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23 records – page 1 of 3.

The accuracy of transcranial Doppler to detect vasospasm in patients with aneurysmal subarachnoid hemorrhage.

https://arctichealth.org/en/permalink/ahliterature185175
Source
Intensive Care Med. 2003 Jul;29(7):1088-94
Publication Type
Article
Date
Jul-2003
Author
L. Mascia
L. Fedorko
K. terBrugge
C. Filippini
M. Pizzio
V M Ranieri
M C Wallace
Author Affiliation
Dipartimento di Discipline Medico-Chirurgiche, Sezione di Anestesiologia e Rianimazione, Ospedale S. Giovanni Battista, Università di Torino, Corso Dogliotti 14, 10126, Torino, Italy. luciana.mascia@unito.it
Source
Intensive Care Med. 2003 Jul;29(7):1088-94
Date
Jul-2003
Language
English
Publication Type
Article
Keywords
Adult
Aged
Female
Humans
Male
Middle Aged
Ontario
Sensitivity and specificity
Subarachnoid Hemorrhage - complications
Ultrasonography, Doppler, Transcranial - standards
Vasospasm, Intracranial - complications - ultrasonography
Abstract
To examine the accuracy of transcranial Doppler to detect cerebral vasospasm in a patient population with aneurysmal subarachnoid hemorrhage.
Prospective blind comparison of transcranial Doppler with cerebral angiography. Diagnostic accuracy of transcranial Doppler was assessed using receiver operating characteristic (ROC) analysis and likelihood ratios. Sensitivity and specificity were calculated using directly measured middle cerebral artery diameter as reference standard.
Intensive Care Unit of a large university teaching hospital.
Twenty-two patients with subarachnoid hemorrhage were included. Patients underwent angiography on admission and after 8 days to diagnose vasospasm and were defined as having clinical vasospasm, angiographic vasospasm, or no vasospasm.
Sensitivity and specificity were 1.00 and 0.75 for angiographic vasospasm and both equal to 1.00 for clinical vasospasm diagnosis. A transcranial Doppler mean velocity threshold value of 100 cm/s for angiographic vasospasm and 160 cm/s for clinical vasospasm detection were chosen by ROC analysis.
A Transcranial Doppler mean velocity threshold of 160 cm/s, calculated by the ROC analysis, accurately detects clinical vasospasm. A daily transcranial Doppler examination performed by a trained operator should be routinely used to provide early identification of patients at high risk and to orient therapeutic decisions.
PubMed ID
12774157 View in PubMed
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[Assessment of arterio-venouse balance of human cerebral hemodynamics]

https://arctichealth.org/en/permalink/ahliterature83268
Source
Lik Sprava. 2005 Jun;(4):30-4
Publication Type
Article
Date
Jun-2005
Author
Volians'kyi O M
Source
Lik Sprava. 2005 Jun;(4):30-4
Date
Jun-2005
Language
Ukrainian
Publication Type
Article
Keywords
Adult
Brain - blood supply
Carotid Artery, Common - ultrasonography
Cerebrovascular Circulation - physiology
Humans
Jugular Veins - ultrasonography
Male
Middle Cerebral Artery - ultrasonography
Ultrasonography, Doppler, Transcranial
Abstract
22 healthy subjects aged from 25 to 45, mean age 32.7+/-5.3, have been observed. Every patient was subjected to diagnosing cerebral hemodynamics carried out every 7 days during 6 weeks. The circulation of common carotid artery, middle cerebral arteries and internal jugular arteries has been studied by means of LOGIQ-500MD (GE MS, USA) apparatus. The determination of arterio-venouse balance of cerebral hemodynamics was shown to be worthwhile for common carotid artery and its homolateral internal jugular artery. Arterio-venouse balance is presented as a ratio of circulation blood velocity in common carotid and internal jugular arteries.
PubMed ID
16158710 View in PubMed
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Assessment of cerebral autoregulation: the quandary of quantification.

