scholarly journals Orbital Doppler Evaluation of Blood Flow Velocities in Optic Neuritis

2012 ◽  
Vol 26 (2) ◽  
pp. 116 ◽  
Author(s):  
Mehdi Karami ◽  
Mohsen Janghorbani ◽  
Alireza Dehghani ◽  
Maryam Riahinejad
Keyword(s):  
Blood Flow ◽  
Optic Neuritis ◽  
Blood Flow Velocities ◽  
Doppler Evaluation ◽  
Flow Velocities

scholarly journals Orbital Doppler Evaluation of Blood Flow Velocities in Patients with Diabetic Retinopathy

2012 ◽  
Vol 9 (2-3) ◽  
pp. 104-111 ◽  
Author(s):  
Mehdi Karami ◽  
Mohsen Janghorbani ◽  
Alireza Dehghani ◽  
Karim Khaksar ◽  
Ahmad Kaviani
Keyword(s):  
Blood Flow ◽  
Diabetic Retinopathy ◽  
Blood Flow Velocities ◽  
Doppler Evaluation ◽  
Flow Velocities

Patterns of Cerebral Blood Flow and Systemic Hemodynamics During Arithmetic Processing

2008 ◽  
Vol 22 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Natalie Werner ◽  
Neval Kapan ◽  
Gustavo A. Reyes del Paso
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Time Course ◽  
Doppler Sonography ◽  
Transcranial Doppler Sonography ◽  
Systemic Hemodynamics ◽  
Heart Period ◽  
Blood Flow Velocities ◽  
Flow Velocities

The present study explored modulations in cerebral blood flow and systemic hemodynamics during the execution of a mental calculation task in 41 healthy subjects. Time course and lateralization of blood flow velocities in the medial cerebral arteries of both hemispheres were assessed using functional transcranial Doppler sonography. Indices of systemic hemodynamics were obtained using continuous blood pressure recordings. Doppler sonography revealed a biphasic left dominant rise in cerebral blood flow velocities during task execution. Systemic blood pressure increased, whereas heart period, heart period variability, and baroreflex sensitivity declined. Blood pressure and heart period proved predictive of the magnitude of the cerebral blood flow response, particularly of its initial component. Various physiological mechanisms may be assumed to be involved in cardiovascular adjustment to cognitive demands. While specific contributions of the sympathetic and parasympathetic systems may account for the observed pattern of systemic hemodynamics, flow metabolism coupling, fast neurogenic vasodilation, and cerebral autoregulation may be involved in mediating cerebral blood flow modulations. Furthermore, during conditions of high cardiovascular reactivity, systemic hemodynamic changes exert a marked influence on cerebral blood perfusion.

scholarly journals Effect of positioning from supine and left lateral positions to left lateral tilt on maternal blood flow velocities and waveforms in full-term parturients

Anaesthesia ◽  
2012 ◽  
Vol 67 (8) ◽  
pp. 936-936 ◽  
Author(s):  
P. Kundra ◽  
J. Velraj ◽  
U. Amirthalingam ◽  
S. Habeebullah ◽  
K. Yuvaraj ◽  
...  
Keyword(s):  
Blood Flow ◽  
Maternal Blood ◽  
Full Term ◽  
Lateral Tilt ◽  
Blood Flow Velocities ◽  
Flow Velocities

Blood Flow Velocities in the Vertebral Veins of Healthy Subjects: A Duplex Sonographic Study

1999 ◽  
Vol 9 (4) ◽  
pp. 198-200 ◽  
Author(s):  
Olaf Hoffmann ◽  
Markus Weih ◽  
Thomas von Münster ◽  
Stephan Schreiber ◽  
Karl Max Einhäupl ◽  
...  
Keyword(s):  
Blood Flow ◽  
Healthy Subjects ◽  
Blood Flow Velocities ◽  
Flow Velocities

scholarly journals Acute Effect of Hypervolemic Hemodilution on Retrobulbar Hemodynamics in Anterior Ischemic Optic Neuropathy

