comparison of sedative effect of remifentanil with propofol in senile cataract surgery under retrobulbar block

background: because general anesthesia is not a good choice in elderly asa>ii patients candidate for cataract surgery performored by ophthalmology residents and lack of cooperation in these patients, sedative effect and hemodynamic status and side effects of two drugs, remifentanil & propofol  are compared.   methods : in a randomized clinical trial on 60 patients candidate for cataract surgery which were divided in two group each containing 30 patients were compared. in group a (remifentanil group), patients were sedated with a bolus dose of 0.5 µg/kg within 1 minute , and maintenance dose of 0.05 µg/kg/min. in group b ( propofol  group) ,  patients were sedated with a bolus dose of 0.25 µg/kg, and maintenance dose of 25 µg/kg/min. after retrobulbar block was performored for all the patients by residents. hemodynamic responses, including  hr , dbp , sbp  and o2sat and sedation level according to moaa/ss  were measured . modified observers assessment of awareness/sedation scale   =   moaa/ss              results:  sedation was deeper in  group a  (remifentanil ) measured in all times after block and were statistically meaningful (p<0.05) .the heart rate was  reduced in  group a after 20 minutes after block and were statistically meaningful ( p<0.05). 7 cases  in group a ( remifentanil ) had  nausea after drug administration  (p=0.011). conclusion:  remifentanil can induce high level of sedation for patients compare to propofol. but nausea could be troublesome and in this point propofol has less adverse effect.