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Optic nerve sheath

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https://www.readbyqxmd.com/read/28918894/effect-of-pneumoperitoneum-and-patient-positioning-on-intracranial-pressures-during-laparoscopy-a-prospective-comparative-study
#1
Nishant Sahay, Shalini Sharma, Umesh K Bhadani, Akhilesh Singh, Chandni Sinha, Anubha Sahay, Alok Ranjan, Mukta Agarwal
STUDY OBJECTIVE: To evaluate the effect of pneumoperitoneum and head position during laparoscopic surgery on intracranial pressures (ICPs) using sonographic measurements of optic nerve sheath diameter (ONSD). DESIGN: Prospective observational study (Canadian Task Force Classification of Study Design II-1). SETTING: A tertiary level hospital. PATIENTS: Sixty-one female patients ages 15 to 50 years with American Society of Anesthesiologists Grade 1 risk and body mass index ≤ 29 kg/m(2) were admitted to the hospital between November 2015 and October 2016 for elective laparoscopic surgery and included in this study...
September 12, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28905110/-indications-and-technique-for-transconjunctival-optic-nerve-sheath-fenestration-video-article
#2
REVIEW
W A Lagrèze, N Gross, J Biermann, L Joachimsen
BACKGROUND: Placement of a ventricular shunt is the primary surgical procedure for lowering intracranial pressure in pseudotumor cerebri syndrome; however, if ophthalmological symptoms prevail over neurological symptoms or if there are no neurological symptoms at all, optic nerve sheath fenestration may be a valuable option for relief of pressure on the retrobulbar optic nerve when papilledema caused by pseudotumor cerebri syndrome threatens vision despite previous conservative measures...
September 13, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28904465/spectrum-of-visual-impairment-in-cerebral-venous-thrombosis-importance-of-tailoring-therapies-based-on-pathophysiology
#3
Sanjith Aaron, Anupriya Arthur, A T Prabakhar, Pavitra Mannam, N K Shyamkumar, Sunithi Mani, Vivek Mathew, Jeyanthi Peter, Ajith Sivadasan, Anika Alexander, M Karthik, Rohith Ninan Benjamin, Mathew Alexander
Visual impairment can complicate cerebral venous thrombosis (CVT). Here, we describe the various pathophysiological mechanisms and treatments available. A retrospective chart review of all patients treated for CVT in a large quaternary teaching hospital was done, and cases with visual impairment due to CVT were identified. The various mechanisms causing visual impairment in CVT were (1) raised intracranial pressure (ICP) caused by venous thrombosis without venous infarcts resulting in a benign intracranial hypertension-like presentation of CVT, (2) venous infarcts involving the occipital cortex, (3) raised ICP following the development of a secondary dural arteriovenous (AV) fistula, and (4) arterial occipital infarcts due to posterior cerebral artery compression secondary to herniation in large venous infarcts...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28902893/correlation-of-optic-nerve-sheath-diameter-with-directly-measured-intracranial-pressure-in-korean-adults-using-bedside-ultrasonography
#4
Jin Pyeong Jeon, Si Un Lee, Sung-Eun Kim, Suk Hyung Kang, Jin Seo Yang, Hyuk Jai Choi, Yong Jun Cho, Seung Pil Ban, Hyoung Soo Byoun, Young Soo Kim
OBJECTIVES: The correlation of optic nerve sheath diameter (ONSD) as seen on ultrasonography (US) and directly measured intracranial pressure (ICP) has been well described. Nevertheless, differences in ethnicity and type of ICP monitor used are obstacles to the interpretation. Therefore, we investigated the direct correlation between ONSD and ventricular ICP and defined an optimal cut-off point for identifying increased ICP (IICP) in Korean adults with brain lesions. METHODS: This prospective study included patients who required an external ventricular drainage (EVD) catheter for ICP control...
