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https://www.readbyqxmd.com/read/28637118/asymptomatic-chiari-type-i-malformation-should-patients-be-advised-against-participation-in-contact-sports
#1
Robert Spencer, Paul Leach
BACKGROUND: Chiari type I malformation (CM-I) is characterised by caudal displacement of the cerebellar tonsils through the foramen magnum, crowding the craniocervical junction. It is being increasingly diagnosed in asymptomatic patients due to the widespread availability of MRI, and there are case reports of these patients suffering sudden death or neurological injury following head or neck trauma, raising the issue of whether they should be prohibited from contact sport participation, given the likelihood of frequent trauma...
March 2, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28632646/the-utility-of-adding-magnetic-resonance-imaging-to-computed-tomography-alone-in-the-evaluation-of-cervical-spine-injury-a-propensity-matched-analysis
#2
Andrew J Schoenfeld, Daniel G Tobert, Hai V Le, Dana A Leonard, Allan L Yau, Prashant Rajan, Charles H Cho, James D Kang, Christopher M Bono, Mitchel B Harris
STUDY DESIGN: Adult patients who received CT alone or CT-MRI for the evaluation of cervical OBJECTIVE.: To evaluate the utility of CT-MRI in the diagnosis of cervical spine injury using propensity matched techniques. SUMMARY OF BACKGROUND DATA: The optimal evaluation (computed tomography [CT] alone vs CT and magnetic resonance imaging [MRI]) for patients with suspected cervical spine injury in the setting of blunt trauma remains controversial. METHODS: The primary outcome was the identification of a cervical spine injury, with decision for surgery and change in management considered secondarily...
June 19, 2017: Spine
https://www.readbyqxmd.com/read/28632492/is-the-location-of-the-signal-intensity-weighted-centroid-a-reliable-measurement-of-fluid-displacement-within-the-disc
#3
Vahid Abdollah, Eric C Parent, Michele C Battié
Degenerated discs have shorter T2-relaxation time and lower MR signal. The location of the signal-intensity-weighted-centroid reflects the water distribution within a region-of-interest (ROI). This study compared the reliability of the location of the signal-intensity-weighted-centroid to mean signal intensity and area measurements. L4-L5 and L5-S1 discs were measured on 43 mid-sagittal T2-weighted 3T MRI images in adults with back pain. One rater analysed images twice and another once, blinded to measurements...
June 20, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28629565/a-tri-exponential-model-for-intravoxel-incoherent-motion-analysis-of-the-human-kidney-in-silico-and-during-pharmacological-renal-perfusion-modulation
#4
René van der Bel, Oliver J Gurney-Champion, Martijn Froeling, Erik S G Stroes, Aart J Nederveen, C T Paul Krediet
In the kidneys, there is both blood flow through the capillaries and flow of pre-urine through the tubuli and collecting ducts. We hypothesized that diffusion-weighted (DW) MRI measures both blood and pre-urine flow when using a tri-exponential intravoxel incoherent motion (IVIM) model. Our aim was to systematically investigate and optimize tri-exponential IVIM-analysis for the kidney and test its sensitivity to renal perfusion changes in humans. The tri-exponential fit probes the diffusion coefficient (D), the intermediate (D*i) and fast (D*f) pseudo-diffusion coefficients, and their signal fractions, fD, fi and ff...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28625903/the-need-for-clinical-practice-guidelines-in-assessing-and-managing-perioperative-neurologic-deficit-results-from-a-survey-of-the-aospine-international-community
#5
A Nater, J C Murray, A R Martin, A Nouri, L Tetreault, M G Fehlings
OBJECTIVES: There is no standardized approach to assess and manage perioperative neurologic deficit (PND) in patients undergoing spinal surgery. This survey aimed to evaluate the awareness and usage of clinical practice guidelines (CPGs) as well as investigate how surgeons performing spine surgeries feel about and manage PND, and how they perceive the value of developing CPGs for the management of PND. METHODS: An invitation to participate was sent to the AOSpine International community...
