keyword
MENU ▼
Read by QxMD icon Read
search

Doppler transcranial

keyword
https://www.readbyqxmd.com/read/28939189/cerebral-blood-flow-velocity-positively-correlates-with-brain-volumes-in-long-term-remitted-depression
#1
Thomas Desmidt, Frédéric Andersson, Bruno Brizard, Jean-Philippe Cottier, Frédéric Patat, Valérie Gissot, Catherine Belzung, Wissam El-Hage, Vincent Camus
BACKGROUND: Mechanisms involved in brain changes observed in major depression have been poorly investigated in clinical populations. Changes in cerebral blood flow (CBF) have been found in depressed patients and constitute a potential mechanism by which brain volume varies in depression. We have tested the association of cerebral blood flow velocity (CBFV) as assessed with Transcranial Doppler (TCD) and cerebral blood flow (CBF) as assessed with Arterial Spin Labeling Magnetic Resonance Imaging (ASL-MRI) with Total Brain Volume (TBV) and the volume of seven subcortical regions, in currently depressed and long-term remitted patients...
September 19, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28931297/-intracranial-pressure-evaluation-by-ophthalmologist
#2
J Čmelo, R Illéš, J Šteňo
The value of ICT is important in diagnosis of the diseases of the eye and orbit Methods for direct measurement of intracranial pressure (ICT) are exact, but they are invasive and there is some risk of infection and damage of the tissue. Currently there are 2 valid indirect methods of mesurement of IKT. Digital Ophthalmodynamometry (D-ODM) and Transcranial Doppler ultrasonography (TDU). D-ODM is a non-invasive method for measuring of the Pulsating Venous Pressure (VPT). We can measure VPT by the pulse phenomena...
2017: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/28928674/the-gly-16-allele-of-the-g16r-single-nucleotide-polymorphism-in-the-%C3%AE-2-adrenergic-receptor-gene-augments-the-glycemic-response-to-adrenaline-in-humans
#3
Kim Z Rokamp, Jonatan M Staalsø, Morten Zaar, Peter Rasmussen, Lonnie G Petersen, Rikke V Nielsen, Niels H Secher, Niels V Olsen, Henning B Nielsen
Cerebral non-oxidative carbohydrate consumption may be driven by a β2-adrenergic mechanism. This study tested whether the 46G > A (G16R) single nucleotide polymorphism of the β2-adrenergic receptor gene (ADRB2) influences the metabolic and cerebrovascular responses to administration of adrenaline. Forty healthy Caucasian men were included from a group of genotyped individuals. Cardio- and cerebrovascular variables at baseline and during a 60-min adrenaline infusion (0.06 μg kg(-1) min(-1)) were measured by Model flow, near-infrared spectroscopy and transcranial Doppler sonography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28925529/cerebrovascular-response-to-the-cold-pressor-test-the-critical-role-of-carbon-dioxide
#4
Michael M Tymko, Thijs P Kerstens, Kevin W Wildfong, Philip N Ainslie
In addition to increasing sympathetic nervous activity, blood pressure, and cerebral blood flow (CBF), the cold pressor test (CPT) stimulates pain receptors, which may increase ventilation above metabolic demand; this response likely reduces the partial pressure of end-tidal carbon dioxide (PET CO2 ), and will attenuate elevations in CBF. We hypothesized: (1) CPT would elicit hyperventilation, effectively lowering PET CO2 ; (2) the CBF response will be elevated during an isocapnic (controlled PET CO2 ), compared to a poikilocapnic CPT (uncontrolled PET CO2 ); (3) In response to CPT, the common carotid artery (CCA) will vasodilatate, while the internal carotid artery (ICA) will remain unchanged to help regulate CBF...
September 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28919267/post-carotid-endarterectomy-hypertension-part-2-association-with-peri-operative-clinical-anaesthetic-and-transcranial-doppler-derived-parameters
#5
Jeremy E Newman, Mathew J Bown, Robert D Sayers, Jonathan P Thompson, Thompson G Robinson, Bryan Williams, Ronney Panerai, Peter Lacy, A Ross Naylor
OBJECTIVE/BACKGROUND: The first paper in this series observed that pre-operative baroreceptor dysfunction and poorly controlled hypertension were independently predictive for identifying patients who went on to require treatment for post-endarterectomy hypertension (PEH). The second paper examines the influence of intra-operative patient, transcranial Doppler (TCD) ultrasound, and anaesthetic variables on the incidence of PEH. METHODS: In total, 106 patients underwent carotid endarterectomy (CEA) under general anaesthesia...
