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https://www.readbyqxmd.com/read/28291867/development-and-validation-of-a-brain-phantom-for-therapeutic-cooling-devices
#1
Ryan D M Packett, Philip Brown, Gautam S S Popli, F Scott Gayzik
Tissue cooling is a viable therapy for multiple conditions and injuries, and has been applied to the brain to treat epilepsy and concussions, leading to improved long-term outcomes. To facilitate the study of temperature reduction as a function of various cooling methods, a thermal brain phantom was developed and analyzed. The phantom is composed of a potassium-neutralized, superabsorbent co-polymer hydrogel. The phantom was tested in a series of cooling trials using a cooling block and 37 deg. water representing non-directional blood flow ranging up to 6 GPH, a physiologically representative range based on the prototype volume...
March 14, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28291783/oesophageal-heat-exchangers-with-a-diameter-of-11mm-or-14-7mm-are-equally-effective-and-safe-for-targeted-temperature-management
#2
Daniel C Schroeder, Maria Guschlbauer, Alexandra C Maul, Daniel A Cremer, Ingrid Becker, David de la Puente Bethencourt, Peter Paal, Stephan A Padosch, Wolfgang A Wetsch, Thorsten Annecke, Bernd W Böttiger, Anja Sterner-Kock, Holger Herff
BACKGROUND: Targeted temperature management (TTM) is widely used in critical care settings for conditions including hepatic encephalopathy, hypoxic ischemic encephalopathy, meningitis, myocardial infarction, paediatric cardiac arrest, spinal cord injury, traumatic brain injury, ischemic stroke and sepsis. Furthermore, TTM is a key treatment for patients after out-of-hospital cardiac-arrest (OHCA). However, the optimal cooling method, which is quick, safe and cost-effective still remains controversial...
2017: PloS One
https://www.readbyqxmd.com/read/28282570/paradoxical-vocal-changes-in-a-trained-singer-by-focally-cooling-the-right-superior-temporal-gyrus
#3
Kalman A Katlowitz, Hiroyuki Oya, Matthew A Howard, Jeremy D W Greenlee, Michael A Long
The production and perception of music is preferentially mediated by cortical areas within the right hemisphere, but little is known about how these brain regions individually contribute to this process. In an experienced singer undergoing awake craniotomy, we demonstrated that direct electrical stimulation to a portion of the right posterior superior temporal gyrus (pSTG) selectively interrupted singing but not speaking. We then focally cooled this region to modulate its activity during vocalization. In contrast to similar manipulations in left hemisphere speech production regions, pSTG cooling did not elicit any changes in vocal timing or quality...
February 20, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28268486/identifying-stereotypic-evolving-micro-scale-seizures-sems-in-the-hypoxic-ischemic-eeg-of-the-pre-term-fetal-sheep-with-a-wavelet-type-ii-fuzzy-classifier
#4
Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth
Perinatal hypoxic-ischemic encephalopathy (HIE) around the time of birth due to lack of oxygen can lead to debilitating neurological conditions such as epilepsy and cerebral palsy. Experimental data have shown that brain injury evolves over time, but during the first 6-8 hours after HIE the brain has recovered oxidative metabolism in a latent phase, and brain injury is reversible. Treatments such as therapeutic cerebral hypothermia (brain cooling) are effective when started during the latent phase, and continued for several days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28261573/understanding-the-full-spectrum-of-organ-injury-following-intrapartum-asphyxia
#5
REVIEW
Domenic A LaRosa, Stacey J Ellery, David W Walker, Hayley Dickinson
Birth asphyxia is a significant global health problem, responsible for ~1.2 million neonatal deaths each year worldwide. Those who survive often suffer from a range of health issues including brain damage-manifesting as cerebral palsy (CP)-respiratory insufficiency, cardiovascular collapse, and renal dysfunction, to name a few. Although the majority of research is directed toward reducing the brain injury that results from intrapartum birth asphyxia, the multi-organ injury observed in surviving neonates is of equal importance...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28237918/optimal-control-of-inspired-perfluorocarbon-temperature-for-ultrafast-hypothermia-induction-by-total-liquid-ventilation-in-adult-patient-model
#6
Mathieu Nadeau, Michael Sage, Matthias Kohlhauer, Julien Mousseau, Jonathan Vandamme, Etienne Fortin-Pellerin, Jean-Paul Praud, Renaud Tissier, Herve Walti, Philippe Micheau
OBJECTIVE: Recent preclinical studies have shown that therapeutic hypothermia induced in less than 30 min by total liquid ventilation (TLV) strongly improves the survival rate after cardiac arrest. When the lung is ventilated with a breathable perfluorocarbon liquid, the inspired perfluorocarbon allows to control efficiently the cooling process of the organs. While TLV can rapidly cool animals, the cooling speed in humans remains unknown. The objective is to predict the efficiency and safety of ultrafast cooling by TLV in adult humans...