https://arctichealth.org/en/permalink/ahliterature122399
Source
Am J Physiol Heart Circ Physiol. 2012 Sep 15;303(6):H658-71
Publication Type
Article
Date
Sep-15-2012
Author
Y C Tzeng
P N Ainslie
W H Cooke
K C Peebles
C K Willie
B A MacRae
J D Smirl
H M Horsman
C A Rickards
Author Affiliation
Cardiovascular Systems Laboratory, University of Otago, Wellington South, New Zealand. shieak.tzeng@otago.ac.nz
Source
Am J Physiol Heart Circ Physiol. 2012 Sep 15;303(6):H658-71
Date
Sep-15-2012
Language
English
Publication Type
Article
Keywords
Adult
Blood Flow Velocity
Blood pressure
British Columbia
Cerebrovascular Circulation
Exercise
Female
Fourier Analysis
Heart rate
Homeostasis
Humans
Hypercapnia - physiopathology
Hypocapnia - physiopathology
Linear Models
Male
Middle Cerebral Artery - physiopathology - ultrasonography
Models, Cardiovascular
New Zealand
Observer Variation
Prospective Studies
Regional Blood Flow
Reproducibility of Results
Respiration
Retrospective Studies
Supine Position
Texas
Tourniquets
Ultrasonography, Doppler, Pulsed
Ultrasonography, Doppler, Transcranial
Young Adult
Abstract
We assessed the convergent validity of commonly applied metrics of cerebral autoregulation (CA) to determine the extent to which the metrics can be used interchangeably. To examine between-subject relationships among low-frequency (LF; 0.07-0.2 Hz) and very-low-frequency (VLF; 0.02-0.07 Hz) transfer function coherence, phase, gain, and normalized gain, we performed retrospective transfer function analysis on spontaneous blood pressure and middle cerebral artery blood velocity recordings from 105 individuals. We characterized the relationships (n = 29) among spontaneous transfer function metrics and the rate of regulation index and autoregulatory index derived from bilateral thigh-cuff deflation tests. In addition, we analyzed data from subjects (n = 29) who underwent a repeated squat-to-stand protocol to determine the relationships between transfer function metrics during forced blood pressure fluctuations. Finally, data from subjects (n = 16) who underwent step changes in end-tidal P(CO2) (P(ET)(CO2) were analyzed to determine whether transfer function metrics could reliably track the modulation of CA within individuals. CA metrics were generally unrelated or showed only weak to moderate correlations. Changes in P(ET)(CO2) were positively related to coherence [LF: ß = 0.0065 arbitrary units (AU)/mmHg and VLF: ß = 0.011 AU/mmHg, both P
PubMed ID
22821992 View in PubMed
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Asymptomatic cervical artery stenoses in Moscow.

https://arctichealth.org/en/permalink/ahliterature212249
Source
Acta Neurol Scand. 1996 Apr;93(4):286-90
Publication Type
Article
Date
Apr-1996
Author
C. Harer
E I Gusev
Author Affiliation
Department of Neurology and Neurosurgery, Medical State University, Moscow, Russia.
Source
Acta Neurol Scand. 1996 Apr;93(4):286-90
Date
Apr-1996
Language
English
Publication Type
Article
Keywords
Adult
Aged
Aged, 80 and over
Carotid Stenosis - epidemiology - ultrasonography
Cross-Cultural Comparison
Cross-Sectional Studies
Female
Humans
Incidence
Male
Mass Screening
Middle Aged
Moscow - epidemiology
Risk factors
Ultrasonography, Doppler, Transcranial
Urban Population - statistics & numerical data
Vertebrobasilar Insufficiency - epidemiology - ultrasonography
Abstract
The risk of stroke related to asymptomatic carotid artery stenosis is known to be increased in high-grade or rapidly progressive stenosis. Information of the prevalence in the general population is required for the recommendation of screening methods to detect patients needing prophylactic treatment. We studied the prevalence and the grade of severity of extracranial carotid and vertebral artery obstructions by means of Doppler sonography in 529 asymptomatic Russians (m: 343, f: 186; 36-84 years, mean: 58.4 years) living in Moscow city. Internal carotid artery obstructions of more than 50% stenosis were present in 22 (= 4.2%) subjects, 8 of them (1.5%) had bilateral lesions. Appropriate abnormal findings in vertebral arteries were found in 11 (= 2.1%) subjects, in 1 of them bilaterally. Affection of both the carotid and the vertebral arteries was noted in 4(= 0.8%) individuals. There were no sexual differences. The risk factor which correlated most significantly with cervical arterial lesions was hypertension. Carotid lesions were also significantly associated with age and smoking, but not with diabetes or hyperlipoproteinemia. The prevalence of cervical artery stenoses was found to be lower than in western reports, which may be due to different technical equipment and different study design.
PubMed ID
8739440 View in PubMed
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[Characteristics of cerebral hemodynamics in children with chronic diseases of digestive tract organs]