September 14, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28915826/acupuncture-lowering-blood-pressure-for-secondary-prevention-of-stroke-a-study-protocol-for-a-multicenter-randomized-controlled-trial
#6
Yu-Zheng Du, Xin-Xin Gao, Cheng-Ting Wang, Hai-Zhen Zheng, Yun Lei, Meng-Han Wu, Xue-Min Shi, Hai-Peng Ban, Wen-Long Gu, Xiang-Gang Meng, Mao-Ti Wei, Chun-Xiao Hu
BACKGROUND: Stroke is the prime cause of morbidity and mortality in the general population, and hypertension will increase the recurrence and mortality of stroke. We report a protocol of a pragmatic randomized controlled trial (RCT) using blood pressure (BP)-lowering acupuncture add-on treatment to treat patients with hypertension and stroke. METHODS: This is a large-scale, multicenter, subject-, assessor- and analyst-blinded, pragmatic RCT. A total of 480 patients with hypertension and ischemic stroke will be randomly assigned to two groups: an experimental group and a control group...
September 15, 2017: Trials
https://www.readbyqxmd.com/read/28912128/aging-modifies-the-effect-of-cardiac-output-on-middle-cerebral-artery-blood-flow-velocity
#7
Anne-Sophie G T Bronzwaer, Jasper Verbree, Wim J Stok, Mat J A P Daemen, Mark A van Buchem, Matthias J P van Osch, Johannes J van Lieshout
An association between cerebral blood flow (CBF) and cardiac output (CO) has been established in young healthy subjects. As of yet it is unclear how this association evolves over the life span. To that purpose, we continuously recorded mean arterial pressure (MAP; finger plethysmography), CO (pulse contour; CO-trek), mean blood flow velocity in the middle cerebral artery (MCAV; transcranial Doppler ultrasonography), and end-tidal CO2 partial pressure (PetCO2) in healthy young (19-27 years), middle-aged (51-61 years), and elderly subjects (70-79 years)...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28904458/can-transcranial-color-doppler-spectral-signatures-be-a-novel-biomarker-for-monitoring-cerebrovascular-autoregulation-and-intracranial-pressure-a-speculative-synthesis
#8
Sandhya Mangalore, Kotresh, Rakshith Srinivasa, Alangar Sathyaranjandas Hegde, Rangashetty Srinivasa
BACKGROUND: Trans Cranial Colour Doppler (TCCD) has been extensively used in various neurological and neurosurgical conditions causing severe raise in the intracranial pressure (ICP). MATERIAL AND METHOD: Our study explores the sequential evolution of TCCD flow pattern by correlating with pupillary reactivity, Glasgow coma scale (GCS), and imaging. Our cohort consisted of thirty patients with ten patients in each subgroup admitted to the neuro-Intensive Care Unit (NICU) for various neurological and neurosurgical causes...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28899572/hypoglossal-nerve-palsy-in-the-course-of-dissection-of-the-internal-carotid-arteries-case-reports
#9
Magdalena Torbus-Paluszczak, Sebastian Mucha, Maciej Wawrzyńczyk, Krystyna Pierzchała, Wojciech Bartman, Monika Adamczyk-Sowa
Internal carotid artery dissection (ICAD) has become an increasingly recognized cause of cerebrovascular accidents in young and middle-aged patients. We report 2 cases of hypoglossal nerve palsy in the course of dissection of the internal carotid arteries. The first patient was admitted to the Department of Neurology due to swallowing difficulty, speech articulation disorders and numbness of the right half of the tongue for 4 weeks. Extracranial vessel ultrasound (US) and transcranial colour Doppler (TCD) visualized thrombus causing occlusion of the right internal carotid artery (RICA)...
August 30, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28894559/pattern-of-cerebral-blood-flow-velocity-using-transcranial-doppler-ultrasonography-in-children-with-sickle-cell-disorder-in-lagos-state-nigeria
#10
Motunrayo Oluwabukola Adekunle, Adeola Barakat Animasahun, Ijeoma Nnenna Diaku-Akinwumi, Olisamedua Fidelis Njokanma
Cerebrovascular accident (CVA) is a common, devastating neurological complication of sickle cell disorder (SCD) with a high recurrent and mortality rate. The Stroke Prevention Trial in Sickle Cell Anaemia study (STOP) recommends routine screening with transcranial Doppler ultrasonography in children aged two to sixteen years with SCD. The present study assessed cerebral blood flow velocities of children with SCD in accordance with the recommendation of routine screening by the STOP study. METHODS: Transcranial Doppler ultrasonography was done for children with SCD that attended Sickle Cell Foundation, Nigeria between July and November 2015...
