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https://www.readbyqxmd.com/read/29767351/evaluating-the-methods-used-for-measuring-cerebral-blood-flow-at-rest-and-during-exercise-in-humans
#1
REVIEW
Michael M Tymko, Philip N Ainslie, Kurt J Smith
The first accounts of measuring cerebral blood flow (CBF) in humans were made by Angelo Mosso in ~1880, who recorded brain pulsations in patients with skull defects. In 1890, Charles Roy and Charles Sherrington determined in animals that brain pulsations-assessed via a similar method used by Mosso-were altered during a variety of stimuli including sensory nerve stimulation, asphyxia, and pharmacological interventions. Between 1880 and 1944, measurements for CBF were typically relied on skull abnormalities in humans...
May 16, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29755714/identification-of-cerebral-artery-stenosis-using-bilateral-photoplethysmography
#2
Hyun Goo Kang, Seogki Lee, Han Uk Ryu, Youngsuk Shin
Cerebral artery stenosis is currently diagnosed by transcranial Doppler (TCD), computed tomographic angiography (CTA), or magnetic resonance angiography (MRA). CTA exposes a patient to radiation, while CTA and MRA are invasive and side effects were related to contrast medium use. This study aims to provide a technique that can simply discriminate between people with normal blood vessels and those with cerebral artery stenosis using photoplethysmography (PPG), which is noninvasive and inexpensive. Moreover, the measurement takes only 120 seconds and is conducted on the fingers...
2018: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29741889/an-environmentally-responsive-reciprocal-replicating-network
#3
Craig C Robertson, Harold W Mackenzie, Tamara Kosikova, Douglas Philp
A reciprocal replication system is constructed from four building blocks, A, B, C, and D, which react in a pairwise manner through either a 1,3-dipolar cycloaddition or the condensation reaction between an amine and an aldehyde to create two templates, trans-TAB and TCD. These templates are equipped with complementary recognition sites-two carboxylic acids (trans-TAB) or two 4,6-dimethylamidopyridines (TCD)-that enable each template to direct the formation of its complementary partner through two mutually-reinforcing crosscatalytic pathways, in which the templates trans-TAB or TCD preorganize the appropriate building blocks within two catalytically-active ternary complexes: [C•D•trans TAB] and [A•B•TCD]...
May 9, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29738579/baicd-gene-cluster-abundance-is-negatively-correlated-with-clostridium-difficile-infection
#4
Philipp Solbach, Patrick Chhatwal, Sabrina Woltemate, Evelina Tacconelli, Michael Buhl, Markus Gerhard, Christoph K Thoeringer, Maria J G T Vehreschild, Nathalie Jazmati, Jan Rupp, Michael P Manns, Oliver Bachmann, Sebastian Suerbaum
BACKGROUND: Clostridium difficile infection (CDI) is a major cause of hospital-acquired diarrhea. Secondary bile acids were shown to confer resistance to colonization by C. difficile. 7α-dehydroxylation is a key step in transformation of primary to secondary bile acids and required genes have been located in a single bile acid-inducible (bai) operon in C. scindens as well as in C. hiranonis, two Clostridium sp. recently reported to protect against C. difficile colonization. AIM: To analyze baiCD gene abundance in C...
2018: PloS One
https://www.readbyqxmd.com/read/29693565/rupture-predictions-of-notched-ti-6al-4v-using-local-approaches
#5
Mirco Peron, Jan Torgersen, Filippo Berto
Ti-6Al-4V has been extensively used in structural applications in various engineering fields, from naval to automotive and from aerospace to biomedical. Structural applications are characterized by geometrical discontinuities such as notches, which are widely known to harmfully affect their tensile strength. In recent years, many attempts have been done to define solid criteria with which to reliably predict the tensile strength of materials. Among these criteria, two local approaches are worth mentioning due to the accuracy of their predictions, i...
April 25, 2018: Materials
https://www.readbyqxmd.com/read/29693475/transcranial-doppler-ultrasonography-cerebral-blood-flow-dynamics-study-of-neurosurgical-patients-in-peri-agonal-period-with-fixed-dilated-or-non-reacting-pupils
#6
Pratyush Shrestha, Safiur Rahman Ansari, Ram Kumar Ghimire, Dinesh Nath Gongal, Upendra Psd Devkota
INTRODUCTION: Fixed dilated and unreactive pupils are a harbinger of imminent death in neurosurgical patients, signifying that the brainstem is not functioning. Transcranial Doppler (TCD) ultrasonography is a noninvasive, bedside method of determining the flow velocities in the basal cerebral arteries, used extensively in various neurosurgical conditions. AIMS AND OBJECTIVES: To study the cerebral blood flow dynamics of neurosurgical patients in peri-agonal period with fixed dilated or non reacting pupils using TCD...