https://arctichealth.org/en/permalink/ahliterature29701
Source
Lik Sprava. 2005 Jan-Feb;(1-2):55-7
Publication Type
Article
Author
V D Shkurenko
Source
Lik Sprava. 2005 Jan-Feb;(1-2):55-7
Language
Ukrainian
Publication Type
Article
Keywords
Adolescent
Case-Control Studies
Cerebral Cortex - blood supply - physiopathology
Cerebrovascular Circulation - physiology
Child
Digestive System Diseases - physiopathology
English Abstract
Humans
Ultrasonography, Doppler, Transcranial
Abstract
The article presents the results of Doppler examination of 44 healthy children and 180 children with chronic pathology of alimentary tract. All the patients underwent the reactivity test of the middle cerebral artery after graduated cool-water bearing. Dynamics of the studied data are presented in the article. The obtained results indicate more distinct changes of function of the vegetative nervous system in children with organic pathology of the alimentary canal.
PubMed ID
15915993 View in PubMed
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Comparison of the effectiveness and safety of a new de-airing technique with a standardized carbon dioxide insufflation technique in open left heart surgery: a randomized clinical trial.

https://arctichealth.org/en/permalink/ahliterature141038
Source
J Thorac Cardiovasc Surg. 2011 May;141(5):1128-33
Publication Type
Article
Date
May-2011
Author
Faleh Al-Rashidi
Maya Landenhed
Sten Blomquist
Peter Höglund
Per-Axel Karlsson
Leif Pierre
Bansi Koul
Author Affiliation
Department of Cardiothoracic Surgery, Skane University Hospital in Lund, University of Lund, Sweden.
Source
J Thorac Cardiovasc Surg. 2011 May;141(5):1128-33
Date
May-2011
Language
English
Publication Type
Article
Keywords
Aged
Aortic Valve - surgery
Blood Gas Analysis
Carbon Dioxide - economics
Cardiac Surgical Procedures
Cardiopulmonary Bypass
Cost-Benefit Analysis
Echocardiography, Transesophageal
Embolism, Air - blood - etiology - prevention & control - ultrasonography
Female
Hospital Costs
Humans
Insufflation - adverse effects - economics - methods
Male
Middle Aged
Monitoring, Intraoperative
Prospective Studies
Registries
Severity of Illness Index
Sweden
Time Factors
Treatment Outcome
Ultrasonography, Doppler, Transcranial
Abstract
We have compared the effectiveness, time required for de-airing, and safety of a newly developed de-airing technique for open left heart surgery (Lund technique) with a standardized carbon dioxide insufflation technique.
Twenty patients undergoing elective open aortic valve surgery were randomized prospectively to the Lund technique (Lund group, n = 10) or the carbon dioxide insufflation technique (carbon dioxide group, n = 10). Both groups were monitored intraoperatively during de-airing and for 10 minutes after weaning from cardiopulmonary bypass by transesophageal echocardiography and online transcranial Doppler for the severity and the number of gas emboli, respectively. The systemic arterial partial pressure of carbon dioxide and pH were also monitored in both groups before, during, and after cardiopulmonary bypass.
The severity of gas emboli observed on transesophageal echocardiography and the number of microembolic signals recorded by transcranial Doppler were significantly lower in the Lund group during the de-airing procedure (P = .00634) and in the first 10 minutes after weaning from cardiopulmonary bypass (P = .000377). Furthermore, the de-airing time was significantly shorter in the Lund group (9 vs 15 minutes, P = .001). The arterial pH during the cooling phase of cardiopulmonary bypass was significantly lower in the carbon dioxide group (P = .00351), corresponding to significantly higher arterial partial pressure of carbon dioxide (P = .005196) despite significantly higher gas flows (P = .0398) in the oxygenator throughout the entire period of cardiopulmonary bypass.
The Lund de-airing technique is safer, simpler, and more effective compared with the carbon dioxide insufflation technique. The technique is also more cost-effective because the de-airing time is shorter and no extra expenses are incurred.
Notes
Comment In: J Thorac Cardiovasc Surg. 2011 Nov;142(5):1285; author reply 1285-622014347
PubMed ID
20817209 View in PubMed
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[Comparisons of cerebral circulation parameters in schoolchildren living in the Far East and European North].

