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Ong K, Schmidt F, Tosefsky K, Faran M, Sarica C, Honey CR, Vila-Rodriguez F, Lang S. Non-Motor Effects of Low-Frequency Deep Brain Stimulation of the Subthalamic Nucleus in Parkinson's Disease: A Systematic Review. Stereotact Funct Neurosurg 2024:1-13. [PMID: 39089232 DOI: 10.1159/000540210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Accepted: 06/28/2024] [Indexed: 08/03/2024]
Abstract
INTRODUCTION Deep brain stimulation of the subthalamic nucleus is an effective therapy for the motor symptoms of Parkinson's disease (PD). Typically, stimulation is applied at a high frequency (≥100 Hz) to alleviate motor symptoms. However, the effects on non-motor symptoms can be variable. Low-frequency oscillations are increasingly recognized as playing an important role in the non-motor functions of the subthalamic nucleus. Therefore, it has been hypothesized that low-frequency stimulation of the subthalamic nucleus (<100 Hz) may have a direct effect on these non-motor functions, thereby preferentially impacting non-motor symptoms of PD. Despite important therapeutic implications, the literature on this topic has not been summarized. METHOD To understand the current state of the field, we performed a comprehensive systematic review of the literature assessing the non-motor effects of low-frequency stimulation of the subthalamic nucleus in PD. We performed a supplementary meta-analysis to assess the effects of low- versus high-frequency stimulation on verbal fluency outcomes. RESULTS Our search returned 7,009 results, of which we screened 4,199 results. A total of 145 studies were further assessed for eligibility, and a total of 21 studies met our inclusion criteria, representing 297 patients. These studies were a mix of case reports and control trials. The four clinical outcomes measured were sleep, sensory perception, cognition, and mood. A supplementary meta-analysis of six studies investigating the impact of low-frequency stimulation on verbal fluency did not find any significant results when pooling across subgroups. CONCLUSION LFS of the STN may have benefits on a range of cognitive and affective symptoms in PD. However, current studies in this space are heterogeneous, and the effect sizes are small. Factors that impact outcomes can be divided into stimulation and patient factors. Future work should consider the interactions between stimulation location and stimulation frequency as well as how these interact depending on the specific non-motor phenotype.
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Affiliation(s)
- Kenneth Ong
- Faculty of Medicine, University of British Columbia, Health Sciences Mall, Vancouver, British Columbia, Canada,
| | - Franziska Schmidt
- Division of Neurosurgery, Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada
- Department of Neurosurgery, Medical University Innsbruck, Innsbruck, Austria
| | - Kira Tosefsky
- Faculty of Medicine, University of British Columbia, Health Sciences Mall, Vancouver, British Columbia, Canada
| | - Muhammad Faran
- Faculty of Medicine, University of British Columbia, Health Sciences Mall, Vancouver, British Columbia, Canada
| | - Can Sarica
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Christopher R Honey
- Division of Neurosurgery, Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada
| | - Fidel Vila-Rodriguez
- Division of Neuroscience and Translational Psychiatry, Department of Psychiatry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Stefan Lang
- Division of Neurosurgery, Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada
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Guzzi G, Della Torre A, Bruni A, Lavano A, Bosco V, Garofalo E, La Torre D, Longhini F. Anatomo-physiological basis and applied techniques of electrical neuromodulation in chronic pain. JOURNAL OF ANESTHESIA, ANALGESIA AND CRITICAL CARE 2024; 4:29. [PMID: 38698460 PMCID: PMC11064427 DOI: 10.1186/s44158-024-00167-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 04/24/2024] [Indexed: 05/05/2024]
Abstract
Chronic pain, a complex and debilitating condition, poses a significant challenge to both patients and healthcare providers worldwide. Conventional pharmacological interventions often prove inadequate in delivering satisfactory relief while carrying the risks of addiction and adverse reactions. In recent years, electric neuromodulation emerged as a promising alternative in chronic pain management. This method entails the precise administration of electrical stimulation to specific nerves or regions within the central nervous system to regulate pain signals. Through mechanisms that include the alteration of neural activity and the release of endogenous pain-relieving substances, electric neuromodulation can effectively alleviate pain and improve patients' quality of life. Several modalities of electric neuromodulation, with a different grade of invasiveness, provide tailored strategies to tackle various forms and origins of chronic pain. Through an exploration of the anatomical and physiological pathways of chronic pain, encompassing neurotransmitter involvement, this narrative review offers insights into electrical therapies' mechanisms of action, clinical utility, and future perspectives in chronic pain management.