2017: PloS One
https://www.readbyqxmd.com/read/28892829/author-response-optic-nerve-sheath-distention-as-a-protective-mechanism-against-the-visual-impairment-and-intracranial-pressure-syndrome-in-astronauts
#5
Thomas H Mader, C Robert Gibson, Andrew G Lee
No abstract text is available yet for this article.
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28892828/optic-nerve-sheath-distention-as-a-protective-mechanism-against-the-visual-impairment-and-intracranial-pressure-syndrome-in-astronauts
#6
Peter Wostyn, Peter Paul De Deyn
No abstract text is available yet for this article.
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28875121/spontaneous-cerebrospinal-fluid-rhinorrhea-association-with-body-weight-and-imaging-data
#7
Raphaële Quatre, Arnaud Attye, Christian Adrien Righini, Emile Reyt, Joris Giai, Sébastien Schmerber, Alexandre Karkas
Objective  Spontaneous cerebrospinal fluid rhinorrhea (SCSFR) might be the only clinical manifestation of idiopathic intracranial hypertension (IIH), which has been historically related to overweight. Our goal was to search for an association between SCSFR and increased body weight on the one hand and SCSFR and imaging findings suggestive of IIH on the other hand. Materials and Methods  We retrospectively collected clinical and radiological data of patients operated on endoscopically for SCSFR in our institution from 1993 to 2013...
October 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28869392/intracranial-pressure-induced-optic-nerve-sheath-response-as-a-predictive-biomarker-for-optic-disc-edema-in-astronauts
#8
Peter Wostyn, Peter Paul De Deyn
A significant proportion of the astronauts who spend extended periods in microgravity develop ophthalmic abnormalities. Understanding this syndrome, called visual impairment and intracranial pressure (VIIP), has become a high priority for National Aeronautics and Space Administration, especially in view of future long-duration missions (e.g., Mars missions). Moreover, to ensure selection of astronaut candidates who will be able to complete long-duration missions with low risk of the VIIP syndrome, it is imperative to identify biomarkers for VIIP risk prediction...
September 4, 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/28865838/placement-of-a-cervical-collar-increases-the-optic-nerve-sheath-diameter-in-healthy-adults
#9
Casey M Woster, Michael D Zwank, Joseph R Pasquarella, Sandi S Wewerka, Jeffrey P Anderson, Jessica T Greupner, Sakib Motalib
INTRODUCTION: Blunt head trauma is a common cause of increased intracranial pressure (ICP). Ultrasound measurement of the optic nerve sheath diameter (OSND) is an accurate and non-invasive way to detect increased ICP. Blunt trauma patients are often immobilized in a rigid cervical spine collar. Our objective was to describe the changes in ONSD following the placement of a c-collar and determine if any changes were time-dependent. METHODS: We performed a prospective cohort study measuring the ONSD of healthy volunteers before and after placement of a c-collar...
August 26, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28851966/ahr-deficiency-as-a-cause-of-demyelinating-disease-and-inflammation
#10
Ludmila Juricek, Julie Carcaud, Alice Pelhaitre, Thorfinn T Riday, Aline Chevallier, Justine Lanzini, Nicolas Auzeil, Olivier Laprévote, Florent Dumont, Sebastien Jacques, Frank Letourneur, Charbel Massaad, Cendra Agulhon, Robert Barouki, Mathieu Beraneck, Xavier Coumoul
The Aryl hydrocarbon Receptor(AhR) is among the most important receptors which bind pollutants; however it also regulates signaling pathways independently of such exposure. We previously demonstrated that AhR is expressed during development of the central nervous system(CNS) and that its deletion leads to the occurrence of a congenital nystagmus. Objectives of the present study are to decipher the origin of these deficits, and to identify the role of the AhR in the development of the CNS. We show that the AhR-knockout phenotype develops during early infancy together with deficits in visual-information-processing which are associated with an altered optic nerve myelin sheath, which exhibits modifications in its lipid composition and in the expression of myelin-associated-glycoprotein(MAG), a cell adhesion molecule involved in myelin-maintenance and glia-axon interaction...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28837816/identification-and-segmentation-of-myelinated-nerve-fibers-in-a-cross-sectional-optical-microscopic-image-using-a-deep-learning-model
#11
Tatsuhiko Naito, Yu Nagashima, Kenichiro Taira, Naohiro Uchio, Shoji Tsuji, Jun Shimizu
BACKGROUND: The morphometric analysis of myelinated nerve fibers of peripheral nerves in cross-sectional optical microscopic images is valuable. Several automated methods for nerve fiber identification and segmentation have been reported. This paper presents a new method that uses a deep learning model of a convolutional neural network (CNN). We tested it for human sural nerve biopsy images. METHODS: The method comprises four steps: normalization, clustering segmentation, myelinated nerve fiber identification, and clump splitting...
