Objective To observe the effects of isoflurane on ocular hemodynamics .Methods Fifteen patients without eye diseases undergoing non-head and non-neck surgical procedures ,were enrolled in this study. Anesthesia was induced with intravenous propofol and atracuronium, followed by laryngeal mask insertion, and was maintained with isoflurane. Peak systolic velocity(PSV),end diastolic velocity(EDV),Tmax and resistant index(RI) of double ophthalmic arteries, central retinal artery and posterior ciliary arteries were determined by coloured Doppler imaging before anesthesia, 30 min following inhalation of isoflurane 1.0MAC or 1.5MAC respectively . Blood pressure, heart rate and SpO 2 were also measured at above time points.Results As compared with those before anesthesia ,no significant changes were found in all above parameters of double ocular arteries in all time points; PSV and EDV of central retinal artery decreased significantly with increase of isoflurane level(P005); all above parameters of posterior ciliary artery decreased significantly ,with increase of isoflurane level(P005). The diastolic pressure was positively correlated with PSV and EDV of central retinal artery and posterior ciliary arteries ,and negatively with RI , but no correlation to all above parameters of double ophthalmic arteries.Conclusions It may be dangerous for the patients with potential ischemia of eyes undergoing isoflurane anesthesia. Decreasing its concentration and improving blood pressure can increase ocular blood supply to prevent ophthalmic ischemic complications from occurrence.

OBJECTIVE To study the influenceof clonidine on the hemadynamics and plasma catecholamine of the postoperative patients in PACU. METHODS Twenty eight patients suffered from severe OSAHS who underwent modified UPPP and monitored in the PACU after operation were divided randomly into two groups:clonidine group and control group. Both group received the same protocol of sedation and analgesia. Patients in clonidine group received clonidine 3ug/kg injected slowly when entered the PACU,and patients in control group received same volume of NS. Esmolol and Nitroglycerin were used to adjust the hemadynamics. The changing of hemadynamics was recorded,blood samples were taken before operation,2 hours after entering PACU,before discharge from PACU to determine the changing of plasma catecholamine. RESULTS The hemadynamics was more stable in clonidine group than that in control group and less vasoactive agents were needed. The plasma catecholamine was much lower in clonidine group 2 hours after entering PACU and before discharge from PACU than that in control group. CONCLUSION Clonidine could be administered to stabilize the hemadinamics,to lower the level of stress hormone and could improve the recovery of the patients.