Titlebook: Neurosurgical Applications of Transcranial Doppler Sonography; Albrecht G. Harders Book 1986 Springer-Verlag/Wien 1986 Bypass.aneurysm.ang

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Vasospasm and Aneurysm Surgery Within 72 Hours After Subarachnoid Hemorrhage, postoperative vasospasm remains a major complication associated with early aneurysm surgery, producing delayed ischemic deficits in about 2–20% of all cases [4, 60, 75, 97, 122, 206]. Until now, the only way to establish the time course of a vasospasm has been by angiography [103, 173, 204].

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Extracranial-intracranial Bypass,y [120], and Doppler sonography [39, 63, 69, 77, 139]. The patency of the anastomosis has been established postoperatively by the Doppler method [69, 76, 77, 83, 89, 193], by rCBF measurements [73, 199] or by angiography.

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Hemodynamic Principles,apply:.the Hagen-Poiseuille law . where I = the volume flow, which is measured in ml/min, ... p = the difference between the pressure at the beginning and at the end of the tube, r = the radius, π = the viscosity of the blood, η= a constant, and L = the length of the tube. The volume flow I = volume

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Prinicples of Ultrasound Doppler Sonography,. The frequency of light and soundwaves is changed if the source and receiver are in motion relative to one another. The frequency increases when the source and receiver approach each other and decreases as they move apart. This physical principle became known as the Doppler effect. Details of the l

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Normal Values,ed into five age groups (10 years each) with five women and five men in each. The patients were placed in a supine position with the head tilted forward about 30°. In three patients (6%), no usable Doppler signals could be registered through the skull. In the remaining cases, frequencies from the pr

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Blood Flow Velocity Changes Under Physiological Deviations,een flow velocity and age (Fig. 13). The results of the measurements showed that the flow velocities were higher among the group of volunteers betweeen 20–30 years of age than in the group of persons between 60 and 70 years of age: in the MCA (3.5) there was a 20% reduction, in the MCA (4.5) 10%, in

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