Myopia is the most common refractive error and the subject of interest of various studies assessing ocular blood flow. Increasing refractive error and axial elongation of the eye result in the stretching and thinning of the scleral, choroid, and retinal tissues and the decrease in retinal vessel diameter, disturbing ocular blood flow. Local and systemic factors known to change ocular blood flow...

introduction:amphetamines are central nervous system (cns) stimulant substances and amphetamine abuse is considered a growing problem in our country. previous studies revealed destructive effects of amphetamines on metabolism, perfusion and structure of brain. the aim of current study was evaluating regional cerebral blood flow (rcbf) disturbances in methamphetamine (ma) abusers using brain per...

the purpose of this study was to investigate the potential responses of the cardiovascular system and regional blood flow to hypoxic hypoxia (bb) and to carbon monoxide (co)-induced hypoxia (coh). ten anesthetized cats were studied under two nonnoxic (control: cont) and two hypoxic conditions. four types of radioactive micro spheres were used to measure regional blood flow during cont and two h...

objective: to compare the effectiveness of letrozole and clomiphene citrate (cc) on uterine blood flow rate in patients with unexplained infertility. materials and methods: in this randomized clinical trial 90 women with unexplained infertility referred to a university clinic from january 2011- december 2013 were enrolled. thirty patients were randomized for letrozole, 30 patients for cc and 3o...

PURPOSE To measure total retinal blood flow (TRBF) in normal, healthy Chinese Americans by using semi-automated analysis of Doppler Fourier-domain optical coherence tomography (FD-OCT) scans. METHODS Two hundred sixty-six normal, healthy Chinese-American participants (266 eyes) were enrolled from The Chinese American Eye Study. All participants underwent complete ophthalmic examination, inclu...

Changes in blood flow velocity through the tumors can induce damage of tumor microcirculation and thus may contribute to the final destruction of tumor masses after photodynamic therapy (PDT). The aim of this study was to evaluate the blood flow changes in a SCCVII mouse carcinoma during Photofrin-based photodynamic therapy by analyzing several quantitative spectral Doppler parameters [maximum ...

The mechanisms underlying cerebral vasodilatation during hypercapnia are not fully understood. To examine the role of nerves and prostaglandins in the regulation of basal blood flow and in hypercapnia-induced vasodilatation in the cerebral blood vessels of rabbit.Cerebral blood flow was measured by laser Doppler flow-meter in 18 NZW rabbits anesthetized with sodium pentobarbital.  Tetrodetoxin ...

The severity of coronary arterial stenosis is usually measured by either simple geometrical parameters, such as percent diameter stenosis, or hemodynamically based parameters, such as the fractional flow reserve (FFR) or coronary flow reserve (CFR). The present study aimed to establish a relationship between actual hemodynamic conditions and the parameters that define stenosis severity in the c...

OBJECTIVE To study the relationship between preeclampsia umbilical blood flow changes and the pregnancy outcomes. METHOD The umbilical arterial blood flow parameters including the S/D, pulsatility index (PI), resistance index (RI) and the average birth weight, Apgar score and placental weight changes were analyzed in 106 preeclampsia patients (including 43 mild and 63 severe cases), with 89 w...