February 20, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28226660/identifying-stereotypic-evolving-micro-scale-seizures-sems-in-the-hypoxic-ischemic-eeg-of-the-pre-term-fetal-sheep-with-a-wavelet-type-ii-fuzzy-classifier
#7
Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth, Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth, Charles P Unsworth, Laura Bennet, Hamid Abbasi, Alistair J Gunn
Perinatal hypoxic-ischemic encephalopathy (HIE) around the time of birth due to lack of oxygen can lead to debilitating neurological conditions such as epilepsy and cerebral palsy. Experimental data have shown that brain injury evolves over time, but during the first 6-8 hours after HIE the brain has recovered oxidative metabolism in a latent phase, and brain injury is reversible. Treatments such as therapeutic cerebral hypothermia (brain cooling) are effective when started during the latent phase, and continued for several days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225164/effects-of-focal-brain-cooling-on-extracellular-concentrations-of-neurotransmitters-in-patients-with-epilepsy
#8
Sadahiro Nomura, Takao Inoue, Hirochika Imoto, Eiichi Suehiro, Yuichi Maruta, Yuya Hirayama, Michiyasu Suzuki
OBJECTIVE: Brain hypothermia controls epileptic discharge and reduces extracellular concentrations of glutamate (Glu), an excitatory neurotransmitter. We aimed to determine the effects of focal brain cooling (FBC) on levels of γ-aminobutyric acid (GABA), which is a major inhibitory neurotransmitter. The relationship between Glu or GABA concentrations and the severity of epileptic symptoms was also analyzed. METHODS: Patients with intractable epilepsy underwent FBC at lesionectomized (n = 11) or hippocampectomized (n = 8) regions at 15°C for 30 min using custom-made cooling devices...
February 22, 2017: Epilepsia
https://www.readbyqxmd.com/read/28217292/oxygen-or-cooling-to-make-a-decision-after-acute-ischemia-stroke
#9
REVIEW
Wen-Cao Liu, Xin-Chun Jin
The presence of a salvageable penumbra, a region of ischemic brain tissue with sufficient energy for short-term survival, has been widely agreed as the premise for thrombolytic therapy with tissue plasminogen activator (tPA), which remains the only United States Food and Drug Administration (FDA) approved treatment for acute ischemia stroke. However, the use of tPA has been profoundly constrained due to its narrow therapeutic time window and the increased risk of potentially deadly hemorrhagic transformation (HT)...
October 2016: Medical Gas Research
https://www.readbyqxmd.com/read/28217152/value-of-electroencephalographic-monitoring-in-newborns-with-hypoxic-ischemic-encephalopathy-treated-with-hypothermia
#10
Hatem Hamed Elshorbagy, Ahmed A Azab, Naglaa M Kamal, Naglaa Fathy Barseem, Mohamed M Bassiouny, Mostafa A Elsayed, Tohamy H Elkhouly
BACKGROUND: The values of electroencephalography (EEG) in neonatal hypoxic-ischemic encephalopathy (HIE) during therapeutic hypothermia (TH) are still uncertain. AIMS: The aim of this study is to detect EEG background, the prevalence of seizures during cooling, and to determine different EEG patterns that can predict brain injury in magnetic resonance imaging (MRI). PATIENTS AND METHODS: Thirty-nine newborns with HIE were subjected to TH. Continuous monitoring by video-EEG was carried out throughout cooling and during rewarming...
