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ultrasound increased intracranial pressure

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https://www.readbyqxmd.com/read/28495841/lower-body-negative-pressure-decreases-non-invasively-measured-intracranial-pressure-and-internal-jugular-vein-cross-sectional-area-during-head-down-tilt
#1
William Watkins, Alan R Hargens, Shannon Baird, Erika Marie Clary, Brandon R Macias
INTRODUCTION: Long-term space flight induces a near visual acuity change in approximately 50% of astronauts. In some crew members, postflight cerebrospinal fluid (CSF) opening pressures by lumbar puncture are as high as 20.9 mmHg who demonstrated optic disc edema. CSF communicates through the cochlear aqueduct to affect perilymphatic pressure and tympanic membrane motion. We hypothesized that 50 mmHg of lower-body negative pressure (LBNP) during 15° head-down tilt (HDT) would mitigate elevations in internal jugular vein cross-sectional area (IJV CSA) and intracranial pressure (ICP)...
May 11, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28421189/optic-nerve-sheath-diameter-ultrasound-evaluation-in-intensive-care-unit-possible-role-and-clinical-aspects-in-neurological-critical-patients-daily-monitoring
#2
M Toscano, G Spadetta, P Pulitano, M Rocco, V Di Piero, O Mecarelli, E Vicenzini
Background. The increase of the optic nerve sheath diameter (ONSD) is a reliable, noninvasive sonographic marker of intracranial hypertension. Aim of the study was to demonstrate the efficacy of ONSD evaluation, when monitoring neurocritical patients, to early identify malignant intracranial hypertension in patients with brain death (BD). Methods. Data from ultrasound ONSD evaluation have been retrospectively analyzed in 21 sedated critical patients with neurological diseases who, during their clinical course, developed BD...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28417833/jugular-and-portal-vein-volume-middle-cerebral-vein-velocity-and-intracranial-pressure-in-dry-immersion
#3
Philippe Arbeille, Paul Avan, Loïc Treffel, Kathryn Zuj, Herve Normand, Pierre Denise
BACKGROUND: The objective was to determine if short term exposure to dry immersion (DI) results in a cephalic fluid shift similar to what has been observed with spaceflight. METHODS: Data were collected from 10 individuals at rest and during the first 2 h of dry immersion. Jugular vein (JV), portal vein (PV), and thyroid volume were measured using 3D echography. Middle cerebral vein velocity (MCVv) was determined using transcranial Doppler ultrasound. The cochlear response to audio stimulation was used to derive an estimate of intracranial pressure (dICP)...
May 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28386682/-update-in-neuroanesthesiology-key-publications
#4
V-S Eckle, G Schneider
One of the aims of the Scientific Working Group Neuroanesthesia (WAKNA) of the German Society of Anesthesiology and Intensive Care Medicine is to disseminate new findings in the field of neuroscience and neuroanesthesia and to propagate novel therapeutic and diagnostic options into clinical practice. Once a year, the WAKNA displays and discusses recent noteworthy publications from the past 12 months at the German Anesthesia Meeting. In 2016, a new pharmacologic strategy with dexmedetomidine to prevent postoperative pain after craniotomy, the impact of the widely used anesthetic drug propofol on GABA receptor surface expression, a study highlighting the ultrasound-guided detection of increased intracranial pressure, and an article showing the interactions of neuromuscular blocking drugs on the BIS neuromonitoring were presented...
April 6, 2017: Der Anaesthesist
https://www.readbyqxmd.com/read/28383859/-ultrasonographic-measurement-of-the-optical-nerve-sheath-for-the-diagnosis-of-intracranial-hypertension-in-the-emergency-room-a-case-report
#5
R Levy, B Kerzmann, V Franssen, A S Schwab, J F Adam, Th Sottiaux
Early diagnosis and treatment of intracranial hypertension (ICHT) are major components of the management of neurological emergencies. The optic nerve sheath diameter is closely dependent on intracranial pressure and can be measured by bedside ultrasound (US). We report the story of a 70-year-old COPD patient initially admitted to the emergency room for a sepsis of pulmonary origin. An unusual confusion prompted us to perform an US of the optic nerve sheath. This exam clearly suggested the presence of an ICHT...
