This study aims to investigate the effect of Sphenopalatine Ganglion Block on ICP and arterio- jugular venous oxygen difference (AJVDO2) and jugular bulb oxygen saturation (SjVO2). Throughout this study, the efficacy of Sphenopalatine Ganglion Block as scalp block in craniotomy operation will be assessed, and the effect of SPGB on cerebral hemostasis during craniotomy will be evaluated by monitoring of both ICP, AJVDO2 and SjVO2.
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Intracranial Pressure
Timeframe: Every 20 minutes until time of initial craniotomy, then again after the dura was sutured.