Effect of Different Fluid Volume on Ocular Parameters in Patients Undergoing Spine Surgery in Prone Position
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Prone Position
- Sponsor
- Huashan Hospital
- Enrollment
- 97
- Locations
- 1
- Primary Endpoint
- The change of intraocular pressure
- Status
- Completed
- Last Updated
- 5 years ago
Overview
Brief Summary
The purpose of this trial is to compare the effect of different fluid volume infusion on ocular parameters in patients undergoing spine surgery in prone position.
Detailed Description
In the prone position, the intraocular pressure and optic nerve sheath diameter increase progressively with time as compared with those in the supine position. Excessive fluid infusion may further increase intraocular pressure and optic nerve sheath diameter. Pulse pressure variation (PPV) is a dynamic index which can effectively assess fluid responsiveness during general anesthesia.Therefore,the investigators have designed a study to compare the effect of different fluid volume infusion guided by low and high PPV indices on intraocular pressure and optic nerve sheath of patients undergoing prone spine surgery with general anesthesia. One group of the patients will receive relatively loose fluid infusion (target value of PPV: 6%-9%),while the other group of the patients will receive limited fluid infusion (target value of PPV: 13%-16%).
Investigators
Xiao-Yu Yang, MD
Principal Investigator
Huashan Hospital
Eligibility Criteria
Inclusion Criteria
- •Scheduled for elective spine surgery in prone position under general anesthesia
- •American Society of Anesthesiologists (ASA) physical status I or II
- •Have signed consent form
Exclusion Criteria
- •History of eye disease or eye surgery
- •Pregnancy or breast feeding
- •Known Allergy to latex or Ringer's lactate solution
- •Hyperlactacidemia，uncontrolled hypertension, diabetes mellitus, arrhythmia, cardiovascular disease，chronic pulmonary disease, swelling of any body part, abnormal of liver or renal function, anemia, etc.
- •Body mass index（BMI）\>30
- •Expected operation time \>6 hours
- •Estimated Intraoperative hemorrhage \>1000ml
- •Taking part in other clinical trials in the last 3 months or at present
Outcomes
Primary Outcomes
The change of intraocular pressure
Time Frame: 10min after anesthesia induction（supine1）, 10min after prone position(prone1), 1 hour after the prone position(prone2), 2 hour after the prone position(prone3),at the end of the surgery(prone4), and 10min after return to the supine position(supine2).
Intraocular pressure will be measured with a TONO-PEN AVIA handheld tonometer.
Secondary Outcomes
- The change of the optic sheath diameter(10min after anesthesia induction（supine1）, 10min after prone position(prone1), 1 hour after the prone position(prone2), 2 hour after the prone position(prone3),at the end of the surgery(prone4), and 10min after return to the supine position(supine2).)