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Carotid doppler

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https://www.readbyqxmd.com/read/28934833/hemodynamic-analysis-of-radiation-induced-damage-in-common-carotid-arteries-by-using-color-doppler-ultrasonography
#1
Alireza Mohammadkarim, Manijhe Mokhtari-Dizaji, Ali Kazemian, Hazhir Saberi
Purpose: The aim of this study was to assess vascular changes and blood flow abnormalities in the common carotid arteries of patients with head and neck cancers after external radiotherapy, using color Doppler ultrasonography. Methods: We studied 24 patients treated with external radiotherapy for various head and neck cancers. In order to study the acute effects of irradiation on common carotid blood flow and arterial diameter changes, color Doppler ultrasonography parameters such as peak systolic velocity, end diastolic velocity, mean velocity, systolic-to-diastolic velocity (S/D) ratio, pulsatility index (PI), resistive index (RI), and instantaneous diameter changes were evaluated before and after external radiotherapy...
April 14, 2017: Ultrasonography
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/28930095/robust-and-practical-non-invasive-estimation-of-local-arterial-wave-speed-and-mean-blood-velocity-waveforms
#3
Remi Kowalski, Richard Beare, Marie Willemet, Jordi Alastruey, Joseph J Smolich, Michael M H Cheung, Jonathan P Mynard
Local arterial wave speed, a surrogate of vessel stiffness, can be estimated via the pressure-velocity (PU) and diameter-velocity (ln(D)U) loop methods. These assume negligible early-systolic reflected waves (RWes) and require measurement of cross-sectionally averaged velocity (U<sub>mean</sub>), which itself is a valuable quantity related to volumetric blood flow. However, RWes may not always be negligible and routine Doppler ultrasound typically provides maximum velocity waveforms or estimates of mean velocity subject to various errors (U<sub>raw</sub>)...
September 20, 2017: Physiological Measurement
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/28914371/serum-cystatin-c-is-associated-with-kidney-function-but-not-with-cardiovascular-risk-factors-or-subclinical-atherosclerosis-in-patients-with-systemic-lupus-erythematosus
#7
Patricia Garcia-Garcia, Raquel Castejon, Pablo Tutor-Ureta, R A Silvestre, Susana Mellor-Pita, Carlos Jimenez-Ortiz, Miguel Yebra-Bango
Cystatin C (CysC) is a protein considered as an excellent marker of renal function, and it has been suggested as an independent predictor of cardiovascular (CV) risk. We evaluated the association of serum CysC with renal function, CV risk factors, inflammation, and subclinical atherosclerosis in Systemic Lupus Erythematosus (SLE) patients. Sixty-one SLE female patients were selected according to estimated glomerular filtration rate (GFR) > 60 ml/min/1.73m(2). Renal function parameters, SLE specific factors, CV risk factors, and inflammatory markers were assessed...
September 15, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28904456/association-of-serum-25-hydroxyvitamin-d-in-carotid-intima-media-thickness-a-study-from-south-india
#8
Jaydip Ray Chauduri, K Rukmini Mridula, Matapathi Umamashesh, Banda Balaraju, V C S Srinivasarao Bandaru
BACKGROUND: Abnormal carotid intima-media thickness (IMT) is a marker of carotid atherosclerosis which is a risk factor for cerebrovascular and cardiovascular diseases. Recent studies have found an association of 25-hydroxyvitamin D deficiency with abnormal carotid IMT. PURPOSE: The purpose of the study was to investigate the association of serum 25-hydroxyvitamin D levels with carotid IMT in Indian participants. MATERIALS AND METHODS: We prospectively recruited 300 participants at Yashoda Hospital, Hyderabad, during the study period between January 2012 and December 2014...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28900720/respiration-related-cerebral-blood-flow-variability-increases-during-control-mode-non-invasive-ventilation-in-normovolemia-and-hypovolemia
#9
Maria Skytioti, Signe Søvik, Maja Elstad
PURPOSE: Increased variability in cerebral blood flow (CBF) predisposes to adverse cerebrovascular events. Oscillations in arterial blood pressure and PaCO2 induce CBF variability. Less is known about how heart rate (HR) variability affects CBF. We experimentally reduced respiration-induced HR variability in healthy subjects, hypothesizing that CBF variability would increase. METHODS: Internal carotid artery (ICA) blood velocity was recorded by Doppler ultrasound in ten healthy subjects during baseline, control-mode, non-invasive mechanical ventilation (NIV), i...
