Comparative Evaluation of Two Different Doses of Intravenous Dexmedetomidine Infusion for Sedating Patients Undergoing Lower Abdominal General Surgical Procedures under Spinal Anaesthesia

Subarachnoidblock is a widely used regional anaesthetic technique particularlyadvantageous for lower abdominal surgeries (l).Many spinal and epidural anaesthetic failed because of inadequate intravenous sedation and anxiolysis ratherthan technically flawed blocks .As unsedated patient may be apprehensive anduncooperative to the surgical procedure inspite of having adequate levels ofanalgesia by spinal anesthesia . Patients are often reluctant to remain awake during a procedure and the  requirement to maintain uncomfortablepositioning throughout the  surgery oflong duration can cause spontaneous movements which may interfere with thesurgical procedure. Therefore, provision of adequate sedation is important if the advantages of spinal anaesthesiato be fully appreciated.Theliterature review has few studies to asessthe efficacy of  intravenous ( IV )dexmedetomidine infusion on  spinalanesthesia block characteristics however , there are no studies till date to asessits efficacy on sedation or to evaluate the ideal dose of  IV dexmedetomineinfusion for sedation .Hencethis study has been formulated to compare two different doses of dexmedetomidine infusion to provide  continuous sedation in patients undergoinglower abdominal general surgical procedures under spinal anesthesia