keyword
MENU ▼
Read by QxMD icon Read
search

cerebral blood flow velocity

keyword
https://www.readbyqxmd.com/read/29130477/transcranial-doppler-and-lower-extremity-function-in-older-adults-einstein-aging-study
#1
Ali Ezzati, Tatjana Rundek, Joe Verghese, Carol A Derby
OBJECTIVES: To determine whether transcranial Doppler ultrasound (TCD) measures of mean blood flow velocity (MBFV) in the major cerebral arteries are associated with measures of lower extremity function in community-dwelling older adults. DESIGN: Cross-sectional study. SETTING: Community sample. PARTICIPANTS: Individuals aged 70 and older (mean 79.5, 54% female) without dementia participating in the Einstein Aging Study (N = 200)...
November 11, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/29111029/hematoma-volume-is-a-predictive-factor-of-disturbed-autoregulation-after-spontaneous-intracerebral-hemorrhage
#2
Hongyin Ma, Zhen-Ni Guo, Xin Sun, Jia Liu, Shan Lv, Lu Zhao, Weitong Guo, Hang Jin, Yi Yang
BACKGROUND: Dynamic cerebral autoregulation (dCA) is probably disturbed after spontaneous intracerebral hemorrhage (ICH) and could be an independent predictor of clinical outcome. Clinical determinants of dCA status after ICH need to be further elucidated. METHODS: We finally enrolled 53 patients diagnosed with supratentorial ICH within 6days from onset. DCA was assessed 4-6days after ICH onset by monitoring middle cerebral artery blood flow velocities and simultaneous arterial blood pressure continuously, utilizing transcranial Doppler combined with a servo-controlled finger plethysmograph...
November 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29103148/cerebrovascular-co2-reactivity-during-isoflurane-nitrous-oxide-anesthesia-in-patients-with-chronic-renal-failure
#3
Kazuyoshi Ishida, Masato Uchida, Kohji Utada, Atsuo Yamashita, Satoshi Yamashita, Shiro Fukuda, Mishiya Matsumoto, Takefumi Sakabe
PURPOSE: We assessed the cerebrovascular CO2 reactivity (CO2R) in chronic renal failure (CRF) patients without diabetes mellitus (DM), uncontrolled hypertension, peripheral vascular disease, or neurological disease under isoflurane-nitrous oxide anesthesia. METHODS: Forty-nine patients undergoing surgery, including 36 CRF patients (30 receiving dialysis and six pre-dialysis patients) and 13 patients without CRF (controls). Middle cerebral artery flow velocity (VMCA) was measured by transcranial Doppler ultrasonography at an end-tidal CO2 of 35 to 45 mmHg...
November 4, 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/29095241/effects-of-cerebral-blood-flow-and-vessel-conditions-on-speech-recognition-in-patients-with-postlingual-adult-cochlear-implant-predictable-factors-for-the-efficacy-of-cochlear-implant
#4
Takashi Ishino, Mahmoud Ali Ragaee, Tatsuya Maruhashi, Masato Kajikawa, Yukihito Higashi, Toru Sonoyama, Sachio Takeno, Katsuhiro Hirakawa
OBJECTIVES: Cochlear implantation (CI) has been the most successful procedure for restoring hearing in a patient with severe and profound hearing loss. However, possibly owing to the variable brain functions of each patient, its performance and the associated patient satisfaction are widely variable. The authors hypothesize that peripheral and cerebral circulation can be assessed by noninvasive and globally available methods, yielding superior presurgical predictive factors of the performance of CI in adult patients with postlingual hearing loss who are scheduled to undergo CI...
October 31, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/29091052/transcranial-doppler-of-the-middle-cerebral-artery-indicates-regional-gray-matter-cerebral-perfusion
#5
Evan P Pasha, Takashi Tarumi, Andreana P Haley, Hirofumi Tanaka
INTRODUCTION: We determined if transcranial color-coded Doppler derived hemodynamics are associated with MRI based cerebral blood flow (CBF) in regions clinically important to dementia in healthy middle-aged adults. METHODS: In thirty subjects (18m/12f; age=52±1 years), blood flow velocity (BFV) and cerebrovascular conductance (CVC) were measured with transcranial color-coded Doppler (TCCD) at the middle cerebral artery (MCA) and cerebral blood flow (CBF) was assessed with arterial spin labeled perfusion MRI...