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/28891839/the-relative-effects-of-dexmedetomidine-and-propofol-on-cerebral-blood-flow-velocity-and-regional-brain-oxygenation-a-randomised-noninferiority-trial
#11
Ehab Farag, Michael Kot, Attila Podolyak, Maged Argalious, Milind Deogaonkar, Edward J Mascha, Zekun Xu, Irene Katzan, Zeyd Ebrahim
BACKGROUND: Dexmedetomidine constricts cerebral blood vessels without a concomitant reduction in cerebral metabolic oxygen consumption. Its safety as a sedative in patients with neurological diseases thus remains uncertain. OBJECTIVE: Our primary objective was to test the hypothesis that dexmedetomidine is noninferior to propofol as regards cerebral blood flow (CBF) velocity and brain oxygenation. DESIGN: Unblinded randomised trial. SETTING: Cleveland Clinic Hospital, Cleveland, from November 2010 to July 2013...
June 19, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28887332/the-cerebro-cardiovascular-response-to-periodic-squat-stand-maneuvers-in-healthy-subjects-a-time-domain-analysis
#12
Sam C Barnes, Naomi Ball, Victoria Joanna Haunton, Thompson G Robinson, Ronney B Panerai
BACKGROUND: Squat-stand maneuvers (SSMs) have been used to improve the coherence of transfer function analysis (TFA) estimates during the assessment of dynamic cerebral autoregulation (dCA). There is a need to understand the influence of peripheral changes resulting from SSMs on cerebral blood flow, which might confound estimates of dCA. METHODS: 29 healthy subjects underwent recordings at rest (5 min standing) and 15 SSMs (0.05Hz). Heart rate (3-lead ECG), end-tidal CO2 (capnography), blood pressure (Finometer), cerebral blood velocity (CBV, transcranial Doppler, MCA) and the angle of the thigh (tilt sensor) were measured continuously...
September 8, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28886841/identification-and-quantification-of-patent-foramen-ovale-mediated-shunts-echocardiography-and-transcranial-doppler
#13
REVIEW
Ahmed N Mahmoud, Islam Y Elgendy, Nayan Agarwal, Jonathan M Tobis, Mohammad Khalid Mojadidi
Once deemed benign, patent foramen ovale (PFO)-mediated right-to-left shunting has now been linked to stroke, migraine, and hypoxemia. Contrast transesophageal echocardiography is considered the standard technique for identifying a PFO, allowing visualization of the atrial septal anatomy and differentiation from non-PFO right-to-left shunts. Transthoracic echocardiography is the most common method for PFO imaging, being cost-effective, but has the lowest sensitivity. Transcranial Doppler is highly sensitive but is unable to differentiate cardiac from pulmonary shunts; it is the best method to quantitate shunt severity, being more sensitive than transthoracic or transesophageal echocardiography so is our preferred screening method for PFO...
October 2017: Interventional cardiology clinics
https://www.readbyqxmd.com/read/28880397/transcranial-doppler-a-stethoscope-for-the-brain-neurocritical-care-use
#14
REVIEW
Chiara Robba, Danilo Cardim, Mypinder Sekhon, Karol Budohoski, Marek Czosnyka
Transcranial Doppler (TCD) ultrasonography is a noninvasive bedside monitoring technique that can evaluate cerebral blood flow hemodynamics in the intracranial arterial vasculature. TCD allows assessment of linear cerebral blood flow velocity, with a high temporal resolution and is inexpensive, reproducible, and portable. The aim of this review is to provide an overview of the most commonly used TCD derived signals and measurements used commonly in neurocritical care. We describe both basic (flow velocity, pulsatility index) and advanced concepts, including critical closing pressure, wall tension, autoregulation, noninvasive intracranial pressure, brain compliance, and cerebrovascular time constant; we also describe the clinical applications of TCD to highlight their utility in the diagnosis and monitoring of cerebrovascular diseases as the "stethoscope for the brain...
