS-PS (Deep Brain Stimulation Perception Scale)

Conditions
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Parkinson's Disease

Intervention / Treatment
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* Behavioral: pre DBS patients responding to the DBS-PS scale


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Parkinson's disease patients included in the Predistim study and having completed the DBS-PS scale during the preoperative phase Exclusion Criteria: Parkinson's disease patients not included in the Predistim study or not having completed the DBS-PS scale during the preoperative phase

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| preoperative Parkinson' disease<br>pre DBS parkinson's disease patients responding to the DBS-PS scale preoperatively | Behavioral: pre DBS patients responding to the DBS-PS scale<br>* we propose to parkinson's disease patients selected for subthalamic deep brain stimulation to complete the DBS-PS scale preoperatively<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Validation of the Deep-brain stimulation - perception scale (DBS-PS scale) | Deep Brain Stimulation-Perception Scale completed by Parkinson's disease patients enrolled in the Predistim study; minimum scale score 0 - maximum scale score 50, for each sub-scores (3 dimensions) ; a higher score corresponding to higher expectations in the dimension, and a lower score coresponding to lower expectations in the dimension | during the inclusion/baseline period of Predistim study | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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deep brain stimulation, preoperative expectations, DBS-PS, validation, Parkinson's disease