November 1, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29089345/loss-of-female-sex-hormones-exacerbates-cerebrovascular-and-cognitive-dysfunction-in-aortic-banded-miniswine-through-a-neuropeptide-y-ca-2-activated-potassium-channel-nitric-oxide-mediated-mechanism
#6
T Dylan Olver, Jessica A Hiemstra, Jenna C Edwards, Todd R Schachtman, Cheryl M Heesch, Paul J Fadel, M Harold Laughlin, Craig A Emter
BACKGROUND: Postmenopausal women represent the largest cohort of patients with heart failure with preserved ejection fraction, and vascular dementia represents the most common form of dementia in patients with heart failure with preserved ejection fraction. Therefore, we tested the hypotheses that the combination of cardiac pressure overload (aortic banding [AB]) and the loss of female sex hormones (ovariectomy [OVX]) impairs cerebrovascular control and spatial memory. METHODS AND RESULTS: Female Yucatan miniswine were separated into 4 groups (n=7 per group): (1) control, (2) AB, (3) OVX, and (4) AB-OVX...
October 31, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29075198/impacts-of-simulated-weightlessness-by-dry-immersion-on-optic-nerve-sheath-diameter-and-cerebral-autoregulation
#7
Marc Kermorgant, Florian Leca, Nathalie Nasr, Marc-Antoine Custaud, Thomas Geeraerts, Marek Czosnyka, Dina N Arvanitis, Jean-Michel Senard, Anne Pavy-Le Traon
Dry immersion (DI) is used to simulate weightlessness. We investigated in healthy volunteers if DI induces changes in ONSD, as a surrogate marker of intracranial pressure (ICP) and how these changes could affect cerebral autoregulation (CA). Changes in ICP were indirectly measured by changes in optic nerve sheath diameter (ONSD). 12 healthy male volunteers underwent 3 days of DI. ONSD was indirectly assessed by ocular ultrasonography. Cerebral blood flow velocity (CBFV) of the middle cerebral artery was gauged using transcranial Doppler ultrasonography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29060774/regression-based-noninvasive-estimation-of-intracranial-pressure
#8
Andrea Fanelli, Frederick W Vonberg, Rohan Jaishankar, Syed M Imaduddin, Robert C Tasker, Thomas Heldt
Monitoring of intracranial pressure (ICP) is indicated in patients with a variety of conditions affecting the brain and cerebrospinal fluid space. The measurement of ICP, however, is highly invasive as it requires placement of a catheter in the brain tissue or cerebral ventricular spaces. Several noninvasive techniques have been proposed to overcome this issue, and one class of approaches is based on analyzing cerebral blood flow velocity (CBFV) and arterial blood pressure (ABP) waveforms to infer ICP. Here, we analyze a physiologic model linking ICP to CBFV and ABP and present a regression-based approach to estimating ICP...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060173/relationship-between-heart-rate-excursion-and-apnea-duration-in-patients-with-obstructive-sleep-apnea
#9
Jordi Sola-Soler, Beatriz F Giraldo, Jose Antonio Fiz, Raimon Jane
Obstructive Sleep Apnea (OSA) is a sleep disorder with a high prevalence in the general population. It is a risk factor for many cardiovascular diseases, and an independent risk factor for cerebrovascular diseases such as stroke. After an apnea episode, both arterial blood pressure and cerebral blood flow velocity change in function of the apnea duration (AD). We hypothesized that the relative excursion in heart rate (AHR), defined as the percentage difference between the maximum and the minimum heart rate values associated to an obstructive apnea event, is also related to AD...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29058985/seven-years-follow-up-of-comparative-study-between-stenting-and-medication-for-treatment-of-symptomatic-vertebrobasilar-artery-stenosis
#10
Jun Wang, Changyang Zhong, Yan Zhang, Yingnan Wei, Huili Liu, Chunli Wu, Yongxing Yan
Objective Endovascular stent-assistant angioplasty (ESAA) is a valid treatment for symptomatic vertebrobasilar artery stenosis (SVAS), but the long-term effect and the improvement of condition compared with medication treatment are unknown. This study investigated the long-term efficacy of ESAA in patients with moderate and severe SVAS, and compared the efficacy with medication treatment. Materials and methods We conducted a retrospective analysis of clinical data of 43 patients with moderate and severe SVAS hospitalized in our department...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29057262/relationship-between-interferon-beta-1a-administration-and-intracranial-vascular-tone-regulation-in-patients-with-relapsing-remitting-multiple-sclerosis-a-pilot-study
