Abstract
Sequential measurement of internal carotid artery (ICA) stump pressure was performed by the preoperative balloon occlusion test using a wedge pressure balloon catheter in carotid aneurysm unsuitable for direct neck clipping.
Two patterns of the time course of this stump pressure, which diminished by ca. 60%immediately after the balloon inflation, were demonstrated during the balloon occlusion of the ICA.
(i) In the pattern in which the stump pressure was maintained at a low level, gradual occlusion of the ICA would be reasonable.
(ii) In the other pattern, in which the stump pressure was elevated to the level of ca. 70%within five minutes, one-stage occlusion of the ICA would be possible.
