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Stereotactic and Functional Neurosurgery

Josue M Avecillas-Chasin, Anujan Poologaindran, Murray D Morrison, Linda A Rammage, Christopher R Honey
BACKGROUND: Voice tremor (VT) is the involuntary and rhythmical phonatory instability of the voice. Recent findings suggest that unilateral deep brain stimulation of the ventral intermediate nucleus (Vim-DBS) can sometimes be effective for VT. In this exploratory analysis, we investigated the effect of Vim-DBS on VT and tested the hypothesis that unilateral thalamic stimulation is effective for patients with VT. METHODS: Seven patients with VT and previously implanted bilateral Vim-DBS were enrolled in the study...
January 9, 2019: Stereotactic and Functional Neurosurgery
Jonathan J Lee, Saeed S Sadrameli, Virendra R Desai, Ryan J Austerman, Dean M Leonard, Brian D Dalm
BACKGROUND: Spinal cord stimulation (SCS) is a well-established treatment modality for chronic pain. Thoracic radiculopathy has been reported as a complication of SCS paddle lead implantation by several authors and commonly presents as abdominal pain. METHODS: We performed a search of all patients who underwent either placement of a new epidural paddle lead electrode or revision of an epidural paddle lead electrode for SCS in the thoracic region from January 2017 to January 2018...
January 3, 2019: Stereotactic and Functional Neurosurgery
Julien Engelhardt, Dominique Guehl, Nathalie Damon-Perrière, Olivier Branchard, Pierre Burbaud, Emmanuel Cuny
BACKGROUND: The control of the anatomic position of the active contacts is essential to understand the effects and adapt the settings of the neurostimulation. The localization is commonly assessed by a registration between the preoperative MRI and the postoperative CT scan. However, its accuracy depends on the quality of the registration algorithm and many software programs are available. OBJECTIVE: To compare the localization of implanted deep brain stimulation (DBS) leads in the subthalamic nucleus (STN) between four registration devices...
December 19, 2018: Stereotactic and Functional Neurosurgery
Nina Zech, Milena Seemann, Timo F Seyfried, Max Lange, Juergen Schlaier, Ernil Hansen
BACKGROUND: Sedatives and opioids used during deep brain stimulation (DBS) surgery interfere with optimal target localization and add to side effects and risks, and thus should be minimized. OBJECTIVE: To retrospectively test the actual need for sedatives and opioids when cranial nerve blocks and specific therapeutic communication are applied. METHODS: In a case series, 64 consecutive patients treated with a strong rapport, constant contact, non-verbal communication and hypnotic suggestions, such as dissociation to a "safe place," reframing of disturbing noises and self-confirmation, were compared to 22 preceding patients under standard general anaesthesia or conscious sedation...
December 5, 2018: Stereotactic and Functional Neurosurgery
Camilla Kilbane, Jennifer Witt, Nicholas B Galifianakis, Graham A Glass, Monica Volz, Susan Heath, Philip A Starr, Jill Louise Ostrem
BACKGROUND: X-linked dystonia parkinsonism (XDP) causes adult-onset progressive dystonia and parkinsonism, which may not respond to pharmacotherapy. OBJECTIVE: Previous case reports have reported beneficial effects from bilateral pallidal (GPi) deep brain stimulation (DBS). Here, we report the long-term clinical outcomes of 3 patients treated at our center. METHODS: All patients presented with medication refractory dystonia and parkinsonism...
November 27, 2018: Stereotactic and Functional Neurosurgery
Alexandra Hellerbach, Till A Dembek, Mauritius Hoevels, Jasmin A Holz, Andreas Gierich, Klaus Luyken, Michael T Barbe, Jochen Wirths, Veerle Visser-Vandewalle, Harald Treuer
BACKGROUND: Directional deep brain stimulation (DBS) allows steering the stimulation in an axial direction which offers greater flexibility in programming. However, accurate anatomical visualization of the lead orientation is required for interpreting the observed stimulation effects and to guide programming. OBJECTIVES: In this study we aimed to develop and test an accurate and robust algorithm for determining the orientation of segmented electrodes based on standard postoperative CT imaging used in DBS...
