Change of Optic Nerve Sheath Diameter After Deflation of Pneumatic Tourniquet
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The purpose of this study is to evaluate the change of the optic nerve sheath diameter after deflation of pneumatic tourniquet.
Condition or disease
Intracranial Pressure Increase
Procedure: Deflation of pneumatic tourniquet
Deflation of pneumatic tourniquet could induces many changes in various organ systems. It has been shown to affect intracranial pressure. Thus, the investigators evaluate the change of optic nerve sheath diameter using ultrasound after deflation of pneumatic tourniquet in patients undergoing knee surgery.
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Layout table for eligibility information
Ages Eligible for Study:
18 Years to 79 Years (Adult, Older Adult)
Sexes Eligible for Study:
Patients undergoing knee surgery using pneumatic tourniquet
ASA physical status 1-4
patients undergoing knee surgery using pneumatic tourniquet
patients who refuse to participate in this study
patients with history of cerebrovascular disease
patients who are judged ineligible by the medical staff to participate in the study for other reasons