https://arctichealth.org/en/permalink/ahliterature127470
Source
Ross Fiziol Zh Im I M Sechenova. 2011 Oct;97(10):1113-33
Publication Type
Article
Date
Oct-2011
Author
V P Rozhkov
I V Nikolaev
S I Soroko
Source
Ross Fiziol Zh Im I M Sechenova. 2011 Oct;97(10):1113-33
Date
Oct-2011
Language
Russian
Publication Type
Article
Keywords
Adaptation, Physiological
Adolescent
Blood Flow Velocity - physiology
Brain - blood supply
Cerebrovascular Circulation - physiology
Child
Cold Climate
Electric Impedance
Female
Hemodynamics
Humans
Male
Russia
Ultrasonography, Doppler, Transcranial - methods
Abstract
Transcranial Doppler sonography and impedansometry was used to study cerebral circulation in students aged from 7 to 17 living in the North in the "absolute discomfort" area (Magadan region. 62 degrees North, 158 degrees East, n = 167) and "discomfort" area (Arkhangelsk region, 61 degrees North, 41 degrees East, n = 52). New data were obtained about both blood flow parameters in main cerebral arteries, vessels tone and vasomotor reactivity as well as differences between these indices in children from the two northern areas. The results reveal that arterial blood flow velocity (BFV) in cerebral arteries is faster in Koryaks and Evens who are the children of the native population compared to BFV in the children born in the North whose parents represent newcomers. A tendency exists in the form of vascular tone rising in the living in the North students. This tendency is more expressed in children and adolescents from Magadan region which is distinguished from Arkhangelsk region by more severe climate. The indices that characterize individual alterations of cerebral circulation under hypoxic-cold factors as well as population peculiarities related to "polar adaptive type of metabolism" forming are discussed.
PubMed ID
22292277 View in PubMed
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Derivation of transcranial Doppler criteria for angiographically proven middle cerebral artery vasospasm after aneurysmal subarachnoid hemorrhage.

https://arctichealth.org/en/permalink/ahliterature118852
Source
J Neuroimaging. 2013 Oct;23(4):489-94
Publication Type
Article
Date
Oct-2013
Author
Joseph Sebastian
Carol Derksen
Khurshid Khan
Mohammad Ibrahim
Bilal Hameed
Muzaffar Siddiqui
Michael Chow
J Max Findlay
Ashfaq Shuaib
Maher Saqqur
Author Affiliation
Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
Source
J Neuroimaging. 2013 Oct;23(4):489-94
Date
Oct-2013
Language
English
Publication Type
Article
Keywords
Adult
Alberta - epidemiology
Causality
Cerebral Angiography - statistics & numerical data
Comorbidity
Feasibility Studies
Female
Humans
Infarction, Middle Cerebral Artery - diagnosis - epidemiology
Male
Middle Aged
Prognosis
Reproducibility of Results
Risk factors
Sensitivity and specificity
Subarachnoid Hemorrhage - diagnosis - epidemiology
Ultrasonography, Doppler, Transcranial - statistics & numerical data
Vasospasm, Intracranial - diagnosis - epidemiology
Abstract
Transcranial Doppler (TCD) has been subjected to criticism for detecting vasospasm (VSP). Our study's aim is to derive criteria for middle cerebral artery (MCA) vasospasm (MCA-VSP) based on cerebral angiography (CA).
A prospective data of patients with aneurysmal subarachnoid hemorrhage (aSAH) from January 2004 to August 2009. TCD was performed daily from day 2 to 14 from symptom's onset. Follow-up CA was done at day 7-9. TCD mean flow velocities (MFV) of all vessels at baseline (b), middle (m) and before CA (preangio) were recorded. Several MCA MFV ratios were computed. Moderate to severe VSP on CA was defined as >1/3 luminal narrowing. Univariate and stepwise logistic regression analysis were performed.
One hundred sixty-nine patients (338 MCA) with aSAH were included, mean age: 54.8 ? 13, women: 103 (62%). Twenty-nine patients (8.6%) had angiographic MCA-VSP. TCD scoring system of 3 points for MCA-VSP was computed based on (a) bMCA MFV = 120 cm/s (sensitivity: 59.3%, specificity: 85%, PPV: 36.4%, NPV: 93.5%, P
PubMed ID
23163812 View in PubMed
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[Effect of riodipin on the central and cerebral haemodynamics, cell membrane permeability in patients with hypertensive disease]

