Predictive Factors of Short/Long-term Outcome and Complications of Bilateral DBS in PD

Study Overview
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Brief Summary
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The purpose and main objective of this study is the research of pre-operative and operative predictive factors of short-term (1-year) and long-term (15-years) improvement of quality of life, motor and non-motor symptoms in Parkinson's disease patients who have undergone to bilateral Subthalamic Nucleus Deep Brain Stimulation. The hypothesis of the study is that the definition of pre-operative and operative predictive factors could be able to improve the pre-operative prognostic accuracy of outcome and complications after surgery, allowing also a better selection of the most suitable candidates for bilateral Subthalamic Nucleus Deep Brain Stimulation. For example, we can suppose that an older age at surgery, elevated axial score, a less preoperative dopa-responsiveness, the presence of mild executive dysfunction at surgery or an unfavourable social status, could negatively influence the short and long term surgery outcome

Detailed Description
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Subthalamic NucleusDeep Brain Stimulation (STN-DBS) represents a short and long-term effective treatment in Parkinson's disease (PD) patients. Various randomized controlled trials have confirmed the superiority of STN-DBS compared to the best medical treatment in patients with advanced Parkinson disease in term of improvement of motor function and quality of life. On the other hand, STN- DBS is associated with an increased risk of adverse events compared to best medical treatment. Data from previous meta-analysis have shown that only pre-operative dopa-responsiveness can predict the clinical efficacy and outcome of STN-DBS. In particular the improvement of STN-DBS on quality of life mainly concern the physical aspects of functioning with a lower improvement on social and cognitive aspects. However, not all of PD symptoms respond similarly to STN-DBS. In particular the effects of STN-DBS on the so-called levodopa unresponsive symptoms (i.e. gait and balance symptoms, autonomic dysfunction, sleep disorders, cognitive decline and speech and swallowing troubles) are modest or absent. Furthermore, levodopa unresponsive symptoms are one of the main causes of impairment and disability in advanced PD patients. Bearing in mind these informations, the clinical phenotyping of candidates for surgery appear crucial for the prediction of DBS outcome and selection of better candidates. In the recent years, several papers highlighted and expanded the list of possible predictive factors, from a motor point of view to non-motor symptoms and psychosocial aspects. In this setting, the aim of our study is to determine the pre-operative and operative short-term (1-year) and long-term (15-years) predictive factors of improvement of quality of life and motor and non-motor symptoms in a large cohort of PD patients who have undergone to bilateral STN-DBS. The better definition of short-term and long-term predictive factors and its association with the different PD different clinical phenotypes could allow in the future a better definition of the effects of STN-DBS on quality of life and motor and non-motor symptoms in the different PD clinical phenotypes. In the same way, it could be assumed that a better definition of pre-operative predictive factors of surgical, hardware and stimulation-induced STN-DBS side effects in the short term, could also allow a better definition of the risk-to-benefit ratio and outcome after STN-DBS surgery

Official Title
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Étude Des Facteurs prédictifs Des Effets Cliniques et Des Complications à Court et Long Terme de la Stimulation cérébrale Profonde Des Noyaux Sous-thalamiques Dans la Maladie de Parkinson

Conditions
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Parkinson Disease

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with Parkinson's disease treated with bilateral Subthalamic Nucleus Deep Brain Stimulation Exclusion Criteria: Patients treated with bilateral Subthalamic Nucleus Deep Brain Stimulation not affected by Parkinson's Disease Patients with Parkinson's disease treated with unilateral Subthalamic Nucleus Deep Brain Stimulation

Ages Eligible for Study
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Minimum Age: 30 Years
Maximum Age: 80 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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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in the Unified Parkinson's Disease Rating Scale (UPDRS) section I, II, III, IV, V, VI scores | The Unified Parkinson's Disease Rating Scale (UPDRS) has been developed for the clinical evaluation of Parkinson's disease (PD) patients. It allows the assessment of both motor and non-motor symptoms associated with PD | pre-operative evaluation, 1-year and 15-years after Subthalamic Nucleus Deep Brain Stimulation | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Patients that developed Treatment-Related (drug-related or DBS-related) complications | Surgical-related complications, post-operative complications related to DBS devices and hardware, complications related to STN stimulation or drug administration. Post-operative complications directly related to STN stimulation. | 1 year after bilateral Subthalamic Nucleus Deep Brain Stimulation | 
| Changes in the Parkinson's Disease Questionnaire (PDQ-39) total score and different subscale scores (Mobility; Activities of daily living; Emotional well being; Stigma; Social Support; Cognitions; Communication; Bodily discomfort) | The Parkinson's Disease Questionnaire (PDQ-39) is a short 39 item self-report health status questionnaire developed for evaluate the quality of life in Parkinson's disease patients. | pre-operative evaluation, 1-year and 15-years after Subthalamic Nucleus Deep Brain Stimulation | 
| Changes in the Movement Disorder Society (MDS)-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) part I, II, III, IV scores | The Movement Disorder Society (MDS)-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) is the recent version of the UPDRS revised by the MDS. It allows the assessment of both motor and non-motor symptoms associated with PD | pre-operative evaluation, 1-year after Subthalamic Nucleus Deep Brain Stimulation | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Parkinson Disease, Deep Brain Stimulation, Subthalamic Nucleus, Predictive factors