Intracranial Doppler Sonography During Surgery
Reports on intracranial Doppler sonographic measurements of blood flow velocity in dissected brain arteries have been rare (Friedrich et al. 1980; Hitchon et al. 1979; Mori take et al. 1980; Nornes et al. 1979; Nornes and Grip 1980). The main reason for this is that commercial instruments and probes were not suited for use on tiny vessels. A high frequency Doppler velocity meter, specially developed for microsurgery with miniaturized and sterilizable probes, now makes it possible to record vessels as small as one-tenth of a millimeter, even in the narrow space at the base of the brain. The method provides a direct, atraumatic, repeatable control of the surgical measures during aneurysm, bypass, and angioma operations on the manipulated vessel itself. Patency, flow direction, and flow disturbances can be assessed on the basis of velocity distribution and changes.
KeywordsLime Neurol Nimodipine Papaverin
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