#11
Vincenzo Dattola, Lilla Bonanno, Antonino Naro, Antonino Chillura, Anna Lisa Logiudice, Edoardo Sessa, Fausto Famà, Angelo Quartarone, Rocco Salvatore Calabrò, Silvia Marino, Margherita Russo
Interferon beta (IFN-β) therapy is one of the most commonly prescribed immunomodulatory therapies in relapsing-remitting multiple sclerosis (RRMS). A reversible cerebral vasoconstriction syndrome (RCVS), associated with IFN-β use, has been recently described. For this reason, we tested the effect of once a week intramuscular administration of IFN-β-1A on the function of cerebral vessels in a cohort of RRMS patients. Using transcranial Doppler (TCD) ultrasound, we measured the mean blood flow velocity (MFV) in intracranial vessels 10 h after IFN-β administration...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29044294/serum-levels-of-anti-pon1-and-anti-hdl-antibodies-as-potential-biomarkers-of-premature-atherosclerosis-in-systemic-lupus-erythematosus
#12
Patricia López, Javier Rodríguez-Carrio, Aleida Martínez-Zapico, Ángel I Pérez-Álvarez, Raquel López-Mejías, Lorena Benavente, Lourdes Mozo Mozo, Luis Caminal-Montero, Miguel A González-Gay, Ana Suárez
The present study aimed to evaluate the possible role of immunoglobulin G (IgG) antibodies against high-density lipoproteins (HDL) and paraoxonase 1 (PON1) as possible biomarkers of cardiovascular disease (CVD) in systemic lupus erythematosus (SLE). To this end, levels of these autoantibodies, PON1 activity and total antioxidant capacity were quantified in serum samples from 198 SLE patients, 100 healthy controls (HC) and 42 non-autoimmune individuals with traditional cardiovascular risk factors. PON1 rs662 polymorphism was analysed in a subgroup of patients and controls...
October 10, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29043544/icp-versus-laser-doppler-cerebrovascular-reactivity-indices-to-assess-brain-autoregulatory-capacity
#13
F A Zeiler, J Donnelly, D Cardim, D K Menon, P Smielewski, M Czosnyka
BACKGROUND: To explore the relationship between various autoregulatory indices in order to determine which approximate small vessel/microvascular (MV) autoregulatory capacity most accurately. METHODS: Utilizing a retrospective cohort of traumatic brain injury patients (N = 41) with: transcranial Doppler (TCD), intracranial pressure (ICP) and cortical laser Doppler flowmetry (LDF), we calculated various continuous indices of autoregulation and cerebrovascular responsiveness: A...
October 17, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29042040/optimal-blood-pressure-during-cardiopulmonary-bypass-defined-by-cerebral-autoregulation-monitoring
#14
Daijiro Hori, Yohei Nomura, Masahiro Ono, Brijen Joshi, Kaushik Mandal, Duke Cameron, Masha Kocherginsky, Charles W Hogue
OBJECTIVES: We sought to define the lower and upper limits of cerebral blood flow autoregulation and the optimal blood pressure during cardiopulmonary bypass. We further sought to identify variables predictive of these autoregulation end points. METHODS: Cerebral autoregulation was monitored continuously with transcranial Doppler in 614 patients during cardiopulmonary bypass enrolled in 3 investigations. A moving Pearson's correlation coefficient was calculated between cerebral blood flow velocity and mean arterial pressure to generate the variable mean velocity index...
November 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29041920/intraoperative-continuous-cerebral-microcirculation-measurement-in-patients-with-aneurysmal-subarachnoid-hemorrhage-preliminary-data-on-the-early-administration-of-magnesium-sulfate
#15
Bjoern Sommer, Cornelia S Weidinger, Dennis Wolf, Michael Buchfelder, Hubert Schmitt
BACKGROUND: In patients with subarachnoid hemorrhage (SAH), vasospasm remains one of the major complications. The application of intravenous magnesium sulfate (MgSO4) has been under discussion to prevent cerebral ischemia. Our aim was to examine the impact of early MgSO4 administration on local cerebral microcirculation during microsurgical clipping of SAH-related aneurysms. METHODS: The non-invasive laser-Doppler spectrophotometry system "Oxygen-to-See (O2C)" was used in 14 consecutive patients (11 female, 3 male, median age 56...