August 26, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28829843/magnetic-resonance-imaging-of-optic-nerve-traction-during-adduction-in-primary-open-angle-glaucoma-with-normal-intraocular-pressure
#12
Joseph L Demer, Robert A Clark, Soh Youn Suh, JoAnn A Giaconi, Kouros Nouri-Mahdavi, Simon K Law, Laura Bonelli, Anne L Coleman, Joseph Caprioli
Purpose: We used magnetic resonance imaging (MRI) to ascertain effects of optic nerve (ON) traction in adduction, a phenomenon proposed as neuropathic in primary open-angle glaucoma (POAG). Methods: Seventeen patients with POAG and maximal IOP ≤ 20 mm Hg, and 31 controls underwent MRI in central gaze and 20° to 30° abduction and adduction. Optic nerve and sheath area centroids permitted computation of midorbital lengths versus minimum paths. Results: Average mean deviation (±SEM) was -8...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28818998/lower-body-negative-pressure-reduces-optic-nerve-sheath-diameter-during-head-down-tilt
#13
Karina Marshall-Goebel, Robert Terlević, Darius A Gerlach, Simone Kuehn, Edwin Mulder, Jörn Rittweger
The microgravity ocular syndrome (MOS) results in significant structural and functional ophthalmic changes during 6-month spaceflight missions consistent with an increase in cerebrospinal fluid (CSF) pressure compared to the preflight upright position. A ground-based study was performed to assess two of the major hypothesized contributors to MOS, headward fluid shifting and increased ambient CO2, on intracranial and periorbital CSF. In addition, lower body negative pressure (LBNP) was assessed as a countermeasure to headward fluid shifting...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28812914/retrospective-chart-review-of-the-use-of-imaging-and-biopsy-in-the-diagnosis-of-optic-nerve-sheath-meningiomas-and-intra-conal-orbital-lymphomas-at-a-single-institution
#14
Anna Parlin, Alina Dumitrescu, William T Nunery, Peter J Timoney, Jason A Sokol
Optic nerve sheath meningiomas (ONSM) and intra-conal orbital lymphomas are common entities on the differential of a retrobulbar optic nerve involving space-occupying lesion. In this study, we compare the pre-surgical diagnosis, based on clinical presentation and neuroimaging, to the surgical pathology results of intra-conal orbital lymphomas and ONSM. This is an IRB approved retrospective chart review of orbital lymphomas and optic nerve sheath meningiomas biopsied by a single surgeon over a 4-year period at a single institution...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28801417/optic-nerve-sheath-diameter-sonography-for-the-diagnosis-of-increased-intracranial-pressure-a-systematic-review-and-meta-analysis-protocol
#15
Alex Koziarz, Niv Sne, Fraser Kegel, Waleed Alhazzani, Siddharth Nath, Jetan H Badhiwala, Timothy Rice, Paul Engels, Faidi Samir, Andrew Healey, Kamyar Kahnamoui, Laura Banfield, Sunjay Sharma, Kesava Reddy, Gregory W J Hawryluk, Andrew W Kirkpatrick, Saleh A Almenawer
INTRODUCTION: Increased intracranial pressure (ICP) is a significant neurological issue that may lead to permanent neurological sequelae. When evaluating patients with traumatic brain injury, it is crucial to identify those with high ICP in order to expedite ICP lowering measures and maintain adequate cerebral perfusion. Several measures are used to recognise patients with increased ICP including CT scan, MRI, ICP monitor, and lumbar puncture (LP). However, these tests can be invasive, associated with radiation exposure, contraindicated, or not readily available...
