Overview
The goal of this observational trial is to study the effect of a laryngeal airway mask on the optic nerve sheath diameter, as a surrogate for intracranial pressure.
The optic nerve sheath diameter of participants will be measured under general anesthesia, before, during and after insertion of a laryngeal airway mask.
Eligibility
Inclusion Criteria:
- In order to be eligible to participate in this study, a subject must meet all of the following criteria: aged 18 years or older, ASA I or ASA II, scheduled for elective surgery under general anesthesia, with a planned duration of > 30 minutes, that can be routinely performed with a LMA.
Exclusion Criteria:
- Scheduled for head or neck surgery
- Scheduled for neurosurgery
- Scheduled for laparoscopic or thorascoscopic procedures
- Scheduled for procedures that require Trendelenburg or anti-Trendelenburg positioning
- Neurological disorders
- Glaucoma
- History of bilateral eye related trauma
- Intellectual disability