June 15, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28622625/cigarette-smoking-is-associated-with-amplified-age-related-volume-loss-in-subcortical-brain-regions
#6
Timothy C Durazzo, Dieter J Meyerhoff, Karmen K Yoder, Donna E Murray
BACKGROUND: Magnetic resonance imaging studies of cigarette smoking-related effects on human brain structure have primarily employed voxel-based morphometry, and the most consistently reported finding was smaller volumes or lower density in anterior frontal regions and the insula. Much less is known about the effects of smoking on subcortical regions. We compared smokers and non-smokers on regional subcortical volumes, and predicted that smokers demonstrate greater age-related volume loss across subcortical regions than non-smokers...
June 7, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28621768/imaging-and-fluid-biomarkers-in-frontotemporal-dementia
#7
REVIEW
Lieke H Meeter, Laura Donker Kaat, Jonathan D Rohrer, John C van Swieten
Frontotemporal dementia (FTD), the second most common type of presenile dementia, is a heterogeneous neurodegenerative disease characterized by progressive behavioural and/or language problems, and includes a range of clinical, genetic and pathological subtypes. The diagnostic process is hampered by this heterogeneity, and correct diagnosis is becoming increasingly important to enable future clinical trials of disease-modifying treatments. Reliable biomarkers will enable us to better discriminate between FTD and other forms of dementia and to predict disease progression in the clinical setting...
June 16, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28620783/advanced-neuroimaging-of-cerebral-small-vessel-disease
#8
REVIEW
Gordon W Blair, Maria Valdez Hernandez, Michael J Thrippleton, Fergus N Doubal, Joanna M Wardlaw
Cerebral small vessel disease (SVD) is characterised by damage to deep grey and white matter structures of the brain and is responsible for a diverse range of clinical problems that include stroke and dementia. In this review, we describe advances in neuroimaging published since January 2015, mainly with magnetic resonance imaging (MRI), that, in general, are improving quantification, observation and investigation of SVD focussing on three areas: quantifying the total SVD burden, imaging brain microstructural integrity and imaging vascular malfunction...
July 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28618406/an-analysis-of-outcome-of-endoscopic-fenestration-of-cavum-septum-pellucidum-cyst-more-grey-than-black-and-white
#9
Suhas Udayakumaran, Chiazor U Onyia, Sandhya Cherkil
BACKGROUND: Cavum septum pellucidum (CSP) and cavum vergae are actually fluid-filled, generally communicating midline cavities located between the third ventricle and corpus callosum. There have been various reports of their association with many behavioral and psychiatric disorders. Infrequently, they have been associated with an obstructive hydrocephalus-like picture. Although the structure and management of CSP has long been known, it has been an enigma as far as functional significance and management indications are concerned...
June 10, 2017: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28617686/imaging-adult-patients-with-coarctation-of-the-aorta
#10
Akanksha N Thakkar, Ponraj Chinnadurai, C Huie Lin
PURPOSE OF REVIEW: To provide an overview of current recommendations and techniques used to image coarctations of the aorta. RECENT FINDINGS: Imaging of coarctation of the aorta in adults is moving away from conventional techniques such as echocardiography and invasive angiography. Echocardiography may assist in making the diagnosis but is limited in its ability to quantify the severity of coarctations. Current guidelines recommend that every patient with a coarctation must undergo a computed tomography (CT) or MRI scan for accurate delineation of morphology...
June 15, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28615420/insulin-resistance-among-obese-middle-aged-is-associated-with-decreased-cerebrovascular-reactivity
#11
Olivia H Frosch, Po Lai Yau, Ricardo S Osorio, Henry Rusinek, Pippa Storey, Antonio Convit
OBJECTIVE: To evaluate differences in cerebrovascular reactivity (CVR) to mild hypercapnia in obese/overweight individuals with and without insulin resistance (IR) compared to comparable lean controls. METHODS: A total of 60 cognitively normal participants (20 lean controls and 24 obese/overweight individuals with and 16 without IR) were evaluated using a high spatial resolution arterial spin labeling MRI technique at rest and during mild hypercapnia. We analyzed group differences in CVR in cerebral cortex and ascertained the relationships between CVR, IR, and body mass index (BMI)...