June 2016: Revue Médicale de Liège
https://www.readbyqxmd.com/read/28291455/measuring-hemodynamic-changes-in-the-ophthalmic-artery-during-applied-force-for-noninvasive-intracranial-pressure-monitoring-test-results-in-a-porcine-model
#6
Max Twedt, Chase Pfeifer, William Thorell, Greg Bashford
Possible traumatic brain injury victims would greatly benefit from a handheld, noninvasive intracranial pressure (ICP) monitoring tool, which a medic could operate in a remote area. Such a device would also benefit the transport of injured soldiers during en route medical care and critical care air transport. This study demonstrates the use of noninvasive blood flow measurements in the eye by ultrasound as a proxy for ICP. ICP was artificially raised in a porcine model and resultant blood flow change in the ophthalmic artery was measured...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28283997/decision-support-system-for-detection-of-papilledema-through-fundus-retinal-images
#7
Shahzad Akbar, Muhammad Usman Akram, Muhammad Sharif, Anam Tariq, Ubaid Ullah Yasin
A condition in which the optic nerve inside the eye is swelled due to increased intracranial pressure is known as papilledema. The abnormalities due to papilledema such as opacification of Retinal Nerve Fiber Layer (RNFL), dilated optic disc capillaries, blurred disc margins, absence of venous pulsations, elevation of optic disc, obscuration of optic disc vessels, dilation of optic disc veins, optic disc splinter hemorrhages, cotton wool spots and hard exudates may result in complete vision loss. The ophthalmologists detect papilledema by means of an ophthalmoscope, Computed Tomography (CT), Magnetic Resonance Imaging (MRI) and ultrasound...
April 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28165334/sensitivity-of-simulated-transcranial-ultrasound-fields-to-acoustic-medium-property-maps
#8
James Robertson, Eleanor Martin, Ben Cox, Bradley E Treeby
High intensity transcranial focused ultrasound is an FDA approved treatment for essential tremor, while low-intensity applications such as neurostimulation and opening the blood brain barrier are under active research. Simulations of transcranial ultrasound propagation are used both for focusing through the skull, and predicting intracranial fields. Maps of the skull acoustic properties are necessary for accurate simulations, and can be derived from medical images using a variety of methods. The skull maps range from segmented, homogeneous models, to fully heterogeneous models derived from medical image intensity...
April 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27921038/the-clinical-manifestation-and-management-of-autosomal-dominant-polycystic-kidney-disease-in-china
#9
REVIEW
Cheng Xue, Chen-Chen Zhou, Ming Wu, Chang-Lin Mei
BACKGROUND: Autosomal dominant polycystic kidney disease (ADPKD) is the most common monogenic hereditary kidney disease characterized by progressive enlargement of renal cysts. The incidence is 1-2‰ worldwide. Mutations in two genes (PKD1 and PKD2) cause ADPKD. Currently, there is no pharmaceutical treatment available for ADPKD patients in China. Summary: This review focused on advances in clinical manifestation, gene diagnosis, risk factors, and management of ADPKD in China. There is an age-dependent increase in total kidney volume (TKV) and decrease in renal function in Chinese ADPKD patients...
October 2016: Kidney Diseases
https://www.readbyqxmd.com/read/27634108/the-effects-of-superimposed-tilt-and-lower-body-negative-pressure-on-anterior-and-posterior-cerebral-circulations
#10
Michael M Tymko, Caroline A Rickards, Rachel J Skow, Nathan C Ingram-Cotton, Michael K Howatt, Trevor A Day
Steady-state tilt has no effect on cerebrovascular reactivity to increases in the partial pressure of end-tidal carbon dioxide (PETCO2). However, the anterior and posterior cerebral circulations may respond differently to a variety of stimuli that alter central blood volume, including lower body negative pressure (LBNP). Little is known about the superimposed effects of head-up tilt (HUT; decreased central blood volume and intracranial pressure) and head-down tilt (HDT; increased central blood volume and intracranial pressure), and LBNP on cerebral blood flow (CBF) responses...
