This study is aimed to evaluate how intraocular pressure (IOP) is changed depending on surgical position (Trendelenburg versus reverse Trendelenburg) in the same patient and to compare the effects of different anesthetics on IOP (desflurane versus propofol) in patients undergoing laparoscopic colorectal surgery. The study design is a double-blind randomized controlled trial. The patients were randomly assigned to desflurane or propofol administrated groups and all patient are administered intravenous remifentanil continuously as adjuvant analgesics during anesthesia. For this study 50 to 80-year-old patients undergoing laparoscopic colorectal surgery without eye disease were enrolled. Mean arterial blood pressure, peak airway pressure, end tidal carbon dioxide, and IOP (using a Tono-pen® Avia tonometer) on both eyes were measured at defined intervals during the procedure.
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changes in intraocular pressure (IOP) in different positions during laparoscopic colorectal surgery under desflurane or propofol anesthesia.
Timeframe: before anesthesia induction, immediately after intubation, after pneumoperitoneum, 30 minutes after head down and right tilt position, 10 minutes after head up and right tilt, 30 minutes after head down and right tilt and 5 minutes before extubation