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Affiliation(s)
- Giusy Guzzi
- Neurosurgery Department, "R. Dulbecco" Hospital, Department of Medical and Surgical Sciences, "Magna Graecia" University of Catanzaro, Catanzaro, Italy
| | - Attilio Della Torre
- Neurosurgery Department, "R. Dulbecco" Hospital, Department of Medical and Surgical Sciences, "Magna Graecia" University of Catanzaro, Catanzaro, Italy
| | - Andrea Bruni
- Anesthesia and Intensive Care Unit, "R. Dulbecco" Univesity Hospital, Department of Medical and Surgical Sciences, Magna Graecia University, Viale Europa, Catanzaro, 88100, Italy
| | - Angelo Lavano
- Neurosurgery Department, "R. Dulbecco" Hospital, Department of Medical and Surgical Sciences, "Magna Graecia" University of Catanzaro, Catanzaro, Italy
| | - Vincenzo Bosco
- Anesthesia and Intensive Care Unit, "R. Dulbecco" Univesity Hospital, Department of Medical and Surgical Sciences, Magna Graecia University, Viale Europa, Catanzaro, 88100, Italy
| | - Eugenio Garofalo
- Anesthesia and Intensive Care Unit, "R. Dulbecco" Univesity Hospital, Department of Medical and Surgical Sciences, Magna Graecia University, Viale Europa, Catanzaro, 88100, Italy
| | - Domenico La Torre
- Neurosurgery Department, "R. Dulbecco" Hospital, Department of Medical and Surgical Sciences, "Magna Graecia" University of Catanzaro, Catanzaro, Italy
| | - Federico Longhini
- Anesthesia and Intensive Care Unit, "R. Dulbecco" Univesity Hospital, Department of Medical and Surgical Sciences, Magna Graecia University, Viale Europa, Catanzaro, 88100, Italy.
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Heß T, Themann P, Oehlwein C, Milani TL. Does Impaired Plantar Cutaneous Vibration Perception Contribute to Axial Motor Symptoms in Parkinson's Disease? Effects of Medication and Subthalamic Nucleus Deep Brain Stimulation. Brain Sci 2023; 13:1681. [PMID: 38137129 PMCID: PMC10742284 DOI: 10.3390/brainsci13121681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/28/2023] [Accepted: 12/03/2023] [Indexed: 12/24/2023] Open
Abstract
OBJECTIVE To investigate whether impaired plantar cutaneous vibration perception contributes to axial motor symptoms in Parkinson's disease (PD) and whether anti-parkinsonian medication and subthalamic nucleus deep brain stimulation (STN-DBS) show different effects. METHODS Three groups were evaluated: PD patients in the medication "on" state (PD-MED), PD patients in the medication "on" state and additionally "on" STN-DBS (PD-MED-DBS), as well as healthy subjects (HS) as reference. Motor performance was analyzed using a pressure distribution platform. Plantar cutaneous vibration perception thresholds (VPT) were investigated using a customized vibration exciter at 30 Hz. RESULTS Motor performance of PD-MED and PD-MED-DBS was characterized by greater postural sway, smaller limits of stability ranges, and slower gait due to shorter strides, fewer steps per minute, and broader stride widths compared to HS. Comparing patient groups, PD-MED-DBS showed better overall motor performance than PD-MED, particularly for the functional limits of stability and gait. VPTs were significantly higher for PD-MED compared to those of HS, which suggests impaired plantar cutaneous vibration perception in PD. However, PD-MED-DBS showed less impaired cutaneous vibration perception than PD-MED. CONCLUSIONS PD patients suffer from poor motor performance compared to healthy subjects. Anti-parkinsonian medication in tandem with STN-DBS seems to be superior for normalizing axial motor symptoms compared to medication alone. Plantar cutaneous vibration perception is impaired in PD patients, whereas anti-parkinsonian medication together with STN-DBS is superior for normalizing tactile cutaneous perception compared to medication alone. Consequently, based on our results and the findings of the literature, impaired plantar cutaneous vibration perception might contribute to axial motor symptoms in PD.
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Affiliation(s)
- Tobias Heß
- Department of Human Locomotion, Chemnitz University of Technology, 09126 Chemnitz, Germany
| | - Peter Themann
- Department of Neurology and Parkinson, Clinic at Tharandter Forest, 09633 Halsbruecke, Germany
| | - Christian Oehlwein
- Neurological Outpatient Clinic for Parkinson Disease and Deep Brain Stimulation, 07551 Gera, Germany
| | - Thomas L. Milani
- Department of Human Locomotion, Chemnitz University of Technology, 09126 Chemnitz, Germany
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4
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Venkatesh P, Wolfe C, Lega B. Neuromodulation of the anterior thalamus: Current approaches and opportunities for the future. CURRENT RESEARCH IN NEUROBIOLOGY 2023; 5:100109. [PMID: 38020810 PMCID: PMC10663132 DOI: 10.1016/j.crneur.2023.100109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 08/28/2023] [Accepted: 08/31/2023] [Indexed: 12/01/2023] Open
Abstract
The role of thalamocortical circuits in memory has driven a recent burst of scholarship, especially in animal models. Investigating this circuitry in humans is more challenging. And yet, the development of new recording and stimulation technologies deployed for clinical indications has created novel opportunities for data collection to elucidate the cognitive roles of thalamic structures. These technologies include stereoelectroencephalography (SEEG), deep brain stimulation (DBS), and responsive neurostimulation (RNS), all of which have been applied to memory-related thalamic regions, specifically for seizure localization and treatment. This review seeks to summarize the existing applications of neuromodulation of the anterior thalamic nuclei (ANT) and highlight several devices and their capabilities that can allow cognitive researchers to design experiments to assay its functionality. Our goal is to introduce to investigators, who may not be familiar with these clinical devices, the capabilities, and limitations of these tools for understanding the neurophysiology of the ANT as it pertains to memory and other behaviors. We also briefly cover the targeting of other thalamic regions including the centromedian (CM) nucleus, dorsomedial (DM) nucleus, and pulvinar, with associated potential avenues of experimentation.