September 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28899572/hypoglossal-nerve-palsy-in-the-course-of-dissection-of-the-internal-carotid-arteries-case-reports
#10
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/28888114/carotid-stiffness-extra-media-thickness-and-visceral-adiposity-in-young-adults
#11
Wesley K Lefferts, Susan D Sperry, Randall S Jorgensen, Ari G Kasprowicz, Michael R Skilton, Arturo Figueroa, Kevin S Heffernan
BACKGROUND AND AIMS: Carotid extra-media thickness (EMT) encompasses arterial adventitia and perivascular adipose tissue (PAT). Adventitial remodeling and PAT may contribute independently to functional (stiffness) and structural (remodeling) changes in artery wall properties. Visceral adiposity may contribute to PAT, thereby affecting artery stiffness. We investigated the relationships between carotid artery stiffness, EMT, and visceral adiposity in young, healthy individuals. METHODS: 135 healthy males (20 ± 2 yr, body mass index [BMI] 24...
September 1, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28883542/longitudinal-micro-ultrasound-assessment-of-the-ob-ob-mouse-model-evaluation-of-cardiovascular-renal-and-hepatic-parameters
#12
N Di Lascio, C Kusmic, F Stea, F Lenzarini, C Barsanti, A Leloup, F Faita
BACKGROUND/OBJECTIVES: Obesity is reaching epidemic proportions and is associated with increased risk factors for cardiovascular disease (CVD). Leptin-deficient mice (ob/ob) are widely employed to investigate obesity. Aim of this study was to provide a micro-ultrasound (μUS) longitudinal evaluation of the ob/ob mouse model in terms of cardiovascular effects, consequences for renal microcirculation and liver fat accumulation. SUBJECTS/METHODS: Sixteen wild-type (wt) and eleven ob/ob male mice were studied at 8 (T0) and 25 (T1) weeks of age with a μUS system (Vevo2100) and B-mode and Doppler images were acquired...
September 8, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28882392/fundus-autofluorescence-in-retinal-artery-occlusion-a-more-precise-diagnosis
#13
J-L Bacquet, M Sarov-Rivière, C Denier, G Querques, B Riou, L Bonin, E Barreau, M Labetoulle, A Rousseau
IMPORTANCE: Retinal artery occlusion (RAO) is a medical emergency associated with a high risk of cerebral vascular accident and other cardiovascular events. Among patients with non-arteritic RAO, a retinal embolus is observed in approximately 40% of cases. Fundus examination and retinography are not reliable to predict the nature of the emboli. OBSERVATIONS: We report three consecutive cases of central and branch RAO that were investigated with fundus autofluorescence, fluorescein angiography and color retinal photographs...
September 4, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28877355/sonographic-evaluation-of-complications-of-extracranial-carotid-artery-interventions
#14
John D Millet, Joseph J Cavallo, Leslie M Scoutt, Gowthaman Gunabushanam
Carotid endarterectomy and carotid artery stenting are among the most common peripheral vascular procedures performed worldwide. Sonography is the initial and often only imaging modality used in the evaluation of iatrogenic carotid arterial injuries. This pictorial essay provides an overview of the clinical and sonographic findings of complications after interventions in the extracranial carotid arteries, including dissection, fluid collections, pseudoaneurysm, thrombosis, thromboembolism, restenosis, and stent deformation...
September 6, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28874779/relation-between-characteristics-of-carotid-atherosclerotic-plaques-and-brain-white-matter-hyperintensities-in-asymptomatic-patients
#15
Enrico Ammirati, Francesco Moroni, Marco Magnoni, Maria A Rocca, Roberta Messina, Nicoletta Anzalone, Costantino De Filippis, Isabella Scotti, Francesca Besana, Pietro Spagnolo, Ornella E Rimoldi, Roberto Chiesa, Andrea Falini, Massimo Filippi, Paolo G Camici
White matter hyperintensities (WMH) can be incidentally found in patients with carotid atherosclerosis on brain magnetic resonance imaging (MRI). We investigated the relationship between WMH and characteristics of carotid plaques in asymptomatic patients without indication for carotid revascularization. We prospectively screened 235 consecutive patients with carotid stenosis <70%. After excluding patients with confounding causes of cerebral damage, 67 asymptomatic patients underwent carotid computed tomography angiography (CTA), contrast-enhanced ultrasound and brain MRI...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28871807/visualizing-carotid-bodies-with-doppler-ultrasound-versus-ct-angiography-preliminary-study
#16
Dominik Swieton, Mariusz Kaszubowski, Anna Szyndler, Marzena Chrostowska, Krzysztof Narkiewicz, Edyta Szurowska, Zoar Engelman, Maciej Piskunowicz
OBJECTIVE: The purpose of this article is to evaluate the utility of ultrasound in identifying carotid bodies (CBs) in patients with drug-resistant arterial hypertension. SUBJECTS AND METHODS: We enrolled 13 patients with drug-resistant hypertension into a trial for surgical CB excision. CT angiography (CTA) and Doppler ultrasound (DUS) of the cervical arteries were performed before surgery. CBs were identified in a blind manner at both CTA and DUS. CBs were defined at CTA as ovoid avidly enhancing structures at the inferomedial aspect of the carotid bifurcation...