September 2016: Physiological Reports
https://www.readbyqxmd.com/read/27585209/update-on-the-evaluation-of-pediatric-idiopathic-intracranial-hypertension
#11
REVIEW
Aubrey L Gilbert, Gena Heidary
PURPOSE OF REVIEW: Papilledema associated with idiopathic intracranial hypertension (IIH) may result in irreversible, progressive visual loss. The development of tools for the evaluation of pediatric patients with IIH is particularly relevant as many patients may not be able to comply with the detailed clinical evaluation utilized in adults for the treatment and management of this disease. The purpose of this review is to summarize relevant articles on the diagnostic tools used in evaluation and management of pediatric IIH...
November 2016: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27519599/sports-ultrasound-applications-beyond-the-musculoskeletal-system
#12
REVIEW
Jonathan T Finnoff, Jeremiah Ray, Gianmichael Corrado, Deanna Kerkhof, John Hill
BACKGROUND: Traditionally, ultrasound has been used to evaluate musculoskeletal injuries in athletes; however, ultrasound applications extend well beyond musculoskeletal conditions, many of which are pertinent to athletes. EVIDENCE ACQUISITION: Articles were identified in PubMed using the search terms ultrasound, echocardiogram, preparticipation physical examination, glycogen, focused assessment with sonography of trauma, optic nerve, and vocal cord dysfunction...
September 2016: Sports Health
https://www.readbyqxmd.com/read/27428629/automatic-segmentation-approach-to-extracting-neonatal-cerebral-ventricles-from-3d-ultrasound-images
#13
Wu Qiu, Yimin Chen, Jessica Kishimoto, Sandrine de Ribaupierre, Bernard Chiu, Aaron Fenster, Jing Yuan
Preterm neonates with a very low birth weight of less than 1,500 g are at increased risk for developing intraventricular hemorrhage (IVH). Progressive ventricle dilatation of IVH patients may cause increased intracranial pressure, leading to neurological damage, such as neurodevelopmental delay and cerebral palsy. The technique of 3D ultrasound (US) imaging has been used to quantitatively monitor the ventricular volume in IVH neonates, which may elucidate the ambiguity surrounding the timing of interventions in these patients as 2D clinical US imaging relies on linear measurement and visual estimation of ventricular dilation from a series of 2D slices...
July 9, 2016: Medical Image Analysis
https://www.readbyqxmd.com/read/27351182/noninvasive-methods-of-detecting-increased-intracranial-pressure
#14
REVIEW
Wen Xu, Patrick Gerety, Tomas Aleman, Jordan Swanson, Jesse Taylor
The detection of elevated intracranial pressure (ICP) is of paramount importance in the diagnosis and management of a number of neurologic pathologies. The current gold standard is the use of intraventricular or intraparenchymal catheters; however, this is invasive, expensive, and requires anesthesia. On the other hand, diagnosing intracranial hypertension based on clinical symptoms such as headaches, vomiting, and visual changes lacks sensitivity. As such, there exists a need for a noninvasive yet accurate and reliable method for detecting elevated ICP...
August 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27274403/intracranial-extra-axial-hemangioma-in-a-newborn-a-case-report-and-literature-review
#15
Marcos Dalsin, Rafael Sodré Silva, Jennyfer Paula Galdino Chaves, Francine Hehn Oliveira, Ápio Cláudio Martins Antunes, Leonardo Modesti Vedolin
BACKGROUND: Congenital hemangiomas are benign vascular tumors, and the intracranial counterpart was described in very few cases. CASE DESCRIPTION: A newborn presented with an intracranial tumor associated with an arachnoid cyst, diagnosed by antenatal ultrasound at 37 weeks of gestation. Surgery was indicated due to increased head circumference and bulging fontanelle, and a complete resection of an extra-axial red-brown tumor was performed at the 3(rd) week of life...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27160870/effect-of-different-surgical-positions-on-the-cerebral-venous-drainage-a-pilot-study-using-healthy-volunteers
#16
T Y Yeoh, A Tan, P Manninen, V W S Chan, L Venkatraghavan
Excessive neck flexion and rotation in certain surgical positions may cause kinking of the internal jugular vein that obstructs cerebral venous blood flow and results in elevated intracranial pressure. The objective of this study was to measure internal jugular vein flow and identify potential impediments to venous flow in supine, prone, and park bench positions using non-anaesthetised volunteers. Twenty-seven volunteers were recruited. Venous flow rate was derived from ultrasound measurements of the vessel cross-sectional area and flow velocity...
