Evaluation of the Effect of Trendelenburg Position Duration on Intracranial Pressure

optic nerve sheath diameter measurement

The Lloyd Davies position is a position used in laparoscopic hysterectomies where the head is
 lowered 45 degrees and the legs are bent from the knee area.It is a version of the
 Trendelenburg position. Both this position and for laparoscopic surgery carbon dioxide (CO2)
 gas given into the abdomen, causes problems for the patient. Increased abdominal and thoracic
 pressure impairs venous return and increases intracranial pressure. Optic nerve sheath
 diameter can be measured by placing an ultrasound probe over the eye. It is possible to
 follow up the increase in intracranial pressure with this diameter measurement. In this
 study, it was planned to measure the optic nerve sheath diameter by ultrasound in patients
 who will undergo laparoscopic hysterectomy. It is aimed to observe the changes in the
 increase in intracranial pressure as the time lengthens with the measurements to be made at
 certain intervals during the operation. Secondary aim is to determine whether there is a
 cut-off value where the intracranial pressure starts to increase.