September 5, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28862474/tympanic-membrane-temperature-decreases-during-head-up-tilt-relation-to-frontal-lobe-oxygenation-and-middle-cerebral-artery-mean-blood-flow-velocity
#17
David Lorr, Anton Lund, Mats Fredrikson, Niels H Secher
INTRODUCTION: Changes in blood flow influence temperature of surrounding tissues. Since the internal carotid artery (ICA) and internal jugular vein (IJV) neighbor the tympanic membrane, changes in their blood flow most likely determine changes in tympanic membrane temperature (TMT). We sought to evaluate the relationship between changes during a head-up tilt (HUT) induced reduction in cerebral blood flow (CBF) and TMT. METHODS: Ten male subjects (age 19-28 years) underwent 50° HUT until presyncope...
September 1, 2017: Scandinavian Journal of Clinical and Laboratory Investigation
https://www.readbyqxmd.com/read/28860105/ascertaining-the-value-of-noninvasive-measures-obtained-using-color-duplex-ultrasound-and-central-aortic-pressure-monitoring-during-the-management-of-cerebral-arteriovenous-malformation-resection-protocol-for-a-prospective-case-control-pilot-study
#18
Kathryn J Busch, Hosen Kiat
BACKGROUND: Dramatic hemodynamic changes occur upon removal of an arteriovenous malformation of the brain (bAVM) with a number of potentially serious perioperative complications, such as intracranial hemorrhage and venous occlusive hypertensive syndrome. As these complications largely occur in the postoperative inpatient period, a rapid, repeatable noninvasive investigation to serially monitor relevant intracranial hemodynamics may be of benefit. Though, transcranial Doppler (TCD) and transcranial color duplex (TCCD) are techniques used and available to provide hemodynamic measurements postoperatively, the time course of hemodynamic sequences following bAVM resection remains uncertain...
August 31, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28859681/factors-affecting-affect-cardiovascular-health-in-indonesian-hiv-patients-beginning-art
#19
Birry Karim, Ika Praseya Wijaya, Rizky Rahmaniyah, Ibnu Ariyanto, Shelley Waters, Riwanti Estiasari, Patricia Price
BACKGROUND: We present a small longitudinal study of how demographic factors and persistent burdens of HIV and cytomegalovirus (CMV) influence cardiovascular health in young adults beginning ART in an inner-city clinic in Jakarta, Indonesia. METHODS: ART-naïve HIV patients [n = 67; aged 31 (19 to 48) years] were enrolled in the JakCCANDO Project. Echocardiography and carotid Doppler ultrasonography were performed before ART (V0) and after 3, 6, and 12 months (V3-12)...
August 31, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/28853610/white-matter-hyperintensities-in-migraine-clinical-significance-and-central-pulsatile-hemodynamic-correlates
#20
Chun-Yu Cheng, Hao-Min Cheng, Shih-Pin Chen, Chih-Ping Chung, Yung-Yang Lin, Han-Hwa Hu, Chen-Huan Chen, Shuu-Jiun Wang
Background The role of central pulsatile hemodynamics in the pathogenesis of white matter hyperintensities in migraine patients has not been clarified. Methods Sixty patients with migraine (20-50 years old; women, 68%) without overt vascular risk factors and 30 demographically-matched healthy controls were recruited prospectively. Cerebral white matter hyperintensities volume was determined by T1-weighted magnetic resonance imaging with CUBE-fluid-attenuated-inversion-recovery sequences. Central systolic blood pressure, carotid-femoral pulse wave velocity, and carotid augmentation index were measured by applanation tonometry...
January 1, 2017: Cephalalgia: An International Journal of Headache
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