Laparoscopic Gynecologic Surgery Clinical Trial
Randomized,Double-Blind Trial A Comparative Analysis of the Effects of Sevoflurane and Propofol on Optic Nerve Sheath Diameter During Steep Trendelenburg Position and Pneumoperitoneum for Laparoscopic Gynecologic Surgery
|Source||Obstetrics & Gynecology Hospital of Fudan University|
|Status||Enrolling by invitation|
|Phase||Early Phase 1|
|Start date||March 1, 2018|
|Completion date||August 2018|
Intracranial pressure（ICP) increases during laparoscopic gynecologic surgery increase (ICP) and may alter optic nerve sheath diameter(ONSD).This study measures ONSD in different team because sevoflurane and propofol have different effects on ICP.Half of participants will receive sevoflurane anesthesia,while the other half undergo propofol anesthesia.
Due to the anatomical and physiological characteristics of optic nerve sheath ,ONSD increases
when ICP rises.
Sevoflurane and propofol have different effects on ICP.When sevoflurane concentration >1.1 minimum alveolar concentration（MAC),ICP increases because of cerebral vasodilatation；on the other hand ,propofol constricts the blood vessels and ICP decreases.
ICP increases during laparoscopic gynecologic surgery because of steep Trendelenburg position and pneumoperitoneum .
Meanwhile,sevoflurane affects self regulation of cerebral blood flow on the way of dose dependent,but propofol has no effects on self regulation of cerebral blood flow.