April 25, 2018: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/29687859/clinical-diagnosis-of-cerebral-vasospasm-after-subarachnoid-hemorrhage-by-using-transcranial-doppler-sonography
#7
D-D Li, J-Y Chang, C-X Zhou, J-B Cui
OBJECTIVE: To investigate the diagnosis of cerebral vasospasm (CVS) after subarachnoid hemorrhage (SAH) by transcranial Doppler (TCD) sonography. PATIENTS AND METHODS: 90 patients with SAH admitted to the Department of Neurosurgery of Weifang People's Hospital from January 2016 to December 2016 were selected. TCD and digital subtraction angiography (DSA) were used to diagnose the prevalence of CVS in patients. The severity of disease was evaluated (improved-Fisher grading)...
April 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29684543/molecular-characterization-of-clostridium-difficile-isolated-from-carriage-and-association-of-its-pathogenicity-to-prevalent-toxic-genes
#8
Abdulwahab Ali Abuderman, Ayesha Mateen, Rabbani Syed, Mustafa Sawsan Aloahd
BACKGROUND: There are reports of non-toxigenic C. difficile strains from asymptomatic carriers are increasing source of transmission. Asymptomatic carriage transmission in the hospital or community settings might have changed over the years. Therefore, we initiated a prospective epidemiological study to define the risk factors and pathogenicity of asymptomatic C. difficile carriage. METHODS: Stools sample from 188 subjects with diarrhoea due to C. difficile toxin and colonization without diarrhoea was subjected to routine microbial culture, molecular characterization for identification of toxin genes and mechanisms of resistance in C...
April 20, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29679650/cmv-seronegative-donors-effect-on-clinical-severity-of-cmv-infection-and-reconstitution-of-cmv-specific-immunity
#9
P L J van der Heiden, H M van Egmond, S A J Veld, M van de Meent, M Eefting, L C de Wreede, C J M Halkes, J H F Falkenburg, W A F Marijt, I Jedema
BACKGROUND: Cytomegalovirus (CMV)-specific T-cells are crucial to prevent CMV disease. CMV seropositive recipients transplanted with stem cells from a CMV seronegative allogeneic donor (R+ D- ) may be at risk for CMV disease due to absence of donor CMV-specific memory T-cells in the graft. METHODS: We analyzed the duration of CMV reactivations and the incidence of CMV disease in R+ D- and R+ D+ patients after alemtuzumab-based T-cell depleted allogeneic stem cell transplantation (TCD alloSCT)...
April 18, 2018: Transplant Immunology
https://www.readbyqxmd.com/read/29677060/cerebral-small-vessel-but-not-large-vessel-disease-is-associated-with-impaired-cerebral-autoregulation-during-cardiopulmonary-bypass-a-retrospective-cohort-study
#10
Yohei Nomura, Roland Faegle, Daijiro Hori, Abbas Al-Qamari, Alexander J Nemeth, Rebecca Gottesman, Gayane Yenokyan, Charles Brown, Charles W Hogue
BACKGROUND: Impaired cerebral blood flow (CBF) autoregulation during cardiopulmonary bypass (CPB) is associated with stroke and other adverse outcomes. Large and small arterial stenosis is prevalent in patients undergoing cardiac surgery. We hypothesize that large and/or small vessel cerebral arterial disease is associated with impaired cerebral autoregulation during CPB. METHODS: A retrospective cohort analysis of data from 346 patients undergoing cardiac surgery with CPB enrolled in an ongoing prospectively randomized clinical trial of autoregulation monitoring were evaluated...