September 7, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28877097/application-of-transcranial-color-doppler-ultrasonography-for-assessing-middle-cerebral-arteries-in-rheumatoid-arthritis
#15
Qiuyue Chen, Shilin Li, Guorong Lv, Yanchun Zhao
To assess the role of ultrasonography for assessing middle cerebral arteries (MCAs) in rheumatoid arthritis (RA). Middle cerebral arteries of 32 RA patients and 32 healthy volunteers were examined by ultrasonography. Peak systolic blood flow velocity (PSV), end-diastolic velocity, and resistance index (RI) of MCA were measured using Doppler ultrasound. Results were expressed as mean ± SD. No significant difference in peak systolic velocity was obtained between RA patients (52.44 ± 19.56 cm/s) and healthy volunteers (51...
September 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28872356/vitamin-b6-prevents-isocarbophos-induced-vascular-dementia-in-rats-through-n-methyl-d-aspartate-receptor-signaling
#16
Peng Li, Mo-Li Zhu, Guo-Pin Pan, Jun-Xiu Lu, Fan-Rong Zhao, Xu Jian, Li-Ying Liu, Guang-Rui Wan, Yuan Chen, Song Ping, Shuang-Xi Wang, Chang-Ping Hu
BACKGROUND: We have previously reported that the long-term exposure of organophosphorus induces vascular dementia (VD) in rats. As a coenzyme, vitamin B6 is mainly involved in the regulation of metabolisms. Whether vitamin B6 improves VD remains unknown. METHODS: The model of VD was induced by feeding rats with isocarbophos (0.5 mg/kg per two day, 12 weeks). The blood flow of the posterior cerebral artery (PCA) in rat was assessed by transcranial Doppler (TCD)...
September 5, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28869425/effects-of-low-oxygen-dead-space-ventilation-and-breath-holding-test-in-evaluating-cerebrovascular-reactivity-a-comparative-observation
#17
Ke-Ju Ju, Ling-Ling Zhong, Xiao-Yu Ni, Lei Xia, Liu-Jun Xue, Guan-Liang Cheng
OBJECTIVE: This study aims to explore the application prospect of low oxygen dead space ventilation (LODSV) in evaluating vasomotor reactivity (VMR) by comparison between LODSV and breath-holding test (BHT). METHODS: Outpatient or inpatient patients who underwent transcranial Doppler sonography (TCD) were enrolled into this study. These patients successively underwent BHT and LODSV. The cooperation degree, tolerance conditions and adverse reactions in patients were recorded, and VMR was calculated, compared and analyzed...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28868047/in-premature-newborns-intraventricular-hemorrhage-causes-cerebral-vasospasm-and-associated-neurodisability-via-heme-induced-inflammasome-mediated-interleukin-1-production-and-nitric-oxide-depletion
#18
Michael Eisenhut, Samyami Choudhury
BACKGROUND: Intraventricular hemorrhage (IVH) occurs in 60-70% of neonates weighing 500-750 g and 10-20% of those weighing 1,000-1,500 g. All forms of IVH have been associated with neurocognitive deficits. Both subarachnoid and IVHs have been associated with delayed vasospasm leading to neurological deficits. Pathways linking hemoglobin release from blood clots to vasospasm include heme-induced activation of inflammasomes releasing interleukin-1 (IL-1) that can cause calcium dependent and independent vasospasm...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28864674/neurologic-complications-of-sickle-cell-disease-in-africa-a-systematic-review-and-meta-analysis
#19
REVIEW
Jean Jacques Noubiap, Michel K Mengnjo, Nicolas Nicastro, Joseph Kamtchum-Tatuene
OBJECTIVE: To summarize prevalence data on the neurologic complications of sickle cell disease (SCD) in Africa. METHODS: We searched EMBASE, PubMed, and African Index Medicus to identify all relevant articles published from inception to May 31, 2016. Each study was reviewed for methodologic quality. A random-effects model was used to estimate the prevalence of neurologic complications of SCD across studies. RESULTS: Thirty-one studies were included...
September 1, 2017: Neurology
https://www.readbyqxmd.com/read/28864135/reliability-of-right-to-left-shunt-screening-in-the-prevention-of-scuba-diving-related-decompression-sickness
#20
Emmanuel Gempp, Marianne Lyard, Pierre Louge
OBJECTIVES: The aim of this study was to investigate the relationship between right-to-left shunt (RLS) and the clinical features of decompression sickness (DCS) in scuba divers and to determine the potential benefit for screening this anatomical predisposition in primary prevention. METHODS: 634 injured divers treated in a single referral hyperbaric facility for different types of DCS were retrospectively compared to 259 healthy divers. All subjects had a RLS screening by contrast Transcranial Doppler (TCD) ultrasound according to a standardized method...
December 1, 2017: International Journal of Cardiology
keyword
keyword
85284
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"