Effect of Internal Jugular Vein Catheterization on Intracranial Pressure and Intracranial Blood Flow

This prospective observational study aims to evaluate the effect of internal jugular vein catheterization on intracranial pressure using optic nerve sheath diameter (ONSD) measurements and carotid artery Doppler ultrasonography in adult patients undergoing surgery under general anesthesia. ONSD will be measured noninvasively using transorbital ultrasonography, and carotid Doppler parameters will be assessed at two time points: after endotracheal intubation and approximately 5 minutes after catheterization. The primary objective is to assess short-term changes in ONSD following catheterization. Secondary objectives include evaluating changes in carotid Doppler measurements and their relationship with ONSD, as well as associations with physiological parameters such as blood pressure, heart rate, oxygen saturation, and end-tidal carbon dioxide.