title: Dexmedetomidine used to provide hypotensive anesthesia during middle ear surgery.
abstract: This study was carried out to assess the hypotensive effect of low dose dexmedetomidine (DEX) infusion during middle ear surgery. 42 ASA grades I and II patients of either sex aged 18-45 years undergoing elective middle ear surgery were randomly divided into two groups of 21 each. Group I received placebo bolus and infusion of saline at a rate similar to DEX in Group II. Group II received 10-15 min prior to induction of anesthesia 1 µg/kg IV bolus DEX diluted in 10 ml of normal saline over 10 min. Immediately thereafter an infusion of 0.4 µg/kg/hr of DEX commenced. Standard anesthetic technique was used. Halothane was titrated to achieve a mean arterial pressure 30% below the control value (value taken just after premedication). We observed that a statistically significant reduction in the percentage of halothane required to reduce MAP 30% below control value occurred in patients receiving DEX infusion (1.3 ± 0.4%) in comparison to those receiving placebo (3.1 ± 0.3%). Patients receiving DEX infusion had a better surgical field. The mean awakening time was significantly reduced in patients of Group II (9.1 ± 2.7 min) when compared to patients of Group I (12.8 ± 2.2 min).We conclude that DEX can be safely used to provide hypotensive anesthesia during middle ear surgery.
authors.affiliation: Department of Anaesthesiology, J. N. Medical College AMU, Aligarh, 202 002 UP India.
authors.forename: Farah
authors.initials: F
authors.lastname: Nasreen
authors.forename: Shahjahan
authors.initials: S
authors.lastname: Bano
authors.forename: Rashid Manzoor
authors.initials: RM
authors.lastname: Khan
authors.forename: Syed Abrar
authors.initials: SA
authors.lastname: Hasan
keywords: Dexmedetomidine; Hypotensive anesthesia; Middle ear surgery