The accuracy of a carotid back pressure obtained to determine the need for an internal shunt has been questioned. Not all patients undergoing carotid endarterectomy require a carotid shunt while clinically significant cerebral ischemia can be prevented by selective use of a carotid shunt. From July 1977 to January 1980,139 carotid endarterectomies were performed under general anesthesia at norm...

Many diseases are related to cerebrospinal .uid (CSF) hydrodynamics. Therefore, understanding the hydrodynamics of CSF .ow and intracranial pressure is helpful for obtaining deeper knowledge of pathological processes and providing better treatments. Furthermore, engineering a reliable computational method is promising approach for fabricating in vitro models which is essential for inventing gen...

A supersonic separator has been introduced to remove water vapour from natural gas. The mechanisms of the upstream and downstream influences are not well understood for various flow conditions from the wellhead and the back pipelines. We used a computational model to investigate the effect of the inlet and outlet flow conditions on the supersonic separation process. We found that the shock wave...

The back-flow of an aortic valvo-pump will reduce the pumping flow rate but can wash out the gap between the rotor and the stator, and thus can improve the antithrombogenicity of the device. To investigate the regurgitation of a 23mm OD aortic valvo-pump, its closed impeller was replaced by a cylinder and hereby the valvopump had lost its pumping function. The pressure head crossing the aortic ...

This study attempts to search for the combination of the back pressure port size and its location which results in minimum mechanical losses and yet providing sufficient axial sealing. Theoretical study employing a mathematical model coupled with numerical optimisation algorithm predicted that a reduction of 9% in mechanical losses can be achieved. The main cause of gain that resulted in such a...

AIM To investigate the relationship between health locus of control and quality of life in patients with chronic low back pain. MATERIAL AND METHODS Pain intensity by visual analog scale, quality of life related to health by the World Health Organization Quality of Life (WHOQOL) assessment and disability level by Turkish version of Oswestry Disability Index (ODI) were evaluated. Multidimensio...