Read by QxMD icon Read

Intraparenchymal electrode

Tomokazu Takakura, Yoshihiro Muragaki, Manabu Tamura, Takashi Maruyama, Masayuki Nitta, Chiharu Niki, Takakazu Kawamata
OBJECTIVE The aim of the present study was to evaluate the usefulness of navigated transcranial magnetic stimulation (nTMS) as a prognostic predictor for upper-extremity motor functional recovery from postsurgical neurological deficits. METHODS Preoperative and postoperative nTMS studies were prospectively applied in 14 patients (mean age 39 ± 12 years) who had intraparenchymal brain neoplasms located within or adjacent to the motor eloquent area in the cerebral hemisphere. Mapping by nTMS was done 3 times, i...
January 6, 2017: Journal of Neurosurgery
Ha Son Nguyen, Ninh Doan, Michael Gelsomino, Saman Shabani, Wade Mueller
BACKGROUND: When wounds are benign, diagnosis of deep brain stimulation (DBS) electrode infection and associated intraparenchymal infection can be challenging. Only a couple, such cases exist in literature. Since infections of the central nervous system can be life-threatening, prompt diagnosis is necessary to prevent neurological injury. Employed within the appropriate context, magnetic resonance imaging (MRI) of the brain, as well as laboratory data and clinical presentation, may help guide diagnosis...
2016: Surgical Neurology International
Fedor Panov, Emily Levin, Coralie de Hemptinne, Nicole C Swann, Salman Qasim, Svjetlana Miocinovic, Jill L Ostrem, Philip A Starr
OBJECTIVE Contemporary theories of the pathophysiology of movement disorders emphasize abnormal oscillatory activity in basal ganglia-thalamocortical loops, but these have been studied in humans mainly using depth recordings. Recording from the surface of the cortex using electrocorticography (ECoG) provides a much higher amplitude signal than depth recordings, is less susceptible to deep brain stimulation (DBS) artifacts, and yields a surrogate measure of population spiking via "broadband gamma" (50-200 Hz) activity...
January 2017: Journal of Neurosurgery
Zhiqiang Cui, Longsheng Pan, Huifang Song, Xin Xu, Bainan Xu, Xinguang Yu, Zhipei Ling
OBJECT The degree of clinical improvement achieved by deep brain stimulation (DBS) is largely dependent on the accuracy of lead placement. This study reports on the evaluation of intraoperative MRI (iMRI) for adjusting deviated electrodes to the accurate anatomical position during DBS surgery and acute intracranial changes. METHODS Two hundred and six DBS electrodes were implanted in the subthalamic nucleus (STN) in 110 patients with Parkinson disease. All patients underwent iMRI after implantation to define the accuracy of lead placement...
January 2016: Journal of Neurosurgery
Charles Munyon, Jennifer Sweet, Hans Luders, Samden Lhatoo, Jonathan Miller
BACKGROUND: Successful surgical treatment of epilepsy requires accurate definition of areas of ictal onset and eloquent brain. Although invasive monitoring can help, subdural grids cannot sample sulci or subcortical tissue; traditional stereoelectroencephalography depth electrodes are usually placed too far apart to provide sufficient resolution for mapping. OBJECTIVE: To report a strategy of depth electrode placement in a dense array to allow precise anatomic localization of epileptic and eloquent cortex...
March 2015: Neurosurgery
Abhishek Prasad, Qing-Shan Xue, Robert Dieme, Viswanath Sankar, Roxanne C Mayrand, Toshikazu Nishida, Wolfgang J Streit, Justin C Sanchez
Pt/Ir electrodes have been extensively used in neurophysiology research in recent years as they provide a more inert recording surface as compared to tungsten or stainless steel. While floating microelectrode arrays (FMA) consisting of Pt/Ir electrodes are an option for neuroprosthetic applications, long-term in vivo functional performance characterization of these FMAs is lacking. In this study, we have performed comprehensive abiotic-biotic characterization of Pt/Ir arrays in 12 rats with implant periods ranging from 1 week up to 6 months...
2014: Frontiers in Neuroengineering
Toby Jeffcote, Jason M Hinzman, Sharon L Jewell, Robert M Learney, Clemens Pahl, Christos Tolias, Daniel C Walsh, Sara Hocker, Agnieszka Zakrzewska, Martin E Fabricius, Anthony J Strong, Jed A Hartings, Martyn G Boutelle
BACKGROUND: Spreading depolarization events following ischemic and traumatic brain injury are associated with poor patient outcome. Currently, monitoring these events is limited to patients in whom subdural electrodes can be placed at open craniotomy. This study examined whether these events can be detected using intra-cortical electrodes, opening the way for electrode insertion via burr hole. METHODS: Animal work was carried out on adult Sprague-Dawley rats in a laboratory setting to investigate the feasibility of recording depolarization events...
