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During administration of anesthesia, intraoperative blood pressure control is very important. Sometimes a hypertensive or antihypertensive agent is used in order to maintain blood pressure at an adequate level; α-agonist and β-blocker are drugs frequently used. Alpha-agonists are used in various ways including their application together with local anesthetics during an operation for the purpose of vasoconstriction, to control systemic absorption of local anesthetics, to extend the duration ofdoi:10.4097/kjae.2009.57.2.242 fatcat:gh6357bl4rgwtky4dl6asnjrhi