The intracranial B-waves' amplitude as prognostication criterion of neurological complications in neuroendovascular interventions.

ABSTRACT

The purpose of this study was to evaluate dynamics of B-waves' amplitudes (BWA) of blood flow velocity (BFV) in patients with cerebrovascular diseases during endovascular operations. We examined 12 patients with neurovascular pathology during neuroendovascular interventions. Patients were divided into two groups 1st group (6 cases)--without intraoperative neurological complications, 2nd group (6 cases)--with complications. Bilateral monitoring of BFV in middle cerebral arteries was carried out applying Multi Dop X. To estimate BWA Fourier analysis was used. In the 1st group preoperative BWA on the affected side was 3.9 +/- 0.6 cm/s. Intraoperative (during an access to pathologic formation and its embolisation) BWA increased up to 7.7 +/- 1.1 cm/s (p < 0.05). Postoperative BWA decreased to 4.2 +/- 0.8 cm/s. In the 2nd group the preoperative BWA on the affected side was 9.6 +/- 1.1 cm/s (p < 0.05), thus higher than in the 1st group. Intraoperatively we observed further increase of BWA up to 12.1 +/- 2.6 cm/s, accompanied by occurrence or increase of neurological symptoms. Postoperative BWA decreased to 10.4 +/- 2.9 cm/s, whereas we didn't observe regression of neurological symptoms.