Objective To evaluate the changes in blood pressure （BP） of elderly hypertensive patients having dental extraction under sedation with continuous intravenous infusion of midazolam. Methods One hundred elderly hypertensive patients undergoing dental extraction were recruited for this single-blind

randomized

controlled study. Patients in intervention group （n=50） were given midazolam dissolved in glucose solution and patients in control group （n=50） were given glucose solution only with communication technique. Systolic BP （SBP） and diastolic BP （DBP） were recorded in five time points. Results Under basal conditions

intervention group did not show significant difference in BP compared with control group. Before sedation

mean values of SBP and DBP （especially SBP） significantly increased compared with basal conditions in both groups （P<0.05）. During dental extraction sessions

mean values of BP in intervention group significantly decreased than control group （P<0.05）

but coefficient of variation did show significant difference in both groups. Conclusion Continuous intravenous infusion of midazolam has been proved to be very successful in controlling BP of elderly patients having dental extraction.