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Affiliation(s)
- Pooja Venkatesh
- Department of Neurosurgery, University of Texas Southwestern, Dallas, TX, 75390, USA
| | - Cody Wolfe
- Department of Neurosurgery, University of Texas Southwestern, Dallas, TX, 75390, USA
| | - Bradley Lega
- Department of Neurosurgery, University of Texas Southwestern, Dallas, TX, 75390, USA
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Szymoniuk M, Chin JH, Domagalski Ł, Biszewski M, Jóźwik K, Kamieniak P. Brain stimulation for chronic pain management: a narrative review of analgesic mechanisms and clinical evidence. Neurosurg Rev 2023; 46:127. [PMID: 37247036 PMCID: PMC10227133 DOI: 10.1007/s10143-023-02032-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/01/2023] [Accepted: 05/10/2023] [Indexed: 05/30/2023]
Abstract
Chronic pain constitutes one of the most common chronic complaints that people experience. According to the International Association for the Study of Pain, chronic pain is defined as pain that persists or recurs longer than 3 months. Chronic pain has a significant impact on individuals' well-being and psychosocial health and the economy of healthcare systems as well. Despite the availability of numerous therapeutic modalities, treatment of chronic pain can be challenging. Only about 30% of individuals with non-cancer chronic pain achieve improvement from standard pharmacological treatment. Therefore, numerous therapeutic approaches were proposed as a potential treatment for chronic pain including non-opioid pharmacological agents, nerve blocks, acupuncture, cannabidiol, stem cells, exosomes, and neurostimulation techniques. Although some neurostimulation methods such as spinal cord stimulation were successfully introduced into clinical practice as a therapy for chronic pain, the current evidence for brain stimulation efficacy in the treatment of chronic pain remains unclear. Hence, this narrative literature review aimed to give an up-to-date overview of brain stimulation methods, including deep brain stimulation, motor cortex stimulation, transcranial direct current stimulation, repetitive transcranial magnetic stimulation, cranial electrotherapy stimulation, and reduced impedance non-invasive cortical electrostimulation as a potential treatment for chronic pain.
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Affiliation(s)
- Michał Szymoniuk
- Student Scientific Association at the Department of Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Jia-Hsuan Chin
- Student Scientific Association at the Department of Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Łukasz Domagalski
- Student Scientific Association at the Department of Neurosurgery, Medical University of Lublin, Lublin, Poland.
| | - Mateusz Biszewski
- Student Scientific Association at the Department of Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Katarzyna Jóźwik
- Student Scientific Association at the Department of Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Piotr Kamieniak
- Department of Neurosurgery, Medical University of Lublin, Lublin, Poland
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6
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Flouty O, Yamamoto K, Germann J, Harmsen IE, Jung HH, Cheyuo C, Zemmar A, Milano V, Sarica C, Lozano AM. Idiopathic Parkinson's disease and chronic pain in the era of deep brain stimulation: a systematic review and meta-analysis. J Neurosurg 2022; 137:1821-1830. [PMID: 35535836 DOI: 10.3171/2022.2.jns212561] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 02/21/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Pain is the most common nonmotor symptom of Parkinson's disease (PD) and is often undertreated. Deep brain stimulation (DBS) effectively mitigates the motor symptoms of this multisystem neurodegenerative disease; however, its therapeutic effect on nonmotor symptoms, especially pain, remains inconclusive. While there is a critical need to help this large PD patient population, guidelines for managing this significant disease burden are absent. Herein, the authors systematically reviewed the literature and conducted a meta-analysis to study the influence of traditional (subthalamic nucleus [STN] and globus pallidus internus [GPi]) DBS on chronic pain in patients with PD. METHODS The authors performed a systematic review of the literature and a meta-analysis following PRISMA guidelines. Risk of bias was assessed using the levels of evidence established by the Oxford Centre for Evidence-Based Medicine. Inclusion criteria were articles written in English, published in a peer-reviewed scholarly journal, and about studies conducting an intervention for PD-related pain in no fewer than 5 subjects. RESULTS Twenty-six studies were identified and included in this meta-analysis. Significant interstudy heterogeneity was detected (Cochran's Q test p < 0.05), supporting the use of the random-effects model. The random-effects model estimated the effect size of DBS for the treatment of idiopathic pain as 1.31 (95% CI 0.84-1.79). The DBS-on intervention improved pain scores by 40% as compared to the control state (preoperative baseline or DBS off). CONCLUSIONS The results indicated that traditional STN and GPi DBS can have a favorable impact on pain control and improve pain scores by 40% from baseline in PD patients experiencing chronic pain. Further trials are needed to identify the subtype of PD patients whose pain benefits from DBS and to identify the mechanisms by which DBS improves pain in PD patients.
