نتایج جستجو برای: hemodynamic change
تعداد نتایج: 622539 فیلتر نتایج به سال:
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...
It is believed that nitroglycerin causes vasodilatation by interacting with sulfhydryl groups present in vascular smooth muscle. This study was performed to assess whether methionine, an amino acid capable of increasing sulfhydryl availability, would potentiate the hemodynamic effects of nitroglycerin. Nitroglycerin was initially infused in incremental doses from 1 to 50 micrograms/min in all p...
Introduction: According to the importance of hemodynamic stability during anesthesia, usage of drugs and technics which change the hemodynamic in a minimum rate has become one of the most important purposes.Widely spread usage of propofol for sedation in cataract surgery made us to evaluate the effect of ketamine,which in itself has sympathetic effects, in usage accompaning with propofol.Materi...
In heart failure patients with preserved ejection fraction, their hemodynamic parameters usually change when they are from recumbent to passive leg raising. The authors designed this study to investigate the relationship between hemodynamic parameters measured by impedance cardiography (ICG) and 6-minute walk distance (6MWD) of heart failure with preserved ejection fraction (HFPEF). We recruite...
BACKGROUND Impedance cardiography (ICG) is a noninvasive method of determining hemodynamic parameters. It is clinically important to determine whether any change in ICG parameters occur due to changes in disease status or therapeutic interventions, or due to normal hemodynamic and technology variability. The objective of this study was to establish the intra- and inter-day reproducibility of IC...
OBJECTIVE Surgical treatment of focal epilepsy in patients with focal cortical dysplasia (FCD) is most successful if all epileptogenic tissue is resected. This may not be evident on structural magnetic resonance imaging (MRI), so intracranial electroencephalography (icEEG) is needed to delineate the seizure onset zone (SOZ). EEG-functional MRI (fMRI) can reveal interictal discharge (IED)-relate...
BACKGROUND Lumbar spine surgery is associated with hemodynamic variations at intubation, change of position, and skin incision. A balanced anesthesia with multimodal analgesia (MMA) is necessary to attenuate these changes. AIM To assess the relative effectiveness of preemptive MMA compared with the conventional analgesic regime in suppressing the hemodynamic response to endotracheal intubatio...
BACKGROUND AND PURPOSE Flow-diverting devices are increasingly being considered for large or giant aneurysms with wide necks, which are difficult to treat with coils or clips. These devices are often oversized to achieve good positioning against the artery wall. The objective of this study was to analyze the effect of oversized flow-diverting devices in altering aneurysmal flows and creating he...
BACKGROUND AND PURPOSE CVR is a measure of cerebral hemodynamic impairment. A recently validated technique quantifies CVR by using a precise CO(2) vasodilatory stimulus and BOLD MR imaging. Our aim was to determine whether preoperative CO(2) BOLD CVR predicts the hemodynamic effect of ECIC bypass surgery in patients with intracranial steno-occlusive disease. MATERIALS AND METHODS Twenty-five ...
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