April 17, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29674994/a-cross-sectional-study-on-cerebral-hemodynamics-after-mild-traumatic-brain-injury-in-a-pediatric-population
#11
Corey M Thibeault, Samuel Thorpe, Michael J O'Brien, Nicolas Canac, Mina Ranjbaran, Ilyas Patanam, Artin Sarraf, James LeVangie, Fabien Scalzo, Seth J Wilk, Ramon Diaz-Arrastia, Robert B Hamilton
The microvasculature is prominently affected by traumatic brain injury (TBI), including mild TBI (concussion). Assessment of cerebral hemodynamics shows promise as biomarkers of TBI, and may help inform development of therapies aimed at promoting neurologic recovery. The objective of this study was to assess the evolution in cerebral hemodynamics observable with transcranial Doppler (TCD) ultrasound in subjects suffering from a concussion at different intervals during recovery. Pediatric subjects between the ages of 14 and 19 years clinically diagnosed with a concussion were observed at different points post-injury...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29672277/early-flow-disturbances-of-tunnelled-haemodialysis-catheters-and-topographic-landmarks-in-chest-x-ray
#12
Jeanette Fahnert, Patrick Stumpp, Thomas Kahn, Frieder Keller, Stephan Schiekofer, Sirak Petros, Jan Halbritter, Tom H Lindner, Franz Maximilian Rasche
BACKGROUND/AIMS: The position of the tip of tunnelled haemodialysis (HD) catheters (THC) might influence flow characteristics during HD. In chest X-ray (CXR), carina-related landmarks may be practicable to verify the THC position, and tip-carina distance (TCD) might be useful to predict early-flow dysfunctions. METHODS: In this single-centre, retrospective study, the TCD and the angle between the distal catheter and the body vertical axis (tip-body vertical-angle [TVA]) was measured in 115 THC by post-procedure CXR with 2 investigators...
2018: Blood Purification
https://www.readbyqxmd.com/read/29662244/refined-graft-versus-host-disease-relapse-free-survival-in-transplant-from-hla-identical-related-or-unrelated-donors-in-acute-myeloid-leukemia
#13
Giorgia Battipaglia, Annalisa Ruggeri, Myriam Labopin, Liisa Volin, Didier Blaise, Gerard Socié, Reza Tabrizi, Jan J Cornelissen, Ardeshir Ghavamzadeh, Anne Huynh, Depei Wu, Ibrahim Yakoub-Agha, Johan Maertens, Patrice Chevallier, Mohamad Mohty, Arnon Nagler
Refined graft-versus-host disease (GVHD)/relapse-free survival (GRFS) considers main outcomes of allogeneic stem cell transplant (HSCT), estimating long-term survival without significant morbidity as a surrogate of HSCT success. We compared GRFS in 5059 adults with acute myeloid leukemia (AML), undergoing HSCT in first complete remission from 2000 to 2015 either from a matched sibling (MSD, n = 3731) or unrelated donor (MUD, n = 1328). Median age was 49 (range: 18-76) years. Median follow-up was 32 and 60 months in MSD and MUD, respectively (p < 0...
April 16, 2018: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/29649509/cybersickness-related-changes-in-brain-hemodynamics-a-pilot-study-comparing-transcranial-doppler-and-near-infrared-spectroscopy-assessments-during-a-virtual-ride-on-a-roller-coaster
#14
Alireza Mazloumi Gavgani, Rachel H X Wong, Peter R C Howe, Deborah M Hodgson, Frederick R Walker, Eugene Nalivaiko
Our aim was to assess cerebral blood flow changes during cybersickness. Transcranial Doppler (TCD) ultrasound and near infrared spectroscopy (NIRS) were used separately in two independent experiments. In both studies, a 15-min virtual roller coaster ride was used as a provocative visual stimulus. Subjective nausea ratings were obtained at 1 min intervals. The TCD study was performed in 14 healthy subjects (8 males and 6 females); in this study we also measured heart rate and arterial pressure. In a separate study a 52-channel NIRS device (Hitachi ETG-4000) was used to monitor activated brain regions by measuring oxy-hemoglobin (HbO2) concentration in 9 healthy subjects (4 male, 5 females)...
April 9, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29644151/trans-cranial-doppler-as-an-ancillary-study-supporting-irreversible-brain-injury-in-a-post-cardiac-arrest-patient-on-extracorporeal-membrane-oxygenation
#15
Naresh Mullaguri, Aarti Sarwal, Nakul Katyal, Premkumar Nattanamai, Pravin George, Christopher R Newey
Obtaining neuroimaging in patients on cardiopulmonary support devices such as extracorporeal membrane oxygenation (ECMO) can be challenging, given the complexities in monitoring, instrumentation, and associated hemodynamic lability. Transcranial Doppler (TCD) is used as an ancillary test for the assessment of cerebral circulatory arrest, but its use in non-pulsatile blood flow in venoarterial (VA) ECMO is not well described. We report the use of TCD in a patient on VA ECMO post-cardiac arrest for evaluation of death by neurological criteria...
