introduction: prior studies comparing hemodynamic response function (hrf) in the young and elderly adults based on fmri data have reported inconsistent findings for brain vision and motor regions in healthy aging. it is shown that the averaging method employed in all previous works has caused this inconsistency. the averaging is so sensitive to outliers and noise. however, fmri data are obscure...

introduction: cardiac dysfunctions have been well known in patients with major thalassemia. some studies have focused on differences in blood pressure and heart rate between these patients and normal population, while this view has not been proven in other studies. given the importance of hemodynamic factors in the health of these individuals, we intend to test the hypothesis as to whether or n...

background: etomidate and propofol are common anesthetic agents. previous studies say that etomidate can be used in patients with limited hemodynamic reserve and propofol can lead to more hemodynamic instabilities. th is study was performed to explore the cardiovascular response during the induction of anesthesia with etomidate or for comparison, propofol in elective orthopedic surgeries. mater...

background: although a variety of methods have been suggested to reduce stress, anxiety and pain intensity due to spinal needle skin puncture, their adverse effects restrict theirs widespread administration. in this study we evaluated the effects of oral tizanidine on the reduction of pain caused by spinal needle puncture and hemodynamic responses. methods : in this double blind randomized clin...

background there have been many concerns about alteration in hemodynamic parameters within and shortly after endotracheal intubation (eti) in patients scheduled for elective coronary artery bypass grafting (cabg). objectives we compared the attenuation effect of magnesium sulfate and lidocaine on hemodynamic responses after eti, in patients undergoing cabg. patients and methods in this randomiz...

propofol is a widely used anesthetic drug because of its minor complication and also its fast effect. one of most popular complication in using this drug is pain during injection that is more sever in new generation of its components (lipid-free microemulsion). other complications of propofol are bradycardia and hypotension. this study compares 3 drugs with placebo in control of these complicat...

the pathophysiology of primary benign exertional headache (eh) is not still clearly defined. some researchers have suggested an impaired vascular response as the etiology of this disorder. in this study we investigated whether there are any differences in blood pressure (bp) and heart rate (hr) of the subjects in course of the static and dynamic exercises and the treadmill stress test between t...

patients and methods this was a randomized double-blinded study conducted on 90 patients (18-65 years old, asa i, ii), who needed intubation following trauma. the patients were randomly divided into three groups, group i, group ii and group iii, who have received alfentanil, fentanyl and sufentanil, respectively. heart rate, blood pressure, saturation of peripheral oxygen and end-tidal carbon d...