https://arctichealth.org/en/permalink/ahliterature86617
Source
Lik Sprava. 2007 Jul-Sep;(5-6):55-60
Publication Type
Article
Author
Arutiunova K Sh
Source
Lik Sprava. 2007 Jul-Sep;(5-6):55-60
Language
Ukrainian
Publication Type
Article
Keywords
Administration, Cutaneous
Administration, Oral
Adult
Aged
Antihypertensive Agents - administration & dosage - therapeutic use
Blood Pressure - drug effects
Cell Membrane Permeability - drug effects
Cerebrovascular Circulation - drug effects
Coronary Circulation - drug effects
Echocardiography
Humans
Hypertension - drug therapy - physiopathology - ultrasonography
Middle Aged
Nifedipine - administration & dosage - analogs & derivatives - therapeutic use
Treatment Outcome
Ultrasonography, Doppler, Transcranial
Abstract
The author studied features of indices of the central, cerebral haemodynamics and penetrability of cellular membranes in patients with hypertensive disease during the treatment of the disease through oral and transdermal formulation of riodipin. It was established that efficiency of the treatment increases when transdermal formulation of riodipin was used.
PubMed ID
18418924 View in PubMed
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Functional assessment of high-grade ICA stenosis with duplex ultrasound and transcranial Doppler.

https://arctichealth.org/en/permalink/ahliterature125383
Source
Clin Physiol Funct Imaging. 2012 May;32(3):241-6
Publication Type
Article
Date
May-2012
Author
Helene Zachrisson
Marita Fouladiun
Christian Blomstrand
Jan Holm
Reinhard Volkmann
Author Affiliation
Clinical Physiology, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden. helene.zachrisson@lio.se
Source
Clin Physiol Funct Imaging. 2012 May;32(3):241-6
Date
May-2012
Language
English
Publication Type
Article
Keywords
Adult
Aged
Aged, 80 and over
Blood Flow Velocity
Carotid Artery, Internal - physiopathology - ultrasonography
Carotid Stenosis - physiopathology - ultrasonography
Cerebrovascular Circulation
Circle of Willis - physiopathology - ultrasonography
Collateral Circulation
Female
Hemodynamics
Humans
Magnetic Resonance Angiography
Male
Middle Aged
Predictive value of tests
Prognosis
Regional Blood Flow
Retrospective Studies
Severity of Illness Index
Sweden
Ultrasonography, Doppler, Duplex
Ultrasonography, Doppler, Transcranial
Abstract
Duplex ultrasound (DUS) has shown a >90% accuracy compared to angiography, concerning the degree of internal carotid artery (ICA) stenosis. However, uncertainty may occur in a severe stenosis, in which peak systolic velocity (PSV) may decrease owing to high flow resistance or high backward pressure. We investigated intracranial collateral flows using transcranial Doppler (TCD) to further evaluate the hemodynamic significance of high-grade ICA stenosis.
In this retrospective study, 320 consecutive symptomatic patients were examined. The degree of ICA stenosis and collateral capacity in the circle of Willis was investigated by DUS and TCD. In addition, magnetic resonance angiography (MRA) was added in a subgroup of 204 patients. The criterion for hemodynamic significant ICA stenosis was established collateral flow.
In 91% of all symptomatic vessels (291 vessels), an ICA stenosis of =70% was found. Established collateral flow always indicated precerebral carotid artery disease of =70%. Furthermore, in 11% of the whole study material, collateral reserve capacity was found despite high-grade (=70%) ICA stenosis. PSV in ICA
Notes
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PubMed ID
22487160 View in PubMed
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23 records – page 1 of 3.