October 17, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/29034765/assessment-of-maternal-cerebral-blood-flow-velocity-by-transcranial-doppler-ultrasound-before-delivery-and-in-the-early-postpartum-period
#16
Hale Z Batur Caglayan, Bijen Nazliel, Mehmet Cinar, Esra Ataoglu, Ozlem Moraloglu, Ceyla Irkec
OBJECTIVE: This prospective observational study aimed to identify the effects of labor on cerebral hemodynamics by measuring the middle cerebral artery (MCA) blood flow velocity by transcranial Doppler ultrasound (TCD), and the related factors just before delivery and within the 24 h after delivery. METHODS: The study included 35 healthy pregnant women with a gestational age of >37 weeks who were in labor and a control group including healthy, age-matched, nonpregnant women (n = 24)...
October 16, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29028933/novel-method-for-intraoperative-assessment-of-cerebral-autoregulation-by-paced-breathing
#17
N H Sperna Weiland, J Hermanides, M W Hollmann, B Preckel, W J Stok, J J van Lieshout, R V Immink
Background: Cerebral autoregulation (CA) is the mechanism that maintains constancy of cerebral blood flow (CBF) despite variations in blood pressure (BP). Patients with attenuated CA have been shown to have an increased incidence of peri-operative stroke. Studies of CA in anaesthetized subjects are rare, because a simple and non-invasive method to quantify the integrity of CA is not available. In this study, we set out to improve non-invasive quantification of CA during surgery. For this purpose, we introduce a novel method to amplify spontaneous BP fluctuations during surgery by imposing mechanical positive pressure ventilation at three different frequencies and quantify CA from the resulting BP oscillations...
October 6, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29025748/compromised-cerebrovascular-regulation-and-cerebral-oxygenation-in-pulmonary-arterial-hypertension
#18
Simon Malenfant, Patrice Brassard, Myriam Paquette, Olivier Le Blanc, Audrey Chouinard, Valérie Nadeau, Philip D Allan, Yu-Chieh Tzeng, Sébastien Simard, Sébastien Bonnet, Steeve Provencher
BACKGROUND: Functional cerebrovascular regulatory mechanisms are important for maintaining constant cerebral blood flow and oxygen supply in heathy individuals and are altered in heart failure. We aim to examine whether pulmonary arterial hypertension (PAH) is associated with abnormal cerebrovascular regulation and lower cerebral oxygenation and their physiological and clinical consequences. METHODS AND RESULTS: Resting mean flow velocity in the middle cerebral artery mean flow velocity in the middle cerebral artery (MCAvmean); transcranial Doppler), cerebral pressure-flow relationship (assessed at rest and during squat-stand maneuvers; analyzed using transfer function analysis), cerebrovascular reactivity to CO2, and central chemoreflex were assessed in 11 patients with PAH and 11 matched healthy controls...
October 12, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29019899/effect-of-cerebral-oxygen-saturation-on-postoperative-nausea-and-vomiting-in-female-laparoscopic-surgery-patients
#19
RANDOMIZED CONTROLLED TRIAL
WenJun Guo, Jie Ding, XiaoJu Jin, GaoJie Li
BACKGROUND: The purpose of this study was to investigate effect of cerebral oxygen saturation (SCTO2) on postoperative nausea and vomiting (PONV) in female patients who underwent laparoscopic surgery. METHODS: This study included 90 female patients who underwent laparoscopic surgery (60 cases of gynecological operations and 30 cases of gallbladder operations). All patients were allocated into 3 groups of 30 patients each: group A (gynecological laparoscopic surgery), group B (gynecological laparoscopic surgery with mannitol treatment) and group C (laparoscopic cholecystectomy surgery)...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29017899/a-brain-computer-interface-based-on-functional-transcranial-doppler-ultrasound-using-wavelet-transform-and-support-vector-machines
#20
Aya Khalaf, Matthew Sybeldon, Ervin Sejdic, Murat Akcakaya
BACKGROUND: Functional transcranial Doppler (fTCD) is an ultrasound based neuroimaging technique used to assess neural activation that occurs during a cognitive task through measuring velocity of cerebral blood flow. NEW METHOD: The objective of this paper is to investigate the feasibility of a 2-class and 3-class real-time BCI based on blood flow velocity in left and right middle cerebral arteries in response to mental rotation and word generation tasks. Statistical features based on a five-level wavelet decomposition were extracted from the fTCD signals...
October 7, 2017: Journal of Neuroscience Methods
keyword
keyword
79756
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"