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Marion Bienert ◽  
Niklas Plange ◽  
Andreas Remky ◽  
Kay Oliver Arend ◽  
David Kuerten
Keyword(s):  
Blood Flow ◽  
Hydroxyethyl Starch ◽  
Optic Neuropathy ◽  
Acute Effect ◽  
Anterior Ischemic Optic Neuropathy ◽  
Ischemic Optic Neuropathy ◽  
Hypervolemic Hemodilution ◽  
Blood Flow Velocities ◽  
Retrobulbar Hemodynamics ◽  
Flow Velocities

Purpose.Ischemic ocular disorders may be treated by hypervolemic hemodilution. The presumed therapeutic benefit is based on a volume effect and improved rheological factors. The aim was to investigate the acute effect of intravenous hydroxyethyl starch on retrobulbar hemodynamics in patients with nonarteritic anterior ischemic optic neuropathy (NAION).Methods.24 patients with acute NAION were included. Retrobulbar hemodynamics were measured using color Doppler imaging before and 15 min after intravenous infusion of 250 cc 10% hydroxyethyl starch (HES). Peak systolic velocity (PSV), end diastolic velocity (EDV), and Pourcelot’s resistive index (RI) were measured in the ophthalmic artery (OA), central retinal artery (CRA), and short posterior ciliary arteries (PCAs).Results.After infusion of HES blood flow velocities significantly increased in the CRA (PSV from7.53±2.33to8.32±2.51  (p<0.001); EDV from2.16±0.56to2.34±0.55  (p<0.05)) and in the PCAs (PSV from7.18±1.62to7.56±1.55  (p<0.01); EDV from2.48±0.55to2.66±0.6 cm/sec (p<0.01)). The RI of all retrobulbar vessels remained unaffected. Blood pressure and heart rate remained unchanged.Conclusions.Hypervolemic hemodilution has an acute effect on blood flow velocities in the CRA and PCAs in NAION patients. Increased blood flow in the arteries supplying the optic nerve head may lead to a better perfusion in NAION patients. This trial is registered withDRKS00012603.

Doppler Assessment of Human Neonatal Gut Blood Flow Velocities

1992 ◽  
Vol 15 (1) ◽  
pp. 6-12 ◽  
Author(s):  
R. C. Coombs ◽  
M. E. I. Morgan ◽  
G. M. Durbin ◽  
I. W. Booth ◽  
A. S. McNeish
Keyword(s):  
Blood Flow ◽  
Blood Flow Velocities ◽  
Flow Velocities

Longitudinal changes in cerebral blood flow velocities in different clinical courses of migraine

Cephalalgia ◽  
2016 ◽  
Vol 37 (10) ◽  
pp. 927-937 ◽  
Author(s):  
Mi Ji Lee ◽  
Min Kyung Chu ◽  
Hanna Choi ◽  
Hyun Ah Choi ◽  
Chungbin Lee ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebral Artery ◽  
Posterior Cerebral Artery ◽  
Clinical Course ◽  
Episodic Migraine ◽  
Longitudinal Changes ◽  
Blood Flow Velocities ◽  
Headache Clinic ◽  
Flow Velocities

Objective To assess longitudinal changes in cerebral blood flow velocities (ΔCBFVs) according to the clinical course of migraine. Methods We retrospectively included migraine patients with two or more attacks per month at baseline who were followed up within 2 years with transcranial Doppler in a tertiary headache clinic. ΔCBFVs were analyzed in relation to clinical courses, defined as remission (0–1 headache days/month), persistence (2–14/month), or progression (≥15/month) in episodic migraine (EM), and conversion to EM (<15/month) and persistence (≥15/month) in chronic migraine (CM). Results A total of 166 patients (90 EM and 76 CM) were included. In EM, the remission group ( n = 30) showed a decrease in CBFV in the middle cerebral artery (MCA) and the basilar artery (BA). The progression group ( n = 10) showed increasing CBFVs in the bilateral MCAs. Patients with the persistence course ( n = 50) showed generally unchanged CBFVs. In CM, ΔCBFVs decreased in the BA and increased in the posterior cerebral artery (PCA) after conversion to EM ( n = 61), whereas they remained unchanged in the persistence group ( n = 15). In all patients, % change in headache days was positively correlated with the %ΔCBFVs of the bilateral MCAs and the BA. Conclusions CBFV changes are associated with the different clinical courses of migraine. The association is more prominent in EM than CM.

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