IOP Change Undergoing Anesthesia in Rhesus Macaques (Macaca mulatta) with Laser-Induced Ocular Hypertension

The objective of the study was to examine changes of intraocular pressure (IOP) undergoing anesthesia in Rhesus Macaques (Macaca mulatta) with Laser-induced Ocular Hypertension. Twenty male rhesus macaques (hypertensive glaucoma eye in OD; normal eye in OS) between 6 and 20 years of age were used for the study. The monkeys were anesthetized with ketamine hydrochloride (10 mg/kg intramuscularly) and 1% isoflurane, and then IOP in both eyes was measured by a single investigator using a calibrated Tonopen (TM) applanation tonometer (Mentor, Norwell, MA, U.S.A.). The mean IOP with ketamine anesthesia was 36.70 +/- 12.04 (right eye: OD) and 15.88 +/- 2.84 (left eye: OS). The mean IOP with isoflurane anesthesia was 19.98 +/- 6.67 (right eye: OD) and 15.32 +/- 2.15 (left eye: OS). Undergoing isoflurane anesthesia, the IOP of OD was significantly decreased. Conclusively, careful examination of IOP is required to prevent unexpected contraindication on glaucoma patient with isoflurane anesthesia.