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Affiliation(s)
- Oliver Flouty
- 1Department of Neurosurgery, University of South Florida, Tampa, Florida
| | - Kazuaki Yamamoto
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Jurgen Germann
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Irene E Harmsen
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Hyun Ho Jung
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada.,3Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Cletus Cheyuo
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Ajmal Zemmar
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada.,4Department of Neurosurgery, University of Louisville, School of Medicine, Louisville, Kentucky; and.,5Department of Neurosurgery, Henan Provincial People's Hospital, Henan University People's Hospital, Henan University School of Medicine, Zhengzhou, China
| | - Vanessa Milano
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Can Sarica
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Andres M Lozano
- 2Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
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7
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Kaiserova M, Kastelikova A, Grambalova Z, Otruba P, Zapletalova J, Mensikova K, Rosales R, Kanovsky P. Temperature sensation in Parkinson's disease measured by quantitative sensory testing: a single-center, case-control study. Int J Neurosci 2021:1-6. [PMID: 34666599 DOI: 10.1080/00207454.2021.1991922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND The pathophysiology of abnormal temperature sensation in Parkinson's disease (PD) remains unclear. Abnormal thermal detection does not seem to depend on the dopaminergic deficit, suggesting that other systems play a role in these changes, probably both central and peripheral. METHODS We measured thermal detection thresholds (TDT) using quantitative sensory testing (QST) in 28 patients with PD and compared them with 15 healthy controls. RESULTS Of 28 patients, 21% had increased TDT according to the normative data. TDT were higher on the dominant side. No correlation between TDT and disease duration, severity of motor impairment, and dopaminergic therapy was observed. 50% of the patients had difficulty differentiating between warm and cold stimuli, as TDT were within the normal range in most of these patients. CONCLUSIONS Twenty-one percent of the patients in our study had increased TDT according to the normative data. Abnormal thermal detection was more pronounced on the dominant side. Abnormal differentiation between the thermal stimuli suggest impaired central processing of thermal information.
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Affiliation(s)
- Michaela Kaiserova
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Anetta Kastelikova
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Zuzana Grambalova
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Pavel Otruba
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Jana Zapletalova
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Katerina Mensikova
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Raymond Rosales
- The Neuroscience Institute, Department of Neurology and Psychiatry, University of Santo Tomas University Hospital, Manila, Philippines
| | - Petr Kanovsky
- Department of Neurology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
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8
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Khazen O, DiMarzio M, Platanitis K, Grimaudo HC, Hancu M, Shao MM, Staudt MD, Maguire L, Sukul VV, Durphy J, Hanspal EK, Adam O, Molho E, Pilitsis JG. Sex-specific effects of subthalamic nucleus stimulation on pain in Parkinson's disease. J Neurosurg 2021; 135:629-636. [PMID: 33036000 DOI: 10.3171/2020.6.jns201126] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/08/2020] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is known to reduce motor symptoms of Parkinson's disease (PD). The effects of DBS on various nonmotor symptoms often differ from patient to patient. The factors that determine whether or not a patient will respond to treatment have not been elucidated. Here, the authors evaluated sex differences in pain relief after DBS for PD. METHODS The authors prospectively evaluated 20 patients preoperatively and postoperatively after bilateral STN DBS with the validated numeric rating scale (NRS), Revised Oswestry Disability Index for low-back pain (RODI), and King's Parkinson's Disease Pain Scale (KPDPS) and assessed the impact of sex as a biological variable. RESULTS The cohort consisted of 6 female and 14 male patients with a mean duration of 11.8 ± 2.0 months since DBS surgery. Females were significantly older (p = 0.02). Covariate analysis, however, showed no effect of age, stimulation settings, or other confounding variables. KPDPS total scores statistically significantly improved only among males (p < 0.001). Males improved more than females in musculoskeletal and chronic subsets of the KPDPS (p = 0.03 and p = 0.01, respectively). RODI scores significantly improved in males but not in females (p = 0.03 and p = 0.30, respectively). Regarding the NRS score, the improvements seen in both sexes in NRS were not significant. CONCLUSIONS Although it is well recognized that pain complaints in PD are different between men and women, this study is unique in that it examines the sex-specific DBS effects on this symptom. Considering sex as a biological variable may have important implications for DBS pain outcome studies moving forward.