June 14, 2017: Neurology
https://www.readbyqxmd.com/read/28615151/parkinson-s-disease-patient-preference-and-experience-with-various-methods-of-dbs-lead-placement
#12
Sara C LaHue, Jill L Ostrem, Nicholas B Galifianakis, Marta San Luciano, Nathan Ziman, Sarah Wang, Caroline A Racine, Philip A Starr, Paul S Larson, Maya Katz
INTRODUCTION: Physiology-guided deep brain stimulation (DBS) surgery requires patients to be awake during a portion of the procedure, which may be poorly tolerated. Interventional MRI-guided (iMRI) DBS surgery was developed to use real-time image guidance, obviating the need for patients to be awake during lead placement. METHODS: All English-speaking adults with PD who underwent iMRI DBS between 2010 and 2014 at our Center were invited to participate. Subjects completed a structured interview that explored perioperative preferences and experiences...
April 17, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28612517/two-dimensional-knowledge-based-volumetric-reconstruction-of-the-right-ventricle-documents-short-term-improvement-in-pulmonary-hypertension
#13
Johannes P Schwaiger, Daniel S Knight, Thomas Kaier, Adele Gallimore, Christopher P Denton, Benjamin E Schreiber, Clive Handler, John G Coghlan
BACKGROUND: Data are scarce about short-term right ventricular changes in pulmonary hypertension. Two-dimensional knowledge-based reconstruction of the right ventricle with 2D echocardiography (2DKBR) has been shown to be a valid alternative to Cardiac MRI. PATIENTS AND METHODS: In this longitudinal study 25 pulmonary hypertension patients underwent 2DKBR of the right ventricle, assessment of NT-proBNP levels and functional class at baseline and after a mean follow-up of 6...
June 2017: Echocardiography
https://www.readbyqxmd.com/read/28609470/physical-fitness-and-plasma-leptin-in-women-with-recent-gestational-diabetes
#14
C Gar, M Rottenkolber, H Grallert, F Banning, I Freibothe, V Sacco, C Wichmann, S Reif, A Potzel, V Dauber, C Schendell, N N Sommer, B Wolfarth, J Seissler, A Lechner, U Ferrari
AIMS/HYPOTHESIS: Low physical fitness (PF) is a risk factor for type 2 diabetes mellitus (T2D). Women with a history of gestational diabetes (GDM) are at risk for T2D at a young age, but the role of PF in this population is not clear. PF has also been found to correlate inversely with plasma leptin in previous studies. Here, we examine whether women who had GDM have lower PF than women after a normoglycemic pregnancy and, second, whether PF is associated with plasma leptin, independently of body fat mass...
2017: PloS One
https://www.readbyqxmd.com/read/28609332/the-use-of-intranasal-dexmedetomidine-and-midazolam-for-sedated-magnetic-resonance-imaging-in-children-a-report-from-the-pediatric-sedation-research-consortium
#15
Carmen Sulton, Pradip Kamat, Michael Mallory, Jason Reynolds
OBJECTIVE: The objective of this study was to describe the use of intranasal dexmedetomidine (IN DEX) for sedated magnetic resonance imaging (MRI) examinations in children. The use of IN DEX for MRI in children has not been well described in the literature. MATERIALS AND METHODS: The Pediatric Sedation Research Consortium (PSRC) is a collaborative and multidisciplinary group of sedation practitioners dedicated to understanding and improving the process of pediatric sedation...
June 12, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28598142/arthroscopic-eminoplasty-a-new-choice-of-treatment-for-tmj-internal-derangement
#16
Blas Garcia Medina, Paolo Cariati, Pablo Galvez, Almudena Cabello Serrano, Miguel Garcia Martin
BACKGROUND: Temporomandibular joint (TMJ) internal derangement is a common disabling disorder that is often underestimated by society. The main goal of our study is to show the clinic improvement experienced by patients that underwent arthroscopic eminoplasty as a treatment for TMJ in our center. METHODS: 19 patients (1 male, 18 females) agreed to participate voluntarily in our study. These patients presented signs and symptoms of TMJ internal derangement and pathological MRI images, and underwent arthroscopic eminoplasty in our center...