October 2016: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/28215136/protocol-and-statistical-analysis-plan-for-the-randomised-evaluation-of-active-control-of-temperature-versus-ordinary-temperature-management-reactor-trial
#11
Paul J Young, Michael J Bailey, Richard W Beasley, Ross C Freebairn, Naomi E Hammond, Frank M P van Haren, Meg L Harward, Seton J Henderson, Diane M Mackle, Colin J McArthur, Shay P McGuinness, John A Myburgh, Manoj K Saxena, Anne Turner, Steve A R Webb, Rinaldo Bellomo
BACKGROUND: Body temperature can be reduced in febrile patients in the intensive care unit using medicines and physical cooling devices, but it is not known whether systematically preventing and treating fever reduces body temperature compared with standard care. OBJECTIVE: To describe the study protocol and statistical analysis plan for the Randomised Evaluation of Active Control of Temperature versus Ordinary Temperature Management (REACTOR) trial. DESIGN, SETTING AND PARTICIPANTS: Protocol for a phase II, multicentre trial to be conducted in Australian and New Zealand ICUs admitting adult patients...
March 2017: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/28193115/characterization-of-death-in-neonatal-encephalopathy-in-the-hypothermia-era
#12
Monica E Lemmon, Renee D Boss, Sonia L Bonifacio, Audrey Foster-Barber, A James Barkovich, Hannah C Glass
This study aimed to characterize the circumstances of death in encephalopathic neonates treated with therapeutic hypothermia. Patients who died after or during treatment with therapeutic hypothermia between 2007-2014 were identified. Patient circumstance of death was characterized using an established paradigm. Thirty-one of 229 patients died (14%) at a median of 3 days of life. Most who died were severely encephalopathic on examination (90%) and had severely abnormal electroencephalographic (EEG) findings (87%)...
March 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/28185504/artificial-cooling-can-increase-risk-of-death-in-children
#13
(no author information available yet)
Therapeutic hypothermia is proven to reduce the effects of traumatic brain injuries (TBIs) in adults. Researchers of this study found these benefits do not extend to children, however, and that the practice can even increase the likelihood of death.
February 10, 2017: Emergency Nurse: the Journal of the RCN Accident and Emergency Nursing Association
https://www.readbyqxmd.com/read/28176434/network-level-assessment-of-reward-related-activation-in-patients-with-adhd-and-healthy-individuals
#14
Daniel von Rhein, Christian F Beckmann, Barbara Franke, Jaap Oosterlaan, Dirk J Heslenfeld, Pieter J Hoekstra, Catharina A Hartman, Marjolein Luman, Stephen V Faraone, Roshan Cools, Jan K Buitelaar, Maarten Mennes
INTRODUCTION: Reward processing is a key aspect of cognitive control processes, putatively instantiated by mesolimbic and mesocortical brain circuits. Deficient signaling within these circuits has been associated with psychopathology. We applied a network discovery approach to assess specific functional networks associated with reward processing in participants with attention-deficit/hyperactivity disorder (ADHD). METHODS: To describe task-related processes in terms of integrated functional networks, we applied independent component analysis (ICA) to task response maps of 60 healthy participants who performed a monetary incentive delay (MID) task...
February 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28159910/temperature-manipulation-in-songbird-brain-implicates-the-premotor-nucleus-hvc-in-birdsong-syntax
#15
Yisi S Zhang, Jason D Wittenbach, Dezhe Z Jin, Alexay A Kozhevnikov
Variable motor sequences of animals are often structured and can be described by probabilistic transition rules between action elements. Examples include the songs of many songbird species such as the Bengalese finch, which consist of stereotypical syllables sequenced according to probabilistic rules (song syntax). The neural mechanisms behind such rules are poorly understood. Here we investigate where the song syntax is encoded in the brain of the Bengalese finch by rapidly and reversibly manipulating the temperature in the song production pathway...