February 2014: Neurocritical Care
Adolfo Ramirez-Zamora, David Levine, David B Sommer, John Dalfino, Peter Novak, Julie G Pilitsis
Following deep brain stimulation (DBS) surgery, a variety of potential mechanical or functional complications ranging from perioperative events to hardware malfunction may occur. We present 2 patients who developed a unique complication of cyst formation at the tip of the DBS electrode in the absence of infection. One patient had a unilateral ventral intermediate lead placement for essential tremor, and the other had bilateral subthalamic nucleus (STN) placement for Parkinson's disease. After a period of symptom control, at 3 and 8 months after surgery, respectively, both patients developed new neurological deficits and were found to have a cyst at the left DBS lead tip...
2013: Stereotactic and Functional Neurosurgery
Atte Karppinen, Aki Laakso, Göran Blomstedt, Maria Peltola, Leena Lauronen, Liisa Metsähonkala, Eija Gaily
Epilepsy work-up is based on history and scalp EEG. Drug resistant epilepsy should be evaluated in a dedicated epilepsy surgery unit. Sometimes non-invasive studies fail to localize the epileptogenic area in focal epilepsy and then the work up can be complemented with intracranial EEG. Intracranial electrodes are implanted either in the subdural space or intraparenchymally. This is followed by one to two weeks of EEG monitoring in a specialized videotelemetry unit. Intracranial EEG helps to define the borders of the epileptogenic area for resection...
2013: Duodecim; Lääketieteellinen Aikakauskirja
Preston K Manwaring, Karen L Moodie, Alexander Hartov, Kim H Manwaring, Ryan J Halter
BACKGROUND: Electrical impedance tomography (EIT) is a method that can render continuous graphical cross-sectional images of the brain's electrical properties. Because these properties can be altered by variations in water content, shifts in sodium concentration, bleeding, and mass deformation, EIT has promise as a sensitive instrument for head injury monitoring to improve early recognition of deterioration and to observe the benefits of therapeutic intervention. This study presents a swine model of head injury used to determine the detection capabilities of an inexpensive bedside EIT monitoring system with a novel intracranial pressure (ICP)/EIT electrode combination sensor on induced intraparenchymal mass effect, intraparenchymal hemorrhage, and cessation of brain blood flow...
October 2013: Anesthesia and Analgesia
Kim J Burchiel, Shirley McCartney, Albert Lee, Ahmed M Raslan
OBJECT: In this prospective study the authors' objective was to evaluate the accuracy of deep brain stimulation (DBS) electrode placement using image guidance for direct anatomical targeting with intraoperative CT. METHODS: Preoperative 3-T MR images were merged with intraoperative CT images for planning. Electrode targets were anatomical, based on the MR images. A skull-mounted NexFrame system was used for electrode placement, and all procedures were performed under general anesthesia...
August 2013: Journal of Neurosurgery
Chengyuan Wu, James J Evans, Christopher Skidmore, Michael R Sperling, Ashwini D Sharan
OBJECTIVE: Responsive neurostimulation (RNS®) is an investigational treatment modality for intractable focal epilepsy. We analyzed impedance values over time to gain a better understanding of RNS device stability, potential differences between depth and strip electrodes, and general implications of long-term electrode implantation. MATERIALS AND METHODS: Impedance measurements were retrospectively reviewed from seven patients over a 3-year period. Statistical analysis was performed to investigate trends in impedance values over time and to determine if any differences existed between the means and variances of impedance values for the two different electrodes...
January 2013: Neuromodulation: Journal of the International Neuromodulation Society
Maren K L Winkler, Yoash Chassidim, Svetlana Lublinsky, Gajanan S Revankar, Sebastian Major, Eun-Jeung Kang, Ana I Oliveira-Ferreira, Johannes Woitzik, Nora Sandow, Michael Scheel, Alon Friedman, Jens P Dreier
Spreading depolarization describes a sustained neuronal and astroglial depolarization with abrupt ion translocation between intraneuronal and extracellular space leading to a cytotoxic edema and silencing of spontaneous activity. Spreading depolarizations occur abundantly in acutely injured human brain and are assumed to facilitate neuronal death through toxic effects, increased metabolic demand, and inverse neurovascular coupling. Inverse coupling describes severe hypoperfusion in response to spreading depolarization...