February 6, 2018: Curēus
https://www.readbyqxmd.com/read/29628651/a-comparative-evaluation-of-effect-of-modern-curing-lights-and-curing-modes-on-conventional-and-novel-resin-monomers
#16
Konda Karthik Roy, Kanumuru Pavan Kumar, Gijo John, Sujatha Gopal Sooraparaju, Surya Kumari Nujella, Kyatham Sowmya
Aim: The aim of this study is to compare and to evaluate effect of curing light and curing modes on the nanohybrid composite resins with conventional Bis-GMA and novel tricyclodecane (TCD) monomers. Methodology: Two nanohybrid composites, IPS empress direct and charisma diamond were used in this study. Light-emitting diode (LED)-curing unit and quartz-tungsten-halogen (QTH)-curing unit which were operated into two different modes: continuous and soft start. Based on the composite resin, curing lights, and mode of curing used, the samples were divided into 8 groups...
January 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29595639/an-overlooked-cause-in-a-patient-with-recurrent-ischemic-stroke-a-case-report
#17
Xunzhe Yang, Mingsheng Liu, Yicheng Zhu, Xiaobo Zhang, Shan Gao, Jun Ni
RATIONALE: The majority of ischemic strokes are due to cardioembolism, large vessel atherothromboembolism, small vessel occlusive disease, or other unusual mechanisms. In most clinical settings, many strokes without a well-defined etiology requires a thorough diagnostic evaluation, otherwise the underlying cause might be easily overlooked. Here we report on the rare cause of a patient with recurrent stroke. PATIENT CONCERNS: A 50-year-old female patient had a 4-year history of recurrent acute onset of neurological deficits...
March 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29593597/comprehension-of-generalized-conversational-implicatures-by-children-with-and-without-autism-spectrum-disorder
#18
Gemma Pastor-Cerezuela, Juan C Tordera Yllescas, Francisco González-Sala, Maite Montagut-Asunción, María-Inmaculada Fernández-Andrés
This study evaluates the comprehension of generalized conversational implicatures (GCI) in children with and without autism spectrum disorder (ASD), using a GCI test constructed based on the Levinson model, which distinguishes between three types of implicatures: type Q (or scalar: "what is not referred to does not occur"); type I ("by default, it is not necessary to say what can be assumed"); and type M ("if someone is expressing something in a not very simple or marked way, it is because s/he is describing a situation that is not very typical, frequent, or prototypical")...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29587896/development-and-assessment-of-an-improved-recombinant-multiepitope-antigen-based-immunoassay-to-diagnose-chronic-chagas-disease
#19
Luz María Peverengo, Valeria Garcia, Luz María Rodeles, Diego Mendicino, Miguel Vicco, Claudia Lagier, Verónica Gonzalez, Luis Gugliotta, Iván Marcipar
The use of chimeric molecules fusing several antigenic determinants is a promising strategy for the development of low-cost, standardized and reliable kits to determine specific antibodies. In this study, we designed and assessed a novel recombinant chimera that complements the performance of our previously developed chimera, CP1 [FRA and SAPA antigens (Ags)], to diagnose chronic Chagas disease. The new chimeric protein, named CP3, is composed of MAP, TcD and TSSAII/V/VI antigenic determinants. We compared the performance of both chimeric Ags using a panel of 67 Trypanosoma cruzi-reactive sera and 67 non-reactive ones...
March 28, 2018: Parasitology
https://www.readbyqxmd.com/read/29579816/systodiastolic-separation-expresses-cerebral-circulatory-arrest
#20
A Cacciatori, M Godino, R Mizraji
There is a situation before the cerebral circulatory cessation phase, the systodiastolic separation in transcranial Doppler (TCD), which may raise doubts to the operator technician who performs it. A total of 266 studies were performed in 188 neurocritical patients over a 9-year period: 88 cases (77%) corresponded to cerebral circulatory arrest (CCA) which accompanies brain death (BD); 9 (5%) presented the systodiastolic separation pattern. In 1 of those 9 there was persistence of cough reflex and spontaneous breathing; in 5, CCA was not reached; only 3 evolved to CCA...
March 2018: Transplantation Proceedings
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