February 3, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28131890/a-new-generation-of-magnetoencephalography-room-temperature-measurements-using-optically-pumped-magnetometers
#16
Elena Boto, Sofie S Meyer, Vishal Shah, Orang Alem, Svenja Knappe, Peter Kruger, T Mark Fromhold, Mark Lim, Paul M Glover, Peter G Morris, Richard Bowtell, Gareth R Barnes, Matthew J Brookes
Advances in the field of quantum sensing mean that magnetic field sensors, operating at room temperature, are now able to achieve sensitivity similar to that of cryogenically cooled devices (SQUIDs). This means that room temperature magnetoencephalography (MEG), with a greatly increased flexibility of sensor placement can now be considered. Further, these new sensors can be placed directly on the scalp surface giving, theoretically, a large increase in the magnitude of the measured signal. Here, we present recordings made using a single optically-pumped magnetometer (OPM) in combination with a 3D-printed head-cast designed to accurately locate and orient the sensor relative to brain anatomy...
January 25, 2017: NeuroImage
https://www.readbyqxmd.com/read/28101405/deep-tissue-photoacoustic-computed-tomography-with-a-fast-and-compact-laser-system
#17
Depeng Wang, Yuehang Wang, Weiran Wang, Dandan Luo, Upendra Chitgupi, Jumin Geng, Yang Zhou, Lidai Wang, Jonathan F Lovell, Jun Xia
Photoacoustic computed tomography (PACT) holds great promise for biomedical imaging, but wide-spread implementation is impeded by the bulkiness of flash-lamp-pumped laser systems, which typically weigh between 50 - 200 kg, require continuous water cooling, and operate at a low repetition rate. Here, we demonstrate that compact lasers based on emerging diode technologies are well-suited for preclinical and clinical PACT. The diode-pumped laser used in this study had a miniature footprint (13 × 14 × 7 cm(3)), weighed only 1...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28099489/acute-inactivation-of-primary-auditory-cortex-causes-a-sound-localisation-deficit-in-ferrets
#18
Katherine C Wood, Stephen M Town, Huriye Atilgan, Gareth P Jones, Jennifer K Bizley
The objective of this study was to demonstrate the efficacy of acute inactivation of brain areas by cooling in the behaving ferret and to demonstrate that cooling auditory cortex produced a localisation deficit that was specific to auditory stimuli. The effect of cooling on neural activity was measured in anesthetized ferret cortex. The behavioural effect of cooling was determined in a benchmark sound localisation task in which inactivation of primary auditory cortex (A1) is known to impair performance. Cooling strongly suppressed the spontaneous and stimulus-evoked firing rates of cortical neurons when the cooling loop was held at temperatures below 10°C, and this suppression was reversed when the cortical temperature recovered...
2017: PloS One
https://www.readbyqxmd.com/read/28049450/yawning-reduces-facial-temperature-in-the-high-yawning-subline-of-sprague-dawley-rats
#19
Jose R Eguibar, Carlos A Uribe, Carmen Cortes, Amando Bautista, Andrew C Gallup
BACKGROUND: Yawning is a stereotyped behavior that enhances blood flow to the skull, and the resulting counterflow has been hypothesized as a mechanism for brain cooling. Studies have shown that yawns are strongly associated with physiological and pathological conditions that increase brain temperature, and that they are followed by equivalent decreases in brain temperature. However, measured reductions in cranial or facial temperatures following yawning have yet to be reported, to our knowledge...
January 3, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28038481/selective-brain-cooling-after-traumatic-brain-injury-effects-of-three-different-cooling-methods-case-report
#20
Thomas Westermaier, Robert Nickl, Stefan Koehler, Patrick Fricke, Christian Stetter, Stefan Mark Rueckriegel, Ralf-Ingo Ernestus
Background In experimental models of neuronal damage, therapeutic hypothermia proved to be a powerful neuroprotective method. In clinical studies of traumatic brain injury (TBI), this very distinct effect was not reproducible. Several meta-analyses draw different conclusions about whether therapeutic hypothermia can improve outcome after TBI. Adverse side effects of systemic hypothermia, such as severe pneumonia, have been held responsible by some authors to counteract the neuroprotective effect. Selective brain cooling (SBC) attempts to take advantage of the protective effects of therapeutic hypothermia without the adverse side effects of systemic hypothermia...
December 30, 2016: Journal of Neurological Surgery. Part A, Central European Neurosurgery
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