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Affiliation(s)
- Olga Khazen
- Departments of1Neuroscience and Experimental Therapeutics
| | | | | | | | - Maria Hancu
- Departments of1Neuroscience and Experimental Therapeutics
| | - Miriam M Shao
- Departments of1Neuroscience and Experimental Therapeutics
| | | | - Lucy Maguire
- Departments of1Neuroscience and Experimental Therapeutics
- 2Neurosurgery, and
| | | | | | - Era K Hanspal
- 3Neurology, Albany Medical College, Albany, New York
| | - Octavian Adam
- 3Neurology, Albany Medical College, Albany, New York
| | - Eric Molho
- 3Neurology, Albany Medical College, Albany, New York
| | - Julie G Pilitsis
- Departments of1Neuroscience and Experimental Therapeutics
- 2Neurosurgery, and
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9
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Mostofi A, Morgante F, Edwards MJ, Brown P, Pereira EAC. Pain in Parkinson's disease and the role of the subthalamic nucleus. Brain 2021; 144:1342-1350. [PMID: 34037696 DOI: 10.1093/brain/awab001] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/07/2020] [Accepted: 10/22/2020] [Indexed: 11/14/2022] Open
Abstract
Pain is a frequent and poorly treated symptom of Parkinson's disease, mainly due to scarce knowledge of its basic mechanisms. In Parkinson's disease, deep brain stimulation of the subthalamic nucleus is a successful treatment of motor symptoms, but also might be effective in treating pain. However, it has been unclear which type of pain may benefit and how neurostimulation of the subthalamic nucleus might interfere with pain processing in Parkinson's disease. We hypothesized that the subthalamic nucleus may be an effective access point for modulation of neural systems subserving pain perception and processing in Parkinson's disease. To explore this, we discuss data from human neurophysiological and psychophysical investigations. We review studies demonstrating the clinical efficacy of deep brain stimulation of the subthalamic nucleus for pain relief in Parkinson's disease. Finally, we present some of the key insights from investigations in animal models, healthy humans and Parkinson's disease patients into the aberrant neurobiology of pain processing and consider their implications for the pain-relieving effects of subthalamic nucleus neuromodulation. The evidence from clinical and experimental studies supports the hypothesis that altered central processing is critical for pain generation in Parkinson's disease and that the subthalamic nucleus is a key structure in pain perception and modulation. Future preclinical and clinical research should consider the subthalamic nucleus as an entry point to modulate different types of pain, not only in Parkinson's disease but also in other neurological conditions associated with abnormal pain processing.
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Affiliation(s)
- Abteen Mostofi
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute, St George's, University of London, SW17 0RE, London, UK
| | - Francesca Morgante
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute, St George's, University of London, SW17 0RE, London, UK
- Department of Experimental and Clinical Medicine, University of Messina, 98125, Messina, Italy
| | - Mark J Edwards
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute, St George's, University of London, SW17 0RE, London, UK
| | - Peter Brown
- Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, OX1 3TH, Oxford, UK
| | - Erlick A C Pereira
- Neurosciences Research Centre, Molecular and Clinical Sciences Research Institute, St George's, University of London, SW17 0RE, London, UK
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10
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Lu CW, Harper DE, Askari A, Willsey MS, Vu PP, Schrepf AD, Harte SE, Patil PG. Stimulation of zona incerta selectively modulates pain in humans. Sci Rep 2021; 11:8924. [PMID: 33903611 PMCID: PMC8076305 DOI: 10.1038/s41598-021-87873-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 04/06/2021] [Indexed: 12/02/2022] Open
Abstract
Stimulation of zona incerta in rodent models has been shown to modulate behavioral reactions to noxious stimuli. Sensory changes observed in Parkinsonian patients with subthalamic deep brain stimulation suggest that this effect is translatable to humans. Here, we utilized the serendipitous placement of subthalamic deep brain stimulation leads in 6 + 5 Parkinsonian patients to directly investigate the effects of zona incerta stimulation on human pain perception. We found that stimulation at 20 Hz, the physiological firing frequency of zona incerta, reduces experimental heat pain by a modest but significant amount, achieving a 30% reduction in one fifth of implants. Stimulation at higher frequencies did not modulate heat pain. Modulation was selective for heat pain and was not observed for warmth perception or pressure pain. These findings provide a mechanistic explanation of sensory changes seen in subthalamic deep brain stimulation patients and identify zona incerta as a potential target for neuromodulation of pain.
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Affiliation(s)
- Charles W Lu
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Drive, SPC 5338, Ann Arbor, MI, 48109-5338, USA.,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Daniel E Harper
- Department of Anesthesiology, Emory University, Atlanta, GA, USA
| | - Asra Askari
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Drive, SPC 5338, Ann Arbor, MI, 48109-5338, USA
| | - Matthew S Willsey
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Drive, SPC 5338, Ann Arbor, MI, 48109-5338, USA.,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Philip P Vu
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Drive, SPC 5338, Ann Arbor, MI, 48109-5338, USA.,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Andrew D Schrepf
- Department of Anesthesiology, Chronic Pain and Fatigue Research Center, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Steven E Harte
- Department of Anesthesiology, Chronic Pain and Fatigue Research Center, University of Michigan Medical School, Ann Arbor, MI, USA.,Division of Rheumatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Parag G Patil
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Drive, SPC 5338, Ann Arbor, MI, 48109-5338, USA. .,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.
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11
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Buhmann C, Kassubek J, Jost WH. Management of Pain in Parkinson's Disease. JOURNAL OF PARKINSONS DISEASE 2020; 10:S37-S48. [PMID: 32568113 PMCID: PMC7592654 DOI: 10.3233/jpd-202069] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Pain is a very frequent symptom with influence on the quality of life in Parkinson’s disease (PD), but is still underdiagnosed and commonly treated only unsystematically. Pain etiology and pain character are often complex and multi-causal, and data regarding treatment recommendations are limited. Pain can be primarily related to PD but frequently it is associated with secondary diseases, such as arthrosis of the spine or joints. However, even basically PD-unrelated pain often is amplified by motor- or non-motor PD symptoms, such as akinesia or depression. Beyond an optimization of anti-parkinsonian treatment, additional pain treatment strategies are usually needed to properly address pain in PD. A careful pain history and diagnostic work-up is essential to rate the underlying pain pathophysiology and to develop a targeted therapeutic concept. This review gives an overview on how pain is treated in PD patients and how patients assess the effectiveness of these therapies; here, the manuscript focuses on pathophysiology-driven suggestions for a multimodal pain management in clinical practice.
