scholarly journals Cold stimulation induces different responses of ophthalmic artery blood flow velocity depending on baseline blood pressure and gender

2009 ◽  
Vol 24 (2) ◽  
pp. 124-133
Author(s):  
G Michelson ◽  
J Harazny ◽  
S Wärntges
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Artery Blood Flow ◽  
Baseline Blood Pressure ◽  
Cold Stimulation ◽  
And Gender

scholarly journals Ophthalmic Artery Blood Flow Velocity in Healthy Term and Preterm Neonates

1988 ◽  
Vol 24 (5) ◽  
pp. 613-616 ◽  
Author(s):  
Wolfgang Lindner ◽  
Michaela Schaumberger ◽  
Hans T Versmold
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Preterm Neonates ◽  
Artery Blood Flow

scholarly journals Fourier Analysis of the Envelope of the Ophthalmic Artery Blood Flow Velocity

Hypertension ◽  
2007 ◽  
Vol 50 (5) ◽  
pp. 964-969 ◽  
Author(s):  
Georg Michelson ◽  
Joanna Harazny ◽  
Roland E. Schmieder ◽  
Rainer Berendes ◽  
Thomas Fiermann ◽  
...  
Keyword(s):  
Blood Flow ◽  
Fourier Analysis ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Artery Blood Flow

Fetal Ophthalmic Artery Blood Flow Velocity Waveforms

1996 ◽  
Vol 41 (4) ◽  
pp. 232-236 ◽  
Author(s):  
Showa Aoki ◽  
Toshiyuki Hata ◽  
Yasuhide Ariyuki ◽  
Daisaku Senoh ◽  
Ken Makihar ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Artery Blood Flow

scholarly journals Ophthalmic artery blood flow velocity increases during hypocapnia

2004 ◽  
Vol 51 (4) ◽  
pp. 388-392 ◽  
Author(s):  
Lorri A. Lee ◽  
Monica S. Vavilala ◽  
Arthur M. Lam ◽  
Colleen Douville ◽  
Anne Moore ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Artery Blood Flow

scholarly journals INFLUENCE OF AGE AND GENDER ON THE STRENGTH OF BLOOD VESSELS

2016 ◽  
Vol 4 ◽  
pp. 719-726
Author(s):  
Zyta Kuzborska
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Blood Vessel ◽  
Flow Velocity ◽  
Blood Vessels ◽  
Blood Flow Velocity ◽  
Vessel Wall ◽  
Blood Vessel Wall ◽  
Critical Stresses ◽  
And Gender

This article examines the effects of cardiovascular diseases that alter the diameter, wall thickness, and length of blood vessels. Depending on form and size of the damage, blood flow velocity, blood pressure, and stresses are affected in areas of diseased blood vessels. Through stimulating the deviations in the geometric shape of a blood-vessel wall, local blood pressure and stresses can arise from flow variation of blood vessels. This rise affects the blood-vessel wall and causes critical stresses likely to produce fissures in the blood vessels. It was found, that blood vessel pathology could cause blood flow velocity to increase up to 2.2 times and local blood pressure up to 3.4 times, and that human aging may have a significant influence on blood-vessel strength.

Root-MUSIC analysis of nitric oxide-mediated changes in ophthalmic artery blood flow velocity waveforms

2009 ◽  
Vol 31 (7) ◽  
pp. 799-805 ◽  
Author(s):  
C.E. Agnew ◽  
D.J. Rea ◽  
A.J. McCann ◽  
C.J. Lockhart ◽  
P.K. Hamilton ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Music Analysis ◽  
Artery Blood Flow

Color Doppler Imaging of Ophthalmic Artery Blood Flow Velocity

Ophthalmology ◽  
1997 ◽  
Vol 104 (4) ◽  
pp. 653-658 ◽  
Author(s):  
Luciano Quaranta ◽  
Alon Harris ◽  
Francesco Donato ◽  
Marta Cassamali ◽  
Francesco Semeraro ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Color Doppler ◽  
Color Doppler Imaging ◽  
Doppler Imaging ◽  
Artery Blood Flow

scholarly journals Variability and Fractal Analysis of Middle Cerebral Artery Blood Flow Velocity and Arterial Blood Pressure in Subarachnoid Hemorrhage

2007 ◽  
Vol 28 (1) ◽  
pp. 64-73 ◽  
Author(s):  
Martin Soehle ◽  
Marek Czosnyka ◽  
Doris A Chatfield ◽  
Andreas Hoeft ◽  
Alonso Peña
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Subarachnoid Hemorrhage ◽  
Middle Cerebral Artery ◽  
Flow Velocity ◽  
Fractal Analysis ◽  
Blood Flow Velocity ◽  
Artery Blood Flow ◽  
Arterial Blood ◽  
Hurst Coefficient

Higher biologic systems operate far from equilibrium resulting in order, complexity, fluctuation of inherent parameters, and dissipation of energy. According to the decomplexification theory, disease is characterized by a loss of system complexity. We analyzed such complexity in patients after subarachnoid hemorrhage (SAH), by applying the standard technique of variability analysis and the novel method of fractal analysis to middle cerebral artery blood flow velocity (FV) and arterial blood pressure (ABP). In 31 SAH –patients, FV (using transcranial Doppler sonography) and direct ABP were measured. The standard deviations (s.d.) and coefficients of variation (CV = relative s.d.) for FV and ABP time series of length 210 secs were calculated as measures of variability. The spectral index βlow and the Hurst coefficient HbdSWV were analyzed as fractal measures. Outcome was assessed 1 year after SAH according to the Glasgow Outcome Scale (GOS). Both FV (βlow = 2.2±0.4, mean±s.d.) and ABP (βlow = 2.3±0.4) were classified as nonstationary (fractal Brownian motion) signals. FV showed significantly ( P <0.05) higher variability (CV = 7.2±2.5%) and Hurst coefficient ( HbdSWV = 0.26±0.13) as compared with ABP (CV = 5.5±2.7%, HbdSWV = 0.19±0.11). Better outcome (GOS) correlated significantly ( P <0.05) with higher s.d. of FV (Spearman's rs = 0.51, rs2 = 0.26) and ABP ( rs = 0.57, rs2 = 0.32), as well as with a higher Hurst coefficient of ABP ( rs = 0.46, rs2 = 0.21). Cerebral vasospasm reduced CV of FV, but left HbdSWV unchanged. FV and ABP fluctuated markedly despite homeostatic control. A reduced variability of FV and ABP might indicate a loss of complexity and was associated with a less favorable outcome. Therefore, the decomplexification theory of illness may apply to SAH.

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