July 2016: Anaesthesia
https://www.readbyqxmd.com/read/27099800/evidence-for-cerebral-edema-cerebral-perfusion-and-intracranial-pressure-elevations-in-acute-mountain-sickness
#17
Dana M DiPasquale, Stephen R Muza, Andrea M Gunn, Zhi Li, Quan Zhang, N Stuart Harris, Gary E Strangman
INTRODUCTION: We hypothesized that cerebral alterations in edema, perfusion, and/or intracranial pressure (ICP) are related to the development of acute mountain sickness (AMS). METHODS: To vary AMS, we manipulated ambient oxygen, barometric pressure, and exercise duration. Thirty-six subjects were tested before, during and after 8 h exposures in (1) normobaric normoxia (NN; 300 m elevation equivalent); (2) normobaric hypoxia (NH; 4400 m equivalent); and (3) hypobaric hypoxia (HH; 4400 m equivalent)...
March 2016: Brain and Behavior
https://www.readbyqxmd.com/read/26873762/optic-nerve-sheath-diameter-ultrasound-and-the-diagnosis-of-increased-intracranial-pressure
#18
REVIEW
Christopher Hylkema
Ultrasound has been used for almost 30 years in a wide variety of clinical applications and environments. From the austerity of battlefields to the labor and delivery ward, ultrasound has the ability to give clinicians real-time, noninvasive diagnostic imaging. Ultrasound by emergency physicians (and all nonradiologists) has become more prevalent and has been used for examinations such as the transcranial Doppler to evaluate for stroke, cardiac function, FAST and EFAST examinations for trauma, and now increased intracranial pressure (ICP) via Optic Nerve Sheath Diameter Ultrasound (ONSD)...
March 2016: Critical Care Nursing Clinics of North America
https://www.readbyqxmd.com/read/26813857/pulsatile-dynamics-of-the-optic-nerve-sheath-and-intracranial-pressure-an-exploratory-in-vivo-investigation
#19
Llewellyn Padayachy, Reidar Brekken, Graham Fieggen, Tormod Selbekk
BACKGROUND: Raised intracranial pressure (ICP) may lead to increased stiffness of the optic nerve sheath (ONS). OBJECTIVE: To develop a method for analyzing ONS dynamics from transorbital ultrasound and investigate a potential difference between patients with raised ICP vs normal ICP. METHODS: We retrospectively analyzed data from 16 patients (≤12 years old) for whom ultrasound image sequences of the ONS had been acquired from both eyes just before invasive measurement of ICP...
July 2016: Neurosurgery
https://www.readbyqxmd.com/read/26759160/failed-caudal-block-due-to-physiologic-changes-associated-with-a-cerebrospinal-fluid-leak-a-case-report
#20
Erin Bruce, Adam O Spencer, Mehmet Sait Albayram
PURPOSE: The sum of the volumes of brain tissue, cerebrospinal fluid (CSF), and intracranial blood remain constant. This tenet of the Monroe-Kellie hypothesis is most often considered in the setting of intracranial hypertension, but it can also be applied in the setting of CSF volume depletion. We used this hypothesis to explain a case of failed caudal block in a patient with an iatrogenic CSF leak. CLINICAL FEATURES: A one-month-old baby (3 kg) born at 35 weeks' gestation presented for right inguinal hernia repair...
May 2016: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
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