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Affiliation(s)
- Carsten Buhmann
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jan Kassubek
- Department of Neurology, University of Ulm, Ulm, Germany
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Sabourin S, Khazen O, DiMarzio M, Staudt MD, Williams L, Gillogly M, Durphy J, Hanspal EK, Adam OR, Pilitsis JG. Effect of Directional Deep Brain Stimulation on Sensory Thresholds in Parkinson's Disease. Front Hum Neurosci 2020; 14:217. [PMID: 32581755 PMCID: PMC7296062 DOI: 10.3389/fnhum.2020.00217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 05/14/2020] [Indexed: 11/17/2022] Open
Abstract
Objective Previous studies showed that deep brain stimulation (DBS) relieves pain symptoms in Parkinson disease (PD) patients when programmed for motor-symptom relief. One factor involved in pain processing is sensory perception of stimuli. With the advent of directional leads, we explore whether directional DBS affects quantitative sensory testing (QST) metrics acutely. Methods PD patients with subthalamic (STN) DBS and directional leads were tested in 5 settings (DBS-OFF, DBS-ON with omnidirectional stimulation, and DBS-ON) for each of three directional segments of contact used for clinical programming. The Unified Parkinson’s Disease Rating Scale (UPDRS-III) assessed patient’s motor skills at time of study visit at clinical contact and at contact which produced optimal sensory threshold (defined by the greatest tolerance to mechanical stimuli). Correlation analyses were performed between stimulation parameters [amplitude, frequency, pulse width (PW), total electrical energy delivered (TEED)] and outcome metrics. Results Sensory thresholds were obtained in nine patients. Directional stimulation did not significantly alter patient perceptions of sensory stimulus [cold pain (p = 0.69), warm pain (p = 0.99), Von frey fibers (p = 0.09), pin-prick (p = 0.88), vibration (p = 0.40), pressure (p = 0.98)]. With correlation analysis, increasing PW at the posterior contact increased pin prick and vibration sensitivity (p < 0.001). Additionally, an increase in TEED caused a decrease in sensitivity to warm detection when using the anterior (p = 0.04), lateral (p = 0.02), and medial contacts (p = 0.03), and also caused a decrease in sensitivity to cold detection when using the medial contact (p = 0.03). UPDRS-III remained stable during testing. Conclusion Motor benefit can be acutely maintained at directional contacts, whereas directional stimulation can modulate thermal and mechanical sensitivity. Further investigation will determine whether these changes are maintained chronically or can be improved with optimized programming.
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Affiliation(s)
- Shelby Sabourin
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Olga Khazen
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Marisa DiMarzio
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Michael D Staudt
- Department of Neurosurgery, Albany Medical College, Albany, NY, United States
| | - Lucian Williams
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Michael Gillogly
- Department of Neurosurgery, Albany Medical College, Albany, NY, United States
| | - Jennifer Durphy
- Department of Neurology, Albany Medical College, Albany, NY, United States
| | - Era K Hanspal
- Department of Neurology, Albany Medical College, Albany, NY, United States
| | - Octavian R Adam
- Department of Neurology, Albany Medical College, Albany, NY, United States
| | - Julie G Pilitsis
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States.,Department of Neurosurgery, Albany Medical College, Albany, NY, United States
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Mohammed A, Bayford R, Demosthenous A. A Framework for Adapting Deep Brain Stimulation Using Parkinsonian State Estimates. Front Neurosci 2020; 14:499. [PMID: 32508580 PMCID: PMC7248244 DOI: 10.3389/fnins.2020.00499] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 04/21/2020] [Indexed: 11/26/2022] Open
Abstract
The mechanisms underlying the beneficial effects of deep brain stimulation (DBS) for Parkinson's disease (PD) remain poorly understood and are still under debate. This has hindered the development of adaptive DBS (aDBS). For further progress in aDBS, more insight into the dynamics of PD is needed, which can be obtained using machine learning models. This study presents an approach that uses generative and discriminative machine learning models to more accurately estimate the symptom severity of patients and adjust therapy accordingly. A support vector machine is used as the representative algorithm for discriminative machine learning models, and the Gaussian mixture model is used for the generative models. Therapy is effected using the state estimates obtained from the machine learning models together with a fuzzy controller in a critic-actor control approach. Both machine learning model configurations achieve PD suppression to desired state in 7 out of 9 cases; most of which settle in under 2 s.
