Clipping of aneurysm is generally performed as radical surgical therapy for ruptured cerebral aneurysm. In some cases, however, stenosis or occlusion of a parent artery or peripheral artery may occur because of clipping depending upon the shape of the aneurysm and the nature of the pedicle. For such aneurysms, aneurysm clipping is often attempted for angioplasty. For this purpose, the equipment and a system for intraoperative angioplasty are required, and these are not available in some medical facilities. On the other hand, the intraoperative Doppler method using a microprobe is adopted as a simple method, but this is convenient only for observing blood flow and has problems in reproducibility. Further, it is also disadvantageous in that blood flow changes before and after clipping cannot be continuously determined. In the present study, we used an ultrasonic probe with cuff to match the vascular diameter and continuously monitored blood flow velocity and blood flow volume before and after aneurysm clipping in the parent artery and peripheral artery to evaluate the validity of the clipping site. During cerebral aneurysm surgery, the region around the aneurysm was detached. To the arteries peripheral from aneurysm and also to the parent artery, if possible, ultrasonic probe with a cuff matching the outer diameter of the artery was attached, and blood flow velocity and blood flow volume were continuously monitored from immediately before clipping in order to evaluate the influence of clipping. The results of the study revealed that the present method is easy to perform and can quantitatively determine blood flow volume. In particular, it was found to be very useful for fusiform aneurysm or broad neck, which require clipping for angioplasty.
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