November 2012: Epilepsia
Stéphane Derrey, Axel Lebas, Dominique Parain, Marie Gilles Baray, Christophe Marguet, Pierre Freger, François Proust
Intracranial bleeding following stereoelectroencephalography (sEEG) is rare and commonly occurs early after electrode implantation. The authors report the case of a delayed intracranial hematoma following sEEG. This 10-year-old boy was referred to the authors' department to undergo an sEEG study for intractable epilepsy, with the hypothesis of a single localized epileptic zone in the left precentral region. To perform the exploration, 14 depth electrodes were implanted under stereotactic conditions. The results of a postoperative CT scan performed routinely at the end of the surgical procedure were normal...
December 2012: Journal of Neurosurgery. Pediatrics
Abhishek Prasad, Qing-Shan Xue, Viswanath Sankar, Toshikazu Nishida, Gerry Shaw, Wolfgang J Streit, Justin C Sanchez
For nearly 55 years, tungsten microwires have been widely used in neurophysiological experiments in animal models to chronically record neuronal activity. While tungsten microwires initially provide stable recordings, their inability to reliably record high-quality neural signals for tens of years has limited their efficacy for neuroprosthetic applications in humans. Comprehensive understanding of the mechanisms of electrode performance and failure is necessary for developing next generation neural interfaces for humans...
October 2012: Journal of Neural Engineering
Nandor Ludvig, Geza Medveczky, Jacqueline A French, Chad Carlson, Orrin Devinsky, Ruben I Kuzniecky
Intracranial pharmacotherapy is a novel strategy to treat drug refractory, localization-related epilepsies not amenable to resective surgery. The common feature of the method is the use of some type of antiepileptic drug (AED) delivery device placed inside the cranium to prevent or stop focal seizures. This distinguishes it from other nonconventional methods, such as intrathecal pharmacotherapy, electrical neurostimulation, gene therapy, cell transplantation, and local cooling. AED-delivery systems comprise drug releasing polymers and neuroprosthetic devices that can deliver AEDs into the brain via intraparenchymal, ventricular, or transmeningeal routes...
2010: Epilepsy Research and Treatment
Massoud Akhtari, Anatol Bragin, Rex Moats, Andrew Frew, Mark Mandelkern
This study explored the use of non-radioactive 2-deoxy glucose (2DG)-labeled magnetonanoparticles (MNP) and magnetic resonance imaging (MRI) to detect functional activity during rest, peripheral stimulation, and epileptic seizures, in animal models. Non-radioactive 2DG was covalently attached to magnetonanoparticles composed of iron oxide and dextran and intravenous (tail) injections were performed. 2DG-MNP was injected in resting and stimulated naïve rodents and the subsequent MRI was compared to published (14)C-2DG autoradiography data...
October 2012: Brain Topography
P Van Loo, E Carrette, A Meurs, L Goossens, D Van Roost, K Vonck, P Boon
Invasive monitoring with intracranial electrodes continues to play a critical role in the presurgical evaluation of patients with medically intractable epilepsy. Intracranial monitoring helps in localizing the epileptogenic zone and can be used to delineate eloquent cortical areas adjacent to this zone. In this review we analyzed surgical successes and failures of invasive video-electroencephalography (EEG) monitoring. Thorough understanding of all potential complications is of paramount importance not only for detection and successful management of intractable epilepsy but also for medicolegal purposes, as patients and their relatives need to be fully informed about the possible risks associated with invasive monitoring...
December 2011: Panminerva Medica
Carter D Wray, Diana L Kraemer, Tong Yang, Sandra L Poliachik, Andrew L Ko, Andrew Poliakov, Adam O Hebb, Edward J Novotny, Jeffrey G Ojemann
The presurgical evaluation of patients with epilepsy often requires an intracranial study in which both subdural grid electrodes and depth electrodes are needed. Performing a craniotomy for grid placement with a stereotactic frame in place can be problematic, especially in young children, leading some surgeons to consider frameless stereotaxy for such surgery. The authors report on the use of a system that uses electromagnetic impulses to track the tip of the depth electrode. Ten pediatric patients with medically refractory focal lobar epilepsy required placement of both subdural grid and intraparenchymal depth electrodes to map seizure onset...
November 2011: Journal of Neurosurgery. Pediatrics
Olivia O Huston, Robert E Watson, Matt A Bernstein, Kiaran P McGee, S Matt Stead, Debb A Gorman, Kendall H Lee, John Huston
OBJECT: Deep brain stimulation (DBS) is an established neurosurgical technique used to treat a variety of neurological disorders, including Parkinson disease, essential tremor, dystonia, epilepsy, depression, and obsessive-compulsive disorder. This study reports on the use of intraoperative MR imaging during DBS surgery to evaluate acute hemorrhage, intracranial air, brain shift, and accuracy of lead placement. METHODS: During a 46-month period, 143 patients underwent 152 DBS surgeries including 289 lead placements utilizing intraoperative 1...
October 2011: Journal of Neurosurgery
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"