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Affiliation(s)
- Ameer Mohammed
- Department of Electronic and Electrical Engineering, University College London, London, United Kingdom.,Department of Mechatronic Engineering, Air Force Institute of Technology, Kaduna, Nigeria
| | - Richard Bayford
- Department of Electronic and Electrical Engineering, University College London, London, United Kingdom.,Department of Natural Sciences, Middlesex University, London, United Kingdom
| | - Andreas Demosthenous
- Department of Electronic and Electrical Engineering, University College London, London, United Kingdom
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Parker T, Huang Y, Gong C, Chen Y, Wang S, Green A, Aziz T, Li L. Pain-Induced Beta Activity in the Subthalamic Nucleus of Parkinson’s Disease. Stereotact Funct Neurosurg 2020; 98:193-199. [DOI: 10.1159/000507032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 02/27/2020] [Indexed: 11/19/2022]
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Hellman A, Maietta T, Byraju K, Linda Park Y, Shao M, Liss A, Neubauer P, Burdette C, Ghoshal G, Qian J, Nalwalk J, Pilitsis JG. Low Intensity Focused Ultrasound Modulation of Vincristine Induced Neuropathy. Neuroscience 2020; 430:82-93. [DOI: 10.1016/j.neuroscience.2020.01.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 01/01/2023]
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Potential of animal models for advancing the understanding and treatment of pain in Parkinson's disease. NPJ PARKINSONS DISEASE 2020; 6:1. [PMID: 31934609 PMCID: PMC6944694 DOI: 10.1038/s41531-019-0104-6] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/02/2019] [Indexed: 12/21/2022]
Abstract
Pain is a commonly occurring non-motor symptom of Parkinson’s disease (PD). Treatment of pain in PD remains less than optimal and a better understanding of the underlying mechanisms would facilitate discovery of improved analgesics. Animal models of PD have already proven helpful for furthering the understanding and treatment of motor symptoms of PD, but could these models offer insight into pain in PD? This review addresses the current position regarding pain in preclinical models of PD, covering the face and predictive validity of existing models and their use so far in advancing understanding of the mechanisms contributing to pain in PD. While pain itself is not usually measured in animals, nociception in the form of thermal, mechanical or chemical nociceptive thresholds offers a useful readout, given reduced nociceptive thresholds are commonly seen in PD patients. Animal models of PD including the reserpine-treated rat and neurodegenerative models such as the MPTP-treated mouse and 6-hydroxydopamine (6-OHDA)-treated rat each exhibit reduced nociceptive thresholds, supporting face validity of these models. Furthermore, some interventions known clinically to relieve pain in PD, such as dopaminergic therapies and deep brain stimulation of the subthalamic nucleus, restore nociceptive thresholds in one or more models, supporting their predictive validity. Mechanistic insight gained already includes involvement of central and spinal dopamine and opioid systems. Moving forward, these preclinical models should advance understanding of the cellular and molecular mechanisms underlying pain in PD and provide test beds for examining the efficacy of novel analgesics to better treat this debilitating non-motor symptom.
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Kaszuba BC, Maietta T, Walling I, Feustel P, Stapleton A, Shin DS, Slyer J, Pilitsis JG. Effects of subthalamic deep brain stimulation with gabapentin and morphine on mechanical and thermal thresholds in 6-hydroxydopamine lesioned rats. Brain Res 2019; 1715:66-72. [PMID: 30898672 DOI: 10.1016/j.brainres.2019.03.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/15/2019] [Accepted: 03/16/2019] [Indexed: 12/14/2022]
Abstract
Chronic pain is the most common non-motor symptom among Parkinson's disease (PD) patients, with 1.85 million estimated to be in debilitating pain by 2030. Subthalamic deep brain stimulation (STN DBS) programmed for treating PD motor symptoms has also been shown to significantly improve pain scores. However, even though most patients' pain symptoms improve or disappear, 74% of patients treated develop new pain symptoms within 8 years. Previously we have shown that duloxetine and STN high frequency stimulation (HFS) significantly increase mechanical thresholds more than either alone. The current project specifically investigates the effects of gabapentin and morphine alone and with high (150 Hz; HFS) and low (50 Hz; LFS) frequency stimulation in the 6-hydroxydopamine rat model for PD. We found that HFS, LFS, gabapentin 15 mg/kg and morphine 1 mg/kg all independently improve von Frey (VF) thresholds. Neither drug augments the HFS response significantly. Morphine at 1 mg/kg showed a trend to increasing thresholds compared to LFS alone (p = 0.062). Interestingly, gabapentin significantly reduced (p = 0.019) the improved VF thresholds and Randall Selitto thresholds seen with LFS. Thus, though neither drug augments DBS, we found effects of both compounds independently increase VF thresholds, informing use of our model of chronic pain in PD. Gabapentin's reversal of LFS effects warrants further exploration.
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Affiliation(s)
- Brian C Kaszuba
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Teresa Maietta
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Ian Walling
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Paul Feustel
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Amelia Stapleton
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Damian S Shin
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States
| | - Julia Slyer
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States; Department of Neurosurgery, Albany Medical Center, Albany, NY, United States
| | - Julie G Pilitsis
- Department of Neuroscience & Experimental Therapeutics, Albany Medical College, Albany, NY, United States; Department of Neurosurgery, Albany Medical Center, Albany, NY, United States.