November 27, 2018: Stereotactic and Functional Neurosurgery
David A Isaacs, Jonathan Butler, Vishad Sukul, William Rodriguez, Srivatsan Pallavaram, Christopher Tolleson, John Y Fang, Fenna T Phibbs, Hong Yu, Peter E Konrad, Peter Hedera
BACKGROUND: Thalamic ventral intermediate nucleus (VIM) deep brain stimulation (DBS) is an effective therapy for medication-refractory essential tremor (ET). However, 13-40% of patients with an initially robust tremor efficacy lose this benefit over time despite reprogramming attempts. At our institution, a cohort of ET patients with VIM DBS underwent implantation of a second anterior (ventralis oralis anterior; VOA) DBS lead to permit "confined stimulation." We sought to assess whether confined stimulation conferred additional tremor capture compared to VIM or VOA stimulation alone...
November 19, 2018: Stereotactic and Functional Neurosurgery
Michael J Gigliotti, Shaakir Hasan, Stephen M Karlovits, Tulika Ranjan, Rodney E Wegner
OBJECTIVE: The aim of this study was to evaluate the efficacy of stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (fSRT) as salvage therapy for recurrent high-grade glioma and to look at the overall efficacy of treatment with linear accelerator (LINAC)-based radiosurgery and fractionated radiotherapy. METHODS: From 2010 to 2017, a total of 25 patients aged 23-74 years were re-irradiated with LINAC-based SRS and fSRT. Patients were treated to a median dose of 25 Gy in 5 fractions...
November 7, 2018: Stereotactic and Functional Neurosurgery
Min Wu, Xiaofeng Jiang, Chaoshi Niu, Xianming Fu
BACKGROUND: Internal neurolysis (IN) is an effective surgical treatment for trigeminal neuralgia (TN) without neurovascular compression (NVC) or postoperative recurrence. However, the trigeminal nerve is directly manipulated during the procedure, and there is a high incidence of trigeminocardiac reflex (TCR). The aim of this study was to retrospectively analyze the outcome of IN and to explore its relationship with the occurrence of intraoperative TCR. METHODS: Surgical and anesthesia records of 27 TN patients who underwent surgical treatment with IN at our department between March 2010 and September 2016 were retrospectively analyzed...
November 7, 2018: Stereotactic and Functional Neurosurgery
April A Carlson, Ueli Rutishauser, Adam N Mamelak
BACKGROUND: Invasive electrode monitoring provides more precise localization of epileptogenic foci in patients with medically refractory epilepsy. The use of hybrid depth electrodes that include microwires for simultaneous single-neuron monitoring is becoming more widespread. OBJECTIVE: To determine the safety and utility of hybrid depth electrodes for intracranial monitoring of medically refractory epilepsy. METHODS: We reviewed the medical charts of 53 cases of medically refractory epilepsy operated on from 2006 to 2017, where both non-hybrid and hybrid microwire depth electrodes were used for intracranial monitoring...
October 16, 2018: Stereotactic and Functional Neurosurgery
Jonathan R Ellenbogen, Ruth Tuura, Keyoumars Ashkan
No abstract text is available yet for this article.
October 10, 2018: Stereotactic and Functional Neurosurgery
Antti Huotarinen, Riku Kivisaari, Marwan Hariz
BACKGROUND: The widespread use of deep brain stimulation (DBS) for movement disorders has renewed the interest in DBS for psychiatric disorders. Lauri Laitinen was a pioneer of stereotactic psychosurgery in the 1950s to 1970s, especially by introducing the subgenual cingulotomy. Our aim here was to verify the anatomical target used by Laitinen, to report on a patient who underwent this procedure, and to review the literature. MATERIALS AND METHODS: The records of Helsinki University Hospital were searched for psychosurgical cases performed between 1970 and 1974...
October 2, 2018: Stereotactic and Functional Neurosurgery
Mattias Åström, Jennifer Samuelsson, Jonas Roothans, Anders Fytagoridis, Maxim Ryzhkov, Rutger Nijlunsing, Patric Blomstedt
BACKGROUND/AIM: Deep brain stimulation (DBS) is an established neurosurgical treatment that can be used to alleviate symptoms in essential tremor (ET) and other movement disorders. The aim was to develop a method and software tool for the prediction of effective DBS electrode contacts based on probabilistic stimulation maps (PSMs) in patients with ET treated with caudal zona incerta (cZi) DBS. METHODS: A total of 33 patients (37 leads) treated with DBS were evaluated with the Essential Tremor Rating Scale (ETRS) 12 months after surgery...