June 9, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28597707/ct-guided-radiofrequency-ablation-of-spinal-osteoblastoma-treatment-and-long-term-follow-up
#17
Francesco Arrigoni, Antonio Barile, Luigi Zugaro, Eva Fascetti, Marcello Zappia, Luca Brunese, Carlo Masciocchi
OBJECTIVE: Osteoblastoma (OB) is a painful, rare, benign bone tumour usually observed in young populations, and this condition involves the spine in up to one-third of cases. We sought to focus on the minimally invasive treatment of spinal OB with radiofrequency ablation (RFA) under computed tomography (CT) guidance. When performed near the spinal cord, surgery can lead to instability of the spine, sometimes requiring additional interventions to stabilise the segments involved, and can cause the precocious onset of arthrosis or other degenerative diseases...
June 9, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28596990/magnetic-resonance-imaging-of-cerebral-malaria-patients-reveals-distinct-pathogenetic-processes-in-different-parts-of-the-brain
#18
Sanjib Mohanty, Laura A Benjamin, Megharay Majhi, Premanand Panda, Sam Kampondeni, Praveen K Sahu, Akshaya Mohanty, Kishore C Mahanta, Rajyabardhan Pattnaik, Rashmi R Mohanty, Sonia Joshi, Anita Mohanty, Ian W Turnbull, Arjen M Dondorp, Terrie E Taylor, Samuel C Wassmer
The mechanisms underlying the rapidly reversible brain swelling described in patients with cerebral malaria (CM) are unknown. Using a 1.5-Tesla (T) magnetic resonance imaging (MRI) scanner, we undertook an observational study in Rourkela, India, of 11 Indian patients hospitalized with CM and increased brain volume. Among the 11 cases, there were 5 adults and 6 children. All patients had reduced consciousness and various degrees of cortical swelling at baseline. The latter was predominately posterior in distribution...
May 2017: MSphere
https://www.readbyqxmd.com/read/28596576/knee-subchondral-bone-perfusion-and-its-relationship-to-marrow-fat-and-trabeculation-on-multi-parametric-mri-and-micro-ct-in-experimental-ckd
#19
Chao-Ying Wang, Yu-Juei Hsu, Yi-Jen Peng, Herng-Sheng Lee, Yue-Cune Chang, Chih-Shan Chang, Shih-Wei Chiang, Yi-Chih Hsu, Ming-Huang Lin, Guo-Shu Huang
The pathogenesis of chronic kidney disease (CKD) is multifactorial. In the progression of CKD arthropathy, arteriosclerosis may alter the knee subchondral bone marrow by altering blood flow through the bone vasculature. Herein, multi-parametric MRI assessment, including dynamic contrast enhanced magnetic resonance imaging (DCE-MRI), magnetic resonance spectroscopy (MRS), MRI T2*, contrast enhanced MR angiography (CE-MRA), and micro-CT were applied in a rodent nephrectomy model to: 1) investigate the blood perfusion of subchondral bone marrow and its relationship to fat water content and trabeculation pattern in CKD and 2) demonstrate the feasibility of using multi-parametric MRI parameters as imaging biomarkers to evaluate the disease's progression...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28594847/kidney-volume-to-gfr-ratio-predicts-functional-improvement-after-revascularization-in-atheromatous-renal-artery-stenosis
#20
Constantina Chrysochou, Darren Green, James Ritchie, David L Buckley, Philip A Kalra
BACKGROUND: Randomized controlled trials (RCT) have shown no overall benefit of renal revascularization in atherosclerotic renovascular disease (ARVD). However, 25% of patients demonstrate improvement in renal function. We used the ratio of magnetic resonance parenchymal volume (PV) to isotopic single kidney glomerular filtration rate (isoSKGFR) ratio as our method to prospectively identify "improvers" before revascularization. METHODS: Patients with renal artery stenosis who were due revascularization were recruited alongside non-ARVD hypertensive CKD controls...
2017: PloS One
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