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Adams SD, Bennet KE, Tye SJ, Berk M, Kouzani AZ. Development of a miniature device for emerging deep brain stimulation paradigms. PLoS One 2019; 14:e0212554. [PMID: 30789946 PMCID: PMC6383994 DOI: 10.1371/journal.pone.0212554] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 02/05/2019] [Indexed: 11/18/2022] Open
Abstract
Deep brain stimulation (DBS) is a neuromodulatory approach for treatment of several neurological and psychiatric disorders. A new focus on optimising the waveforms used for stimulation is emerging regarding the mechanism of DBS treatment. Many existing DBS devices offer only a limited set of predefined waveforms, mainly rectangular, and hence are inapt for exploring the emerging paradigm. Advances in clinical DBS are moving towards incorporating new stimulation parameters, yet we remain limited in our capacity to test these in animal models, arguably a critical first step. Accordingly, there is a need for the development of new miniature, low-power devices to enable investigation into the new DBS paradigms in preclinical settings. The ideal device would allow for flexibility in the stimulation waveforms, while remaining suitable for chronic, tetherless, biphasic deep brain stimulation. In this work, we elucidate several key parameters in a DBS system, identify gaps in existing solutions, and propose a new device to support preclinical DBS. The device allows for a high degree of flexibility in the output waveform with easily altered shape, frequency, pulse-width and amplitude. The device is suitable for both traditional and modern stimulation schemes, including those using non-rectangular waveforms, as well as delayed feedback schemes. The device incorporates active charge balancing to ensure safe operation, and allows for simple production of custom biphasic waveforms. This custom waveform output is unique in the field of preclinical DBS devices, and could be advantageous in performing future DBS studies investigating new treatment paradigms. This tetherless device can be easily and comfortably carried by an animal in a back-mountable configuration. The results of in-vitro tests are presented and discussed.
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Affiliation(s)
- Scott D. Adams
- Deakin University, School of Engineering, Geelong, Victoria, Australia
| | - Kevin E. Bennet
- Division of Engineering, Mayo Clinic, Rochester, MN, United States of America
| | - Susannah J. Tye
- Queensland Brain Institute, the University of Queensland, St Lucia QLD, Australia
| | - Michael Berk
- Deakin University, School of Medicine, IMPACT SRC, Barwon Health, Geelong, Victoria, Australia
| | - Abbas Z. Kouzani
- Deakin University, School of Engineering, Geelong, Victoria, Australia
- * E-mail:
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Krukiewicz K, Janas D, Vallejo-Giraldo C, Biggs MJ. Self-supporting carbon nanotube films as flexible neural interfaces. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.10.157] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Chen S, Gao G, Feng T, Zhang J. Chinese expert consensus on programming deep brain stimulation for patients with Parkinson's disease. Transl Neurodegener 2018; 7:11. [PMID: 29719720 PMCID: PMC5925823 DOI: 10.1186/s40035-018-0116-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 04/12/2018] [Indexed: 11/18/2022] Open
Abstract
Background Deep Brain Stimulation (DBS) therapy for the treatment of Parkinson’s Disease (PD) is now a well-established option for some patients. Postoperative standardized programming processes can improve the level of postoperative management and programming, relieve symptoms and improve quality of life. Main body In order to improve the quality of the programming, the experts on DBS and PD in neurology and neurosurgery in China reviewed the relevant literatures and combined their own experiences and developed this expert consensus on the programming of deep brain stimulation in patients with PD in China. Conclusion This Chinese expert consensus on postoperative programming can standardize and improve postoperative management and programming of DBS for PD.
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Affiliation(s)
- Shengdi Chen
- 1Department of Neurology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200025 China
| | - Guodong Gao
- 2Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xian, 710038 China
| | - Tao Feng
- 3Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100050 China
| | - Jianguo Zhang
- 4Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100050 China
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Gandolfi M, Geroin C, Antonini A, Smania N, Tinazzi M. Understanding and Treating Pain Syndromes in Parkinson's Disease. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2017; 134:827-858. [PMID: 28805585 DOI: 10.1016/bs.irn.2017.05.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pain affects many people with Parkinson's disease (PD) and diminishes their quality of life. Different types of pain have been described, but their related pathophysiological mechanisms remain unclear. The aim of this chapter is to provide movement disorders specialists an update about the pathophysiology of pain and a practical guide for the management of pain syndromes in clinical practice. This chapter reviews current knowledge on the pathophysiological mechanisms of sensory changes and pain in PD, as well as assessment and treatment procedures to manage these symptoms. In summary, changes in peripheral and central pain processing have been demonstrated in PD patients. A decrease in pain threshold and tolerance to several stimuli, a reduced nociceptive withdrawal reflex, a reduced pain threshold, and abnormal pain-induced activation in cortical pain-related areas have been reported. There is no direct association between improvement of motor symptoms and sensory/pain changes, suggesting that motor and nonmotor symptoms do not inevitably share the same mechanisms. Special care in pain assessment in PD is warranted by the specific pathophysiological aspects and the complexity of motor and nonmotor symptoms associated with pain symptoms. Rehabilitation may represent a valid option to manage pain syndromes in PD. However, further research in this field is needed. An integrated approach to pain involving a multidisciplinary team of medical specialists and rehabilitation experts should allow a comprehensive approach to pain in PD.
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Affiliation(s)
- Marialuisa Gandolfi
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy; Neurorehabilitation Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Christian Geroin
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy
| | - Angelo Antonini
- University of Padua and Hospital San Camillo IRCCS, Venice, Italy
| | - Nicola Smania
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy; Neurorehabilitation Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Michele Tinazzi
- Neurology Unit, Movement Disorders Division, University of Verona, Verona, Italy.
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