September 28, 2018: Stereotactic and Functional Neurosurgery
Clemens Neudorfer, Stefan Hunsche, Martin Hellmich, Faycal El Majdoub, Mohammad Maarouf
BACKGROUND/AIMS: Technological advancements had a serious impact on the evolution of robotic systems in stereotactic neurosurgery over the last three decades and may turn robot-assisted stereotactic neurosurgery into a sophisticated alternative to purely mechanical guiding devices. OBJECTIVES: To compare robot-assisted and conventional frame-based deep brain stimulation (DBS) surgery with regard to accuracy, precision, reliability, duration of surgery, intraoperative imaging quality, safety and maintenance using a standardized setup...
2018: Stereotactic and Functional Neurosurgery
Zeiad Y Fayed, Hesham Radwan, Mohamed Aziz, Mohamed Eid, Alia H Mansour, Mohamed Nosseir, Hisham Anwer, Tarek Elserry, Walid A Abdel Ghany
BACKGROUND: The optimum target in surgery for Parkinson's disease (PD) is still controversial, especially in patients with tremor-dominant PD. We aim to compare results in tremor-dominant patients undergoing pallidotomy vs. those undergoing simultaneous posteroventral pallidotomy (PVP) and ventral intermediate nucleus (VIM) thalamotomy. METHODS: Twenty-four patients with tremor-dominant PD were included in this study. Twelve patients received unilateral PVP contralateral to the most affected side...
2018: Stereotactic and Functional Neurosurgery
Mahsa Malekmohammadi, Hiro Sparks, Nicholas AuYong, Andrew Hudson, Nader Pouratian
BACKGROUND/AIMS: There are reports that microelectrode recording (MER) can be performed under certain anesthetized conditions for functional confirmation of the optimal deep brain stimulation (DBS) target. However, it is generally accepted that anesthesia affects MER. Due to a potential role of local field potentials (LFPs) in DBS functional mapping, we characterized the effect of propofol on globus pallidus interna (GPi) and externa (GPe) LFPs in Parkinson disease (PD) patients. METHODS: We collected LFPs in 12 awake and anesthetized PD patients undergoing DBS implantation...
2018: Stereotactic and Functional Neurosurgery
Chencheng Zhang, Yingying Zhang, Shikun Zhan, Dianyou Li, Haiyan Jin, Damiaan Denys, Bomin Sun
No abstract text is available yet for this article.
2018: Stereotactic and Functional Neurosurgery
Maarten Bot, Pepijn van den Munckhof, Ben A Schmand, Rob M A de Bie, P Richard Schuurman
OBJECTIVE: To evaluate the possible influence of electrode trajectories penetrating the caudate nucleus (CN) on cognitive outcomes in deep brain stimulation (DBS) surgery for Parkinson's disease (PD). BACKGROUND: It is currently unclear how mandatory CN avoidance during trajectory planning is. DESIGN/METHODS: Electrode trajectories were determined to be inside, outside, or in border region of the CN. Pre- and postoperative neuropsychological tests of each trajectory group were compared in order to evaluate possible differences in cognitive outcomes 12 months after bilateral STN DBS...
2018: Stereotactic and Functional Neurosurgery
Sumito Sato, Mitsuru Dan, Hirofumi Hata, Kazuhiro Miyasaka, Mitsuto Hanihara, Ichiyo Shibahara, Yusuke Inoue, Toshihiro Kumabe
BACKGROUND: One of the most serious complications of stereotactic biopsy is postoperative symptomatic hemorrhage due to injury to the basal perforating arteries such as the lenticulostriate arteries neighboring the basal ganglia lesions. OBJECTIVES: A new target-planning method was proposed to reduce hemorrhagic complications by avoiding injury to the perforating arteries. METHODS: Three-dimensional 3-T time-of-flight (3D 3-T TOF) imaging was applied to delineate the basal perforating arteries such as the lenticulostriate arteries...
2018: Stereotactic and Functional Neurosurgery
Paresh Doshi, Nikhil Chamankar
No abstract text is available yet for this article.
2018: Stereotactic and Functional Neurosurgery
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