The effect of pneumoperitoneum and Trendelenburg position on optic nerve sheath diameter in patients undergoing laparoscopic hysterectomy.

PP and TP in patients undergoing LH. Transorbital sonography is a reliable method to monitor intraoperative changes in ONSDs. This study underlines the need for careful training and the importance of standardization in order to obtain reliable results in the examination technique of ONSD measurements.