August 11, 2017: BMJ Open
https://www.readbyqxmd.com/read/28771407/imaging-strategies-for-suspected-acute-cranial-shunt-failure-a-cost-effectiveness-analysis
#16
COMPARATIVE STUDY
Jay Pershad, Andrew Taylor, M Kennedy Hall, Paul Klimo
OBJECTIVES: We compared cost-effectiveness of cranial computed tomography (CT), fast sequence magnetic resonance imaging (fsMRI), and ultrasonography measurement of optic nerve sheath diameter (ONSD) for suspected acute shunt failure from the perspective of a health care organization. METHODS: We modeled 4 diagnostic imaging strategies: (1) CT scan, (2) fsMRI, (3) screening ONSD by using point of care ultrasound (POCUS) first, combined with CT, and (4) screening ONSD by using POCUS first, combined with fsMRI...
August 2017: Pediatrics
https://www.readbyqxmd.com/read/28768582/blind-overnight-a-case-of-fulminant-idiopathic-intracranial-hypertension
#17
Janpreet Singh Bhandohal, Taimur Mirza
Idiopathic Intracranial Hypertension (IIH) is a syndrome seen predominantly in obese women of reproductive age group, characterized by signs and symptoms of increased intracranial pressure due to an unknown cause. Some individuals have a more malignant form of disease called fulminant idiopathic intracranial hypertension with rapid worsening of symptoms over days. We report a case of 33year-old obese female (BMI 36.9) who presented with a severe headache and blurred vision for one week, found to have idiopathic intracranial hypertension with rapid worsening of symptoms suggestive of a fulminant course of disease...
July 5, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28746249/optic-nerve-sheath-meningocele-simulating-an-optic-nerve-pit
#18
Sara E Lally, Ann P Murchison, Adam E Flanders, Jurij R Bilyk
No abstract text is available yet for this article.
July 25, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28742869/ultrasound-non-invasive-measurement-of-intracranial-pressure-in-neurointensive-care-a-prospective-observational-study
#19
COMPARATIVE STUDY
Chiara Robba, Danilo Cardim, Tamara Tajsic, Justine Pietersen, Michael Bulman, Joseph Donnelly, Andrea Lavinio, Arun Gupta, David K Menon, Peter J A Hutchinson, Marek Czosnyka
BACKGROUND: The invasive nature of the current methods for monitoring of intracranial pressure (ICP) has prevented their use in many clinical situations. Several attempts have been made to develop methods to monitor ICP non-invasively. The aim of this study is to assess the relationship between ultrasound-based non-invasive ICP (nICP) and invasive ICP measurement in neurocritical care patients. METHODS AND FINDINGS: This was a prospective, single-cohort observational study of patients admitted to a tertiary neurocritical care unit...
July 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28736129/clinical-and-radiological-predictors-of-malignant-middle-cerebral-artery-infarction-development-and-outcomes
#20
Angelique F Albert, Matthew A Kirkman
BACKGROUND: Optic nerve sheath diameter (ONSD) can predict intracranial hypertension and outcomes in severe traumatic brain injury. Its utility in middle cerebral artery (MCA) stroke is unknown. AIMS: We reviewed serial radiological measurements, including ONSD, in patients with MCA stroke undergoing decompressive craniectomy (DC) for malignant MCA syndrome and compared demographic, clinical, and radiological data with an age- and gender-matched group of